CN106925317B - A kind of carbon-based catalysis material and its synthetic method - Google Patents

A kind of carbon-based catalysis material and its synthetic method Download PDF

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CN106925317B
CN106925317B CN201511028862.6A CN201511028862A CN106925317B CN 106925317 B CN106925317 B CN 106925317B CN 201511028862 A CN201511028862 A CN 201511028862A CN 106925317 B CN106925317 B CN 106925317B
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based material
weight
peak
amount
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CN106925317A (en
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史春风
于鹏
荣峻峰
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Sinopec Research Institute of Petroleum Processing
China Petroleum and Chemical Corp
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China Petroleum and Chemical Corp
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J27/00Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
    • B01J27/24Nitrogen compounds
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J21/00Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
    • B01J21/18Carbon
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J21/00Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
    • B01J21/18Carbon
    • B01J21/185Carbon nanotubes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J35/00Catalysts, in general, characterised by their form or physical properties
    • B01J35/60Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
    • B01J35/61Surface area
    • B01J35/61310-100 m2/g
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J35/00Catalysts, in general, characterised by their form or physical properties
    • B01J35/60Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
    • B01J35/61Surface area
    • B01J35/615100-500 m2/g
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J37/00Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
    • B01J37/08Heat treatment
    • B01J37/10Heat treatment in the presence of water, e.g. steam
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C5/00Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms
    • C07C5/42Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms by dehydrogenation with a hydrogen acceptor
    • C07C5/48Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms by dehydrogenation with a hydrogen acceptor with oxygen as an acceptor
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C2527/00Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
    • C07C2527/24Nitrogen compounds

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  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
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  • Chemical Kinetics & Catalysis (AREA)
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  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Carbon And Carbon Compounds (AREA)

Abstract

The invention discloses a kind of carbon-based materials, and on the basis of the total weight of the carbon-based material, which contains the metallic element of the carbon of 60-99 weight %, the nitrogen of 0.1-16 weight %, the oxygen element of 0.5-20 weight % and 0.05-8 weight %.The present invention also provides a kind of methods for preparing above-mentioned carbon-based material, and this method comprises the following steps: (1) mixing solid carbon source, presoma and water, obtain mixed material;Wherein, the presoma contains organic alkali source and inorganic alkali source;(2) mixed material is subjected to hydro-thermal process, the material after obtaining hydro-thermal process;And the solid in the material after hydro-thermal process is separated and is dried, the material after being dried;(3) material after drying is roasted.The present invention also provides purposes of the carbon-based material as described above in catalysis oxidation reactions of hydrocarbons.The present invention can improve the selectivity and conversion ratio that hydrocarbon oxidation prepares alkene simultaneously.

Description

A kind of carbon-based catalysis material and its synthetic method
Technical field
The present invention relates to technical field of material chemistry, and in particular, to a kind of carbon-based material, a kind of method for preparing carbon-based material With the purposes of the carbon-based material.
Background technique
Carbon-based material includes carbon nanotube, graphene, fullerene, carbon nano-fiber and Nano diamond etc..Carbon substrate Material can be used as the catalysis material of oxidizing hydrocarbons especially alkane, such as: there are document (Applied Catalysis, 29 (1987) 311-326) reporting becomes styrene for oxidative dehydrogenation of ethylbenzene for catalyst using active carbon, and there are also document (ACTA PHYSICA POLONIC A, 118 (2010) 459-464) to report using active carbon be that normal butane is converted butylene by catalyst And butadiene.
Studies have shown that miscellaneous if modifying oxygen-containing, nitrogen etc. on nano-carbon material (such as carbon nanotubes and graphene) surface The saturation of atom and unsaturation functional group, thus it is possible to vary the catalytic activity of nano-carbon material, it such as can be by nano-carbon material It carries out oxidation processes realization and introduces oxygen atom in nano-carbon material, to increase containing for oxygen-containing functional group in nano-carbon material Amount.For example, can be by nano-carbon material in strong acid (such as HNO3、H2SO4) and/or strong oxidizing solution (such as H2O2、KMnO4) in into Row back flow reaction can also assist carrying out microwave heating or sonic oscillation while back flow reaction, to enhance oxidation reaction Effect.
It may skeleton knot to nano-carbon material but carry out back flow reaction in strong acid and/or strong oxidizing solution Structure has an adverse effect, or even destroys the skeleton structure of nano-carbon material.Such as: nano-carbon material is aoxidized with nitric acid, Although a large amount of oxygen-containing functional groups can be introduced on nano-carbon material surface, easily cause nano-carbon material be cut off and/or The defects of graphite network structure position is obviously increased, so as to reduce the performance of nano-carbon material, such as thermal stability.In addition, By carrying out back flow reaction in strong acid and/or strong oxidizing solution, when introducing oxygen atom, the introduction volume of oxygen atom is to reaction The dependence of operating condition is high, and fluctuation range is wider, is not easy accurately to control.
Alkene especially alkadienes and aromatic olefin are important industrial chemicals, such as butadiene is production synthetic rubber The primary raw material of (such as butadiene-styrene rubber, butadiene rubber, nitrile rubber, neoprene).It is raw using styrene and butadiene copolymer It produces the extensive resin of various uses (such as ABS resin, SBS resin, BS resin and MBS resin), makes butadiene in production of resins Gradually occupy an important position.In addition, butadiene can also be used to produce ethylidene norbornene (EP rubbers Third monomer), Isosorbide-5-Nitrae-fourth Glycol, adiponitrile (nylon66 fiber monomer), sulfolane, anthraquinone and tetrahydrofuran etc., therefore butadiene is also important basic chemical industry Raw material.In addition, styrene is also important the monomer of synthetic rubber and plastics, can be used to produce butadiene-styrene rubber, polystyrene With foamed polystyrene etc.;It is also used for being copolymerized the engineering plastics for manufacturing a variety of different purposes from other monomers.Such as with acrylonitrile, fourth Diene, which is copolymerized, is made ABS resin, is widely used in various household electrical appliance and industrial;It is with SAN resin made from acrylonitrile compolymer Impact resistance, bright in color resin;It is a kind of thermoplastic elastomer with SBS obtained by butadiene copolymer, is widely used as polychlorostyrene second Alkene, polyacrylic modifying agent etc..Styrene is handed over mainly for the production of styrene series resin and butadiene-styrene rubber, and production ion Change one of the raw material of resin and pharmaceuticals.In addition, styrene can also be used in the industries such as pharmacy, dyestuff, pesticide and ore dressing.
Hydrocarbon oxidative dehydrogenation is to prepare the important method of alkene, such as butane oxidation dehydrogenation can be generated 1- butylene, 1- fourth Alkene oxidative dehydrogenation can generate 1,3- butadiene in turn;Vinylbenzene oxidative dehydrogenation can also be generated into styrene.But hydrocarbon oxidation is de- When hydrogen prepares alkene, the problem of improving simultaneously is difficult in the prevalence of selectivity and conversion ratio.
Summary of the invention
The purpose of the present invention is in the presence of overcoming hydrocarbon oxidative dehydrogenation to prepare alkene selectivity and conversion ratio be generally difficult to The problem of improving simultaneously, provide it is a kind of can catalytic hydrocarbon oxidative dehydrogenation prepare alkene and obtain simultaneously highly selective and conversion ratio The purposes of carbon-based material, the preparation method of the carbon-based material and the carbon-based material.
It was found by the inventors of the present invention that carrying out water to carbon source material using the presoma containing organic alkali source and inorganic alkali source Heat treatment is capable of forming to aoxidize with catalytic hydrocarbon and make by the solid separation in the material after hydro-thermal process and after drying and roasting The activity of standby alkene simultaneously obtains highly selective and conversion ratio carbon-based material simultaneously, results in the present invention.
On the one hand, the present invention provides a kind of carbon-based materials, on the basis of the total weight of the carbon-based material, the carbon-based material Carbon containing 60-99 weight %, the nitrogen of 0.1-16 weight %, the oxygen element of 0.5-20 weight % and 0.05-8 weight Measure the metallic element of %;Wherein, the metallic element includes at least one of alkali metal element and/or alkali earth metal, In the x-ray photoelectron spectroscopy of the carbon-based material, the amount and 531.8- of the oxygen element that the peak within the scope of 533.1-533.5eV determines The ratio of the amount for the oxygen element that peak within the scope of 532.2eV determines is in the range of 1-10.
On the other hand, the present invention also provides a kind of method for preparing carbon-based material, this method comprises the following steps: (1) Solid carbon source, presoma and water are mixed, mixed material is obtained;Wherein, the presoma contains organic alkali source and inorganic Alkali source, organic alkali source include machine amine and/or quaternary ammonium base;The inorganic alkali source include metallic element hydroxide and/ Or the salt of the metallic element in alkalinity;The metallic element includes at least one in alkali metal element and/or alkali earth metal Kind;(2) the mixed material for obtaining step (1) carries out hydro-thermal process, the material after obtaining hydro-thermal process;And separate water The solid in material after heat treatment;(3) solid in the material after hydro-thermal process that step (2) obtains is roasted.
On the other hand, the present invention also provides the carbon-based materials that method as described above is prepared.
In another aspect, the present invention also provides the carbon that carbon-based material as described above and method as described above are prepared Purposes of the sill in catalysis oxidation reactions of hydrocarbons.
Through the above technical solutions, the present invention can improve the selectivity and conversion ratio that hydrocarbon oxidation prepares alkene simultaneously.
Other features and advantages of the present invention will the following detailed description will be given in the detailed implementation section.
Specific embodiment
Detailed description of the preferred embodiments below.It should be understood that described herein specific Embodiment is merely to illustrate and explain the present invention, and is not intended to restrict the invention.
The present invention provides a kind of carbon-based materials, and on the basis of the total weight of the carbon-based material, which contains 60- The carbon of 99 weight %, the nitrogen of 0.1-16 weight %, the oxygen element of 0.5-20 weight % and 0.05-8 weight % gold Belong to element, the metallic element includes at least one of alkali metal element and/or alkali earth metal;Wherein, the carbon substrate In the x-ray photoelectron spectroscopy of material, the amount and 531.8-532.2eV of the oxygen element that the peak within the scope of 533.1-533.5eV determines The ratio of the amount for the oxygen element that peak in range determines is in the range of 1-10.
Wherein it is preferred to which the peak within the scope of 533.1-533.5eV determines in the x-ray photoelectron spectroscopy of the carbon-based material Oxygen element amount and 531.8-532.2eV within the scope of peak determine oxygen element amount ratio in the range of 1.2-5.Into One step preferably, in the x-ray photoelectron spectroscopy of the carbon-based material, oxygen element that peak within the scope of 533.1-533.5eV determines Amount and 531.8-532.2eV within the scope of peak determine oxygen element amount ratio in the range of 1.5-2.5.By X-ray The area of O1s spectral peak in photoelectron spectroscopy can determine the total amount of O element in carbon-based material.Wherein, 533.1-533.5eV model The amount for the oxygen element that peak in enclosing determines can indicate the Relative mole content of C-O group, the peak within the scope of 531.8-532.2eV The amount of determining oxygen element can indicate the Relative mole content of C=O group.
In the present invention, in carbon-based material the content of each element be by carbon-based material 300 DEG C at a temperature of in helium atmosphere After middle drying 3 hours, the numerical value measured using X-ray photoelectron spectroscopy, measuring method for known to those skilled in the art, It does not repeat herein.
In the present invention, x-ray photoelectron spectroscopy map refers to that XPS map, XPS map can be normal according to instrument analysis field The method of rule measures to obtain, and the calculating of the amount for the element that peak in x-ray photoelectron spectroscopy in particular range determines can be according to The method of instrument analysis field routine is calculated, such as can be measured according to the specification of x-ray photoelectron spectroscopy And quantitative calculating is carried out using the data software that x-ray photoelectron spectroscopy carries, the present invention does not have particular/special requirement to this.The carbon The x-ray photoelectron spectroscopy data of sill be sample 300 DEG C at a temperature of handle 3h in helium atmosphere after measure. Wherein, when the content value of measurement is lower than 0.1 weight %, the content of the element is denoted as 0.
In the present invention, from the point of view of the catalytic capability for further increasing the carbon-based material, it is preferable that carbon-based with this On the basis of the total weight of material, which contains the carbon of 80-98 weight %, the nitrogen of 0.2-8 weight %, 1-10 The oxygen element of weight % and the metallic element of 0.1-4 weight %.It is highly preferred that the carbon-based material contains the carbon of 85-95 weight % Element, the nitrogen of 0.5-6 weight %, the oxygen element of 3-8 weight % and 0.2-3 weight % metallic element.
In the present invention, it is preferable that the peak in the x-ray photoelectron spectroscopy of the carbon-based material, within the scope of 529.5-530.8eV The amount of determining oxygen element accounts for model of the ratio in 0.01-0.1 of the amount for the oxygen element that the peak within the scope of 526.0-535.0eV determines In enclosing, more preferably in the range of 0.03-0.08.Wherein, the amount base for the oxygen element that the peak within the scope of 529.5-530.8eV determines Originally the Relative mole content of oxygen contained by metal-oxygen key group in carbon-based material can be indicated, within the scope of 526.0-535.0eV The amount for the oxygen element that peak determines can indicate the Relative mole content of oxygen contained by all oxygen-containing groups of carbon-based material substantially.
Carbon-based material according to the present invention, in the x-ray photoelectron spectroscopy of the carbon-based material, 398.0-400.5eV range The ratio of the amount for the nitrogen that the amount for the nitrogen that interior peak determines and the peak within the scope of 395.0-405.0eV determine is in 0.5- In the range of 0.85;More preferably in the range of 0.6-0.75.It can be with by the area of the N1s spectral peak in x-ray photoelectron spectroscopy Determine the total amount of nitrogen in carbon-based material, generally, the amount for the nitrogen that the peak within the scope of 395.0-405.0eV determines is basic It can indicate the Relative mole content of nitrogen contained by whole nitrogen-containing groups in carbon-based material.Wherein, within the scope of 398.0-400.5eV The amount of nitrogen that determines of peak can indicate (such as pyrroles, pyridine, amide and the table of nitrogen contained by NH group in carbon-based material substantially Nitrogen in the amino of face) Relative mole content.
Carbon-based material according to the present invention, in the x-ray photoelectron spectroscopy of the carbon-based material, 400.6-401.5eV range The ratio of the amount for the nitrogen that the amount for the nitrogen that interior peak determines and the peak within the scope of 395.0-405.0eV determine is in 0.15- In the range of 0.5;More preferably in the range of 0.25-0.4.Wherein, the nitrogen that the peak within the scope of 400.6-401.5eV determines Amount can indicate the Relative mole content of contained graphite mould nitrogen in carbon-based material, the peak within the scope of 395.0-405.0eV substantially The amount of determining nitrogen can indicate the Relative mole content of nitrogen contained by whole nitrogen-containing groups of carbon-based material substantially.
Carbon-based material according to the present invention, in the x-ray photoelectron spectroscopy of the carbon-based material, 283.8-284.2eV range The ratio of the amount for the carbon that the amount for the carbon that interior peak determines and the peak within the scope of 280.0-294.0eV determine is in 0.6-1 In the range of;More preferably in the range of 0.7-0.9.Wherein, the amount for the carbon that the peak within the scope of 283.8-284.2eV determines Substantially the Relative mole content of contained graphite mould carbon in carbon-based material can be indicated, the peak within the scope of 280.0-294.0eV determines The amount of carbon can indicate the Relative mole content of carbon contained by whole carbon-containing groups of carbon-based material substantially.
Carbon-based material according to the present invention, in the x-ray photoelectron spectroscopy of the carbon-based material, 286.2-286.6eV range The sum of amount of carbon that the amount for the carbon that interior peak determines and the peak within the scope of 288.6-289.0eV determine and 280.0- The ratio of the amount for the carbon that peak within the scope of 294.0eV determines is in the range of 0.02-0.2;More preferably 0.05-0.15's In range.The total amount of C element in carbon-based material can be determined by the area of the C1s spectral peak in x-ray photoelectron spectroscopy, generally The amount on ground, the carbon that the peak within the scope of 280.0-294.0eV determines can indicate whole carbon-containing groups of carbon-based material substantially The Relative mole content of contained carbon.Wherein, the amount for the carbon that the peak within the scope of 286.2-286.6eV determines can refer to substantially Show the Relative mole content of carbon contained by C-O group in carbon-based material (carbon in such as carboxyl, acid anhydride and ester), 288.6-289.0eV The amount for the carbon that peak in range determines can indicate that carbon contained by C=O group is (in such as hydroxyl and ether in carbon-based material substantially Carbon) Relative mole content.
Carbon-based material according to the present invention, in the x-ray photoelectron spectroscopy of the carbon-based material, 286.2-286.6eV range The ratio of the amount for the carbon that the amount for the carbon that interior peak determines and the peak within the scope of 288.6-289.0eV determine is in 0.3-2 In the range of;More preferably in the range of 0.6-1.7.
In the present invention, position combination as corresponding to the summit at the peak at above-mentioned each peak be can determine that, by mentioned earlier range Determining peak refer to combination corresponding to summit can peak within that range, in the range may include a peak, can also To include more than two peaks.Such as: the peak within the scope of 280.0-294.0eV refers to that combination corresponding to summit can be in Whole peaks in the range of 280.0-294.0eV.
Carbon-based material according to the present invention, wherein the W of the carbon-based material500/W800It can be in the range of 0.02-0.5 It is interior;The W of the preferably described carbon-based material500/W800In the range of 0.05-0.25.Under the preferable case, the carbon-based material Better catalytic effect can be obtained when being used as catalyst, when being especially used as the catalyst of hydrocarbons dehydrogenation reaction, energy Obtain higher feed stock conversion and selectivity of product.Wherein, W800Refer to air atmosphere and 25 DEG C of initial temperature and 10 DEG C/Elevated Temperature Conditions of min under, slip of the carbon-based material in the weight at 800 DEG C relative to the weight at 400 DEG C, i.e., (carbon-based material is in the weight and weight difference of the carbon-based material at 800 DEG C at 400 DEG C)/carbon-based material exists Weight at 400 DEG C, W500Under the Elevated Temperature Conditions for referring to air atmosphere and 25 DEG C of initial temperature and 10 DEG C/min, the carbon Slip of the sill in the weight at 500 DEG C relative to the weight at 400 DEG C, i.e. (weight of the carbon-based material at 400 DEG C Amount is with the carbon-based material in the weight difference at 500 DEG C) the weight of/carbon-based material at 400 DEG C.
Carbon-based material according to the present invention, it is preferable that the distribution of nitrogen therein and oxygen element and metallic element compared with Uniformly.Such as when being analyzed by X-ray microregion element, in the identical different X-ray microcells of the area on the surface of the carbon-based material, nitrogen member The coefficient of variation of the content of element and oxygen element and metallic element is 20% hereinafter, more preferably 15% hereinafter, particularly preferably existing 10% hereinafter, particularly preferably below 5%.Wherein, X-ray microcell refers to selected when carrying out the analysis of X-ray microregion element Observation area.Wherein, the concept of the coefficient of variation refers to the standard deviation of multiple measured values and the percentage of their average, that is, becomes Different coefficient CV=(standard deviation SD/ average value MN) × 100%.Wherein, the method for carrying out the analysis of X-ray microregion element can be according to instrument The method of device analysis field routine measures to obtain, such as specific test method may include: along length with energy depressive spectroscopy in 25- The length direction of carbon-based material such as carbon nanotube in the range of 250nm is scanned, and determines nitrogen-atoms and oxygen atom respectively And concentration or content (measurement 5 concentration or content) of the metallic atom on the length direction, by same nano-carbon material system It is scanned Electronic Speculum-energy spectrum analysis respectively at five effective samples, each sample takes 5 different carbon nanotubes to be scanned, nitrogen Atom and oxygen atom and metallic atom respectively obtain 25 concentration or content data, calculate corresponding nitrogen-atoms and oxygen atom and The coefficient of variation of metallic atom.The coefficient of variation refers to the standard deviation of 25 measured values and the percentage of their average herein, That is coefficient of variation CV=(standard deviation SD/ average value MN) × 100%.In order to preferably reflect the nitrogen in carbon-based material and The distributing homogeneity of oxygen element and metallic element, the area on the surface of selected carbon-based material in the analysis of X-ray microregion element It can be 10-250nm2, preferably 20-200nm2
Wherein, the structural form of the carbon-based material may include carbon nanotube, graphene, fullerene, nano carbon particle, At least one of active carbon, thin layer graphite, carbon nano-fiber and structural form of Nano diamond.
Wherein, the carbon-based material can for carbon nanotube, graphene, fullerene, nano carbon particle, active carbon, One of carbon-based material of thin layer graphite, carbon nano-fiber and nano diamond structure or a variety of mixtures.Wherein, described Carbon-based material, which has, is selected from carbon nanotube, graphene, fullerene, nano carbon particle, active carbon, thin layer graphite, carbon nano-fiber With the structure of Nano diamond.
Wherein it is preferred to which the metallic element includes at least one of lithium, sodium, potassium, rubidium, caesium, magnesium, calcium, strontium and barium.
The present invention also provides a kind of methods for preparing carbon-based material, and this method comprises the following steps: (1) by solid carbon Source, presoma and water mixing, obtain mixed material;Wherein, the presoma contains organic alkali source and inorganic alkali source, described Organic alkali source includes machine amine and/or quaternary ammonium base;The inorganic alkali source include metallic element hydroxide and/or in alkalinity The salt of metallic element;The metallic element includes at least one of alkali metal element and/or alkali earth metal;It (2) will step Suddenly the mixed material that (1) obtains carries out hydro-thermal process, the material after obtaining hydro-thermal process;And after separating hydro-thermal process Solid in material;(3) solid in the material after hydro-thermal process that step (2) obtains is roasted.
According to the method for the present invention, wherein the mixed time and temperature does not have particular/special requirement, can become in a big way Change, such as the mixed time can be 0.5-72h, mixed temperature can be 20-80 DEG C.
According to the method for the present invention, wherein the nitrogen in carbon and organic alkali source in the solid carbon source Molar ratio can be 1:(0.002-50), preferably 1:(0.005-20), more preferably 1:(0.01-10).
According to the method for the present invention, wherein the molar ratio of carbon and the inorganic alkali source in the solid carbon source can Think 1:(0.005-10), preferably 1:(0.008-5), more preferably 1:(0.01-2).
According to the method for the present invention, wherein the weight ratio of carbon and water in the solid carbon source can be 1:(1- 100), preferably 1:(5-20).
According to the method for the present invention, particularly preferably, the presoma also contains hydrogen peroxide, in organic alkali source Nitrogen and the molar ratio of hydrogen peroxide are 1:(0.01-10);It is highly preferred that nitrogen and peroxidating in organic alkali source The molar ratio of hydrogen is 1:(0.05-5).
According to the method for the present invention, wherein hydro-thermal process refers at 100 DEG C or more under air-proof condition at autogenous pressures Holding part water maintains the reaction condition of liquid, and hydro-thermal process can heat water so that part water nature gas under air-proof condition Change pressurization to obtain;Preferably, the temperature for carrying out hydro-thermal process is 105-200 DEG C;More preferably 120-180 DEG C.Wherein, at hydro-thermal The time of reason can be 0.5-96h, preferably 2-72h.
Wherein, the operation of the solid in material after separating hydro-thermal process can be by being centrifuged and/or filtering etc. conventional point It is carried out from mode.
Wherein, after the solid in material after separating hydro-thermal process, solid can be dried, condition is dried It can change in a big way, the condition of the drying is not particularly limited in the present invention, can be conventional selection, preferably Ground, the temperature being dried are 80-180 DEG C, time 0.5-24h.The drying can carry out under normal pressure, can also subtract It is carried out under pressure (i.e. negative pressure).
Wherein, the roasting can carry out in inert atmosphere, can also carry out in oxygen-containing atmosphere, can also be successively It is carried out in inert atmosphere and oxygen-containing atmosphere, wherein the inert atmosphere refers to the atmosphere formed by non-active gas, institute State non-active gas such as group 0 element gas (such as argon gas) and/or nitrogen.Preferably, the roasting is in the gas containing oxygen Middle progress, on the basis of the total volume of the gas containing oxygen, the content of the oxygen in the gas containing oxygen is 2-25 volume %. In order to more convenient and implement the present invention at low cost, under preferable case, the roasting can carry out in air.
Wherein, the condition roasted can change in a big way, such as the temperature of roasting is 200-500 DEG C, excellent It is selected as 300-450 DEG C, the time of roasting is 0.5-48h, preferably 2-24h.The strategy of temperature programming can be used by carrying out roasting Heated, for example, roasting temperature be 200-450 DEG C when, 1-12h is roasted at 200-300 DEG C first, is then existed 1-12h is roasted at 310-450 DEG C;Such as the temperature of roasting be 300-450 DEG C when, roast 1-12h at 300-350 DEG C first, Then 1-12h is roasted at 380-450 DEG C.Wherein, room temperature can be cooled to natural cooling after roasting.
According to the method for the present invention, wherein selecting for the solid carbon source can be the selection of carbon catalytic field routine, only The catalysis aoxidized after the solid carbon source hydrothermal treatment with catalytic hydrocarbon, such as the solid carbon source is wanted to can wrap Include carbon nanotube, graphene, fullerene, nano carbon particle, active carbon, thin layer graphite, carbon nano-fiber and Nano diamond etc. At least one of.Preferably, the solid carbon source includes at least one of carbon nanotube, Nano diamond and graphene.
Wherein, the carbon nanotube may include single-walled carbon nanotube and/or multi-walled carbon nanotube.The carbon nanotube Specific surface area can change in a big way, for example, 20-1000m2/ g, preferably 30-500m2/g.The carbon nanotube can It can also be prepared according to literature method with being commercially available, this is does not repeat known to those skilled in the art herein.
In the case of with the method for the invention it is preferred to, when the solid carbon source is multi-walled carbon nanotube, the multi wall carbon The W of nanotube500/W800It can be in the range of 0.02-0.5;The W of the more preferably described multi-walled carbon nanotube500/W800? In the range of 0.05-0.25.Under the preferable case, the carbon-based material that method of the invention obtains can when being used as catalyst Better catalytic effect is obtained, when being especially used as the catalyst of hydrocarbons dehydrogenation reaction, higher raw material conversion can be obtained Rate and selectivity of product.Wherein, W800Under the Elevated Temperature Conditions for referring to air atmosphere and 25 DEG C of initial temperature and 10 DEG C/min, Slip of the solid carbon source in the weight at 800 DEG C relative to the weight at 400 DEG C, i.e., (solid carbon source is at 400 DEG C Under weight and the solid carbon source in the weight difference at 800 DEG C) the weight of/solid carbon source at 400 DEG C, W500Refer to Under the Elevated Temperature Conditions of air atmosphere and 25 DEG C of initial temperature and 10 DEG C/min, weight of the solid carbon source at 500 DEG C Relative to the slip of the weight at 400 DEG C, i.e., (weight of the solid carbon source at 400 DEG C and the solid carbon source are 500 Weight difference at DEG C) the weight of/solid carbon source at 400 DEG C.
In a kind of more preferably embodiment of the invention, the solid carbon source is multi-walled carbon nanotube, described more The specific surface area of wall carbon nano tube is 50-500m2/ g, preferably 100-400m2/g;The W of the multi-walled carbon nanotube500/W800It can In the range of 0.02-0.5;The W of the more preferably described multi-walled carbon nanotube500/W800In the range of 0.05-0.25.
Wherein, the solid carbon source can also contain oxygen element, nitrogen and remaining nonmetalloid according to source difference (such as phosphorus atoms and sulphur atom), can also be without containing oxygen element, nitrogen and remaining nonmetalloid (such as phosphorus atoms and sulphur original Son).
According to the method for the present invention, when the solid carbon source contains oxygen element, wherein the content of oxygen element is generally not high In 2 weight %, preferably not higher than 0.5 weight %, it is further preferably not higher than 0.2 weight %.
According to the method for the present invention, when the solid carbon source contains nitrogen, wherein the content of nitrogen is generally not high In 0.5 weight %, preferably not higher than 0.2 weight %, it is further preferably not higher than 0.1 weight %.
According to the method for the present invention, when the solid carbon source contains remaining nonmetalloid (such as phosphorus atoms and sulphur atom), Wherein in the solid carbon source oxygen atom and remaining nonmetallic heteroatoms (such as phosphorus atoms and sulphur atom) outside nitrogen-atoms it is total (based on the element) is measured generally not higher than 0.5 weight %, preferably not higher than 0.2 weight %, is further preferably not higher than 0.1 Weight %.
According to the method for the present invention, the organic amine may include aliphatic amine, hydramine, amide, aliphatic cyclic amine and aromatic amine One of or it is a variety of.
In the present invention, the quaternary ammonium base can be various organic level Four ammonium alkali;The aliphatic amine can be NH3In extremely The various compounds that few hydrogen is formed after being replaced by aliphatic alkyl (preferably alkyl);The hydramine can be NH3In The various compounds that at least one hydrogen is formed after being replaced by the aliphatic alkyl (preferably alkyl) of hydroxyl;The amide can be with The compound formed after being replaced for the hydroxyl in carboxylic acid by amino (or amido);The aliphatic cyclic amine can be NH3In at least one The various compounds that a hydrogen is formed after being replaced by cycloalkyl group;The aromatic amine can be NH3In at least one hydrogen it is fragrant The various compounds that alkyl is formed after replacing.
Specifically, the quaternary ammonium base can be quaternary ammonium base shown in formula I, what the aliphatic amine can indicate for Formula II Aliphatic amine, the hydramine can be the hydramine such as formula III expression:
(Formulas I)
In Formulas I, R1、R2、R3And R4Respectively C1-C4Alkyl, C1-C4Alkyl include C1-C4Straight chained alkyl and C3-C4 Branched alkyl, such as: R1、R2、R3And R4It can be respectively methyl, ethyl, n-propyl, isopropyl, normal-butyl, sec-butyl, different Butyl or tert-butyl.
R5(NH2)n(Formula II)
In Formula II, n is an integer of 1 or 2.When n is 1, R5For C1-C6Alkyl, including C1-C6Straight chained alkyl and C3-C6 Branched alkyl, such as methyl, ethyl, n-propyl, isopropyl, normal-butyl, sec-butyl, isobutyl group, tert-butyl, n-pentyl, new penta Base, isopentyl, tertiary pentyl or n-hexyl.When n is 2, R5For C1-C6Alkylidene, including C1-C6Straight-chain alkyl-sub and C3-C6 Branched alkylidene, such as methylene, ethylidene, sub- n-propyl, sub- normal-butyl, sub- n-pentyl or sub- n-hexyl.More preferably fat Race's amine compounds are one of ethamine, n-butylamine, butanediamine and hexamethylene diamine or a variety of.
(HOR6)mNH(3-m)(formula III)
In formula III, m R6It is identical or different, respectively C1-C4Alkylidene, including C1-C4Straight-chain alkyl-sub and C3- C4Branched alkylidene, such as methylene, ethylidene, sub- n-propyl and sub- normal-butyl;M is 1,2 or 3.It is highly preferred that the hydramine Compound is one of monoethanolamine, diethanol amine and triethanolamine or a variety of.
Wherein, the specific example of the aliphatic amine can include but is not limited to ethamine, n-propylamine, n-butylamine, two positive third At least one of amine, butanediamine and hexamethylene diamine.The specific example of the fatty alcohol amine can include but is not limited to monoethanolamine, At least one of diethanol amine and triethanolamine;The specific example of the quaternary ammonium base can include but is not limited to tetramethyl hydrogen-oxygen Change at least one of ammonium, tetraethyl ammonium hydroxide, tetrapropylammonium hydroxide and tetrabutylammonium hydroxide.The amide it is specific Example can include but is not limited to formamide, acetamide, propionamide, butyramide, isobutyramide, acrylamide, polyacrylamide, At least one of caprolactam, dimethylformamide and dimethyl acetamide.The specific example of the aliphatic cyclic amine may include But it is not limited to triethylenediamine, diethylenetriamines, hexa, hexamethylene imine, triethylenediamine, ring second At least one of alkene imines, morpholine, piperazine and cyclohexylamine.The specific example of the aromatic amine can include but is not limited to benzene Amine, diphenylamines, benzidine, o-phenylenediamine, m-phenylene diamine (MPD), p-phenylenediamine, o-toluidine, m-toluidine, open-chain crown ether, 23 dimethyl aniline, 2,4- dimethylaniline, 2,5- dimethylaniline, 2,6- dimethylaniline, 3,4- dimethylaniline, 3, At least one in 5- dimethylaniline, 2,4,6- trimethylaniline, o ethyl aniline, N- butylaniline and 2,6- diethylaniline Kind.
Wherein, the example of the inorganic alkali source can include but is not limited to lithium hydroxide, sodium hydroxide, potassium hydroxide, hydrogen Rubidium oxide, cesium hydroxide, magnesium hydroxide, calcium hydroxide, strontium hydroxide, barium hydroxide, lithium carbonate, sodium carbonate, potassium carbonate, carbonic acid Rubidium, cesium carbonate, calcium bicarbonate, calcium carbonate, magnesium bicarbonate, magnesium carbonate, strontium bicarbonate, strontium carbonate, barium bicarbonate, barium carbonate, carbon At least one of sour hydrogen lithium, sodium bicarbonate, saleratus, rubidium bicarbonate and caesium bicarbonate.
On the other hand, the present invention also provides the carbon-based materials that method as described above is prepared.
Wherein, the carbon-based material that this method obtains can the carbon containing 60-99 weight %, 0.1-16 weight % nitrogen The metallic element of element, the oxygen of 0.5-20 weight % and 0.05-8 weight %, preferably comprise 80-98 weight % carbon, The metallic element of the nitrogen of 0.2-8 weight %, the oxygen element of 1-10 weight % and 0.1-4 weight %, further preferably 85-95 The carbon of weight %, the nitrogen of 0.5-6 weight %, the oxygen element of 3-8 weight % and 0.2-3 weight % metallic element.
Wherein, in the x-ray photoelectron spectroscopy for the carbon-based material that this method obtains, the peak within the scope of 533.1-533.5eV Range of the ratio of the amount for the oxygen element that the amount of determining oxygen element and the peak within the scope of 531.8-532.2eV determine in 1-10 It is interior.
Wherein, in the x-ray photoelectron spectroscopy for the carbon-based material that this method obtains, the peak within the scope of 529.5-530.8eV The amount of determining oxygen element accounts for model of the ratio in 0.01-0.1 of the amount for the oxygen element that the peak within the scope of 526.0-535.0eV determines In enclosing.
Wherein, in the x-ray photoelectron spectroscopy for the carbon-based material that this method obtains, the peak within the scope of 398.0-400.5eV Model of the ratio of the amount for the nitrogen that the amount of determining nitrogen and the peak within the scope of 395.0-405.0eV determine in 0.5-0.85 In enclosing.
Wherein, in the x-ray photoelectron spectroscopy for the carbon-based material that this method obtains, the peak within the scope of 400.6-401.5eV Model of the ratio of the amount for the nitrogen that the amount of determining nitrogen and the peak within the scope of 395.0-405.0eV determine in 0.15-0.5 In enclosing.
Wherein, in the x-ray photoelectron spectroscopy for the carbon-based material that this method obtains, the peak within the scope of 283.8-284.2eV Range of the ratio of the amount for the carbon that the amount of determining carbon and the peak within the scope of 280.0-294.0eV determine in 0.6-1 It is interior.
Wherein, in the x-ray photoelectron spectroscopy for the carbon-based material that this method obtains, the peak within the scope of 286.2-286.6eV The sum of amount of carbon that the amount of determining carbon and the peak within the scope of 288.6-289.0eV determine and 280.0-294.0eV The ratio of the amount for the carbon that peak in range determines is in the range of 0.02-0.2.
Wherein, in the x-ray photoelectron spectroscopy for the carbon-based material that this method obtains, the peak within the scope of 286.2-286.6eV Range of the ratio of the amount for the carbon that the amount of determining carbon and the peak within the scope of 288.6-289.0eV determine in 0.3-2 It is interior.
The carbon-based material obtained according to the method for the present invention, W500/W800It is preferred that more preferably existing in the range of 0.02-0.5 In the range of 0.05-0.25.Better catalytic effect can be obtained in this way, be especially used as the catalysis of hydrocarbons dehydrogenation reaction When agent, higher feed stock conversion and selectivity of product can be obtained.
The carbon-based material obtained according to the method for the present invention, the distribution of nitrogen therein and oxygen element and metallic element compared with Uniformly.Such as when being analyzed by X-ray microregion element, in the identical different X-ray microcells of the area on the surface of the carbon-based material, nitrogen member The coefficient of variation of the content of element and oxygen element and metallic element is below 20%.Wherein, X-ray microcell refers to micro- in progress X-ray P-block element p observation area selected when analyzing.Wherein, the concept of the coefficient of variation refer to multiple measured values standard deviation and they Average percentage, i.e. coefficient of variation CV=(standard deviation SD/ average value MN) × 100%.Wherein, X-ray microcell member is carried out The method of element analysis can measure to obtain according to the method for instrument analysis field routine, such as specific test method may include: The length direction of carbon-based material such as carbon nanotube with energy depressive spectroscopy along length in the range of 25-250nm is scanned, Determine that (5 concentration of measurement contain the concentration or content of nitrogen-atoms and oxygen atom and metallic atom on the length direction respectively Amount), five effective samples are made by same nano-carbon material and are scanned Electronic Speculum-energy spectrum analysis respectively, each sample take 5 not It is scanned with carbon nanotube, nitrogen-atoms and oxygen atom and metallic atom respectively obtain 25 concentration or content data, calculate The coefficient of variation of corresponding nitrogen-atoms and oxygen atom and metallic atom.Herein the coefficient of variation refer to the standard deviations of 25 measured values with The percentage of their average, i.e. coefficient of variation CV=(standard deviation SD/ average value MN) × 100%.In order to preferably reflect The distributing homogeneity of nitrogen in carbon-based material and oxygen element and metallic element out, it is selected in the analysis of X-ray microregion element The area on surface of carbon-based material can be 10-250nm2, preferably 20-200nm2
Wherein, it includes this hair that method of the invention, which obtains having the possible cause of the carbon-based material of above-mentioned pathognomonic feature parameter, It is that the treatment processes such as hydro-thermal and roasting are combined under specific material variety and material proportion in bright method.
The structural form of the carbon-based material obtained according to the method for the present invention may include carbon nanotube, graphene, fullerene, At least one of nano carbon particle, active carbon, thin layer graphite, carbon nano-fiber and structural form of Nano diamond.
In another aspect, the purposes the present invention also provides carbon-based material as described above in catalysis oxidation reactions of hydrocarbons.
Wherein, the carbon atom number of the hydrocarbon can be 2-15, and the hydrocarbon includes alkane, alkene and the aromatic hydrocarbon containing alkyl At least one of;The alkyl contains at least two carbon atoms.Preferably, the hydrocarbon includes butane, 1- butylene, ethylbenzene, third At least one of alkane, ethane and pentane.
Wherein, carbon-based material as described above can use in oxidation reactions of hydrocarbons as catalyst, and have higher Hydrocarbon catalyticing oxidation performance.
Wherein, the condition of oxidation reactions of hydrocarbons can be the process conditions of low-carbon alkanes catalytic oxidation routine, such as react Temperature can be 200-650 DEG C, preferably 300-600 DEG C, more preferably 350-550 DEG C are still more preferably 400-450 DEG C, it can be 0.05-80MPa, preferably 0.1-40MPa, more preferably 0.1-20MPa that the pressure of reaction, which can be pressure, more Further preferably 0.1-5MPa, the concentration of hydrocarbon can be 1-30 volume %, preferably 1-10 volume %, mole of hydrocarbon and oxygen Than that can be (0.1-10): 1, preferably (0.2-5): 1, it, can also be containing other to carry in raw material in addition to containing hydrocarbon and oxygen The balanced gas that gas form introduces, wherein carrier gas can contain nitrogen, group 0 element gas (such as argon gas), CO2With vapor etc. At least one of.The duration of the reaction can be selected according to the temperature of contact, can use the gas of charging Volume space velocity come indicate reaction duration.Generally, the volume space velocity of the gas of charging can be 0.1-10000h-1, excellent It is selected as 1-6000h-1, more preferably 5-5000h-1, further preferably 10-4000h-1
Present invention be described in more detail by the following examples.In following embodiment and comparative example, if not otherwise specified, Used reagent is commercially available analytical reagents.Wherein, the phosphorus content without containing oxygen element carbon nanotube is greater than 96 weights % is measured, ash content is less than 1.5 weight %, specific surface area 168m2/ g is purchased from Chengdu Organical Chemical Co., Ltd., Chinese Academy of Sciences. Phosphorus content containing oxygen element carbon nanotube is greater than 95 weight %, and oxygen element content is 1.1 weight %, and ash content is less than 1.2 weights Measure %, specific surface area 211m2/ g is purchased from Chengdu Organical Chemical Co., Ltd., Chinese Academy of Sciences.The phosphorus content of graphene is greater than 99 weight %, ash content is less than 0.8 weight %, specific surface area 627m2/ g is purchased from the limited public affairs of Chinese Academy of Sciences Chengdu organic chemistry Department.
In following embodiment and comparative example, X-ray photoelectron spectroscopic analysis is in Thermo Scientific company It is carried out on ESCALab250 type x-ray photoelectron spectroscopy.Excitaton source be monochromatization Al K α X-ray, energy 1486.6eV, Power is 150W.Penetrating used in narrow scan can be 30eV.Base vacuum when analysis test is 6.5 × 10-10mbar.Electronics knot Closing can be corrected with the peak C1s (284.0eV) of simple substance carbon.The Thermo that Correlation method for data processing is carried in x-ray photoelectron spectroscopy It carries out on Avantage software, version number V5.926, is carried out in analysis module using sensitivity factor method known to industry It is quantitative to wait analysis.
In following embodiment and comparative example, thermogravimetric analysis carries out on TA5000 thermal analyzer, and test condition is air gas Atmosphere, heating rate are 10 DEG C/min, and temperature range is 25 DEG C to 1000 DEG C.
In following embodiment and comparative example, using the ASAP2000 type N of Micromertrics company, the U.S.2Physical absorption Instrument measurement the specific area.
In following embodiment and comparative example, using the scanning electron microscope equipped with energy depressive spectroscopy (component), (Dutch PHILIPS is public Take charge of 30 ESEM type scanning electron microscope of XL) measure nano-carbon material (by taking carbon nanotube as an example) surface nitrogen atom and oxygen atom And the distributing homogeneity of metallic atom, specific test method are as follows: use energy depressive spectroscopy along length in the range of 25-250nm The length direction of carbon nanotube be scanned, determine nitrogen-atoms and oxygen atom and metallic atom on the length direction respectively Concentration (measurement 5 concentration), five effective samples be made by same nano-carbon material be scanned Electronic Speculum-power spectrum respectively and divide Analysis, each sample take 5 different carbon nanotubes to be scanned, nitrogen-atoms and oxygen atom and metallic atom respectively obtain 25 it is dense Degree evidence calculates the coefficient of variation of corresponding nitrogen-atoms and oxygen atom and metallic atom.The coefficient of variation refers to 25 measurements herein The percentage of the standard deviation of value and their average, i.e. coefficient of variation CV=(standard deviation SD/ average value MN) × 100%.
Embodiment 1
Under room temperature (25 DEG C), by solid carbon source (carbon nanotube without containing oxygen element), presoma (tetrapropylammonium hydroxide And sodium hydroxide) and water be stirred 2h, obtain mixed material, wherein the carbon in the solid carbon source and 4 third The molar ratio of nitrogen in base ammonium hydroxide is 1:0.1, and the molar ratio of the solid carbon source and sodium hydroxide is 1:0.5, institute The weight ratio for stating solid carbon source and water is 1:10;Mixed material obtained above is placed in polytetrafluoroethyllining lining Seal autoclave in, in 140 DEG C at autogenous pressures hydro-thermal process for 24 hours, by the solid mistake in the material after hydro-thermal process Filter is separated and is dried, and dry temperature is 120 DEG C, until the solid being separated by filtration is kept substantially constant weight (drying Time be 6h), the material after being dried, then by the material after obtained drying under 330 DEG C of maturing temperature, in sky 2h is roasted in gas, then under 430 DEG C of maturing temperature, roasts 2h in air, obtains the carbon-based material of the present embodiment.
Embodiment 2
Under room temperature (25 DEG C), by solid carbon source (carbon nanotube without containing oxygen element), presoma (tetramethylammonium hydroxide And potassium hydroxide) and water be stirred 1h, obtain mixed material, wherein carbon and tetramethyl in the solid carbon source The molar ratio of nitrogen in base ammonium hydroxide is 1:0.05, and the molar ratio of the solid carbon source and potassium hydroxide is 1:0.01, The solid carbon source and the weight ratio of water are 1:5, and mixed material obtained above is placed in polytetrafluoroethyllining lining Sealing autoclave in, in 180 DEG C at autogenous pressures hydro-thermal process for 24 hours, by the solid in the material after hydro-thermal process It is separated by filtration and is dried, dry temperature is 120 DEG C, until the solid being separated by filtration is kept substantially constant weight and (does The dry time is 6h), the material after being dried, then by the material after obtained drying under 300 DEG C of maturing temperature, 2h is roasted in air, then under 400 DEG C of maturing temperature, roasts 2h in air, obtains the carbon-based material of the present embodiment.
Embodiment 3
Under room temperature (25 DEG C), by solid carbon source (carbon nanotube without containing oxygen element), presoma (tetraethyl ammonium hydroxide And calcium hydroxide) and water be stirred 3h, obtain mixed material, wherein carbon and tetrem in the solid carbon source The molar ratio of nitrogen in base ammonium hydroxide is 1:5, and the molar ratio of the solid carbon source and calcium hydroxide is 1:2, described solid Body carbon source and the weight ratio of water are 1:20;Mixed material obtained above is placed in the sealing with polytetrafluoroethyllining lining In autoclave, in 120 DEG C of hydro-thermal process 48h at autogenous pressures, by the solid filtering point in the material after hydro-thermal process From and be dried, dry temperature is 120 DEG C, until the solid that is separated by filtration is kept substantially constant weight (when dry Between be 6h), the material after being dried, then by the material after obtained drying under 350 DEG C of maturing temperature, in air Roasting 2h roasts 2h then under 450 DEG C of maturing temperature in air, obtains the carbon-based material of the present embodiment.
Embodiment 4
Under room temperature (25 DEG C), by solid carbon source (carbon nanotube without containing oxygen element), presoma (tetrapropylammonium hydroxide And sodium hydroxide) and water be stirred 5h, obtain mixed material, wherein the carbon in the solid carbon source and 4 third The molar ratio of nitrogen in base ammonium hydroxide is 1:0.002, and the molar ratio of the solid carbon source and sodium hydroxide is 1: 0.005, the weight ratio of the solid carbon source and water is 1:2;Mixed material obtained above is placed in polytetrafluoroethyl-ne It, will be in the material after hydro-thermal process in 180 DEG C of hydro-thermal process 12h at autogenous pressures in the sealing autoclave of alkene liner Solid be separated by filtration and be dried, dry temperature is 120 DEG C, until the solid that is separated by filtration is kept substantially perseverance It weighs (the dry time is 6h), the material after being dried, then the maturing temperature by the material after obtained drying at 330 DEG C Under, 2h is roasted in air, then under 380 DEG C of maturing temperature, roasts 2h in air, obtains the carbon substrate of the present embodiment Material.
Embodiment 5
Under room temperature (25 DEG C), by solid carbon source (carbon nanotube without containing oxygen element), presoma (tetrapropylammonium hydroxide And sodium hydroxide) and water be stirred 6h, obtain mixed material, wherein the carbon in the solid carbon source and 4 third The molar ratio of nitrogen in base ammonium hydroxide is 1:50, and the molar ratio of the solid carbon source and sodium hydroxide is 1:10, described Solid carbon source and the weight ratio of water are 1:100;Mixed material obtained above is placed in polytetrafluoroethyllining lining Seal autoclave in, in 150 DEG C at autogenous pressures hydro-thermal process for 24 hours, by the solid mistake in the material after hydro-thermal process Filter is separated and is dried, and dry temperature is 120 DEG C, until the solid being separated by filtration is kept substantially constant weight (drying Time be 6h), the material after being dried, then by the material after obtained drying under 350 DEG C of maturing temperature, in sky 2h is roasted in gas, then under 450 DEG C of maturing temperature, roasts 2h in air, obtains the carbon-based material of the present embodiment.
Embodiment 6
Carbon-based material is prepared using the method with embodiment 1, unlike, the temperature of hydro-thermal process is 105 DEG C.
Embodiment 7
Carbon-based material is prepared using the method with embodiment 1, unlike, the temperature of hydro-thermal process is 195 DEG C.
Embodiment 8
Carbon-based material is prepared using the method with embodiment 1, unlike, tetrapropylammonium hydroxide is replaced with into hexamethylene diamine With the equal weight mixtures of n-butylamine, sodium hydroxide is replaced with into sodium carbonate.
Embodiment 9
Carbon-based material is prepared using the method with embodiment 1, unlike, tetrapropylammonium hydroxide is replaced with into diethanol The equal weight mixtures of amine and aniline, replace with calcium bicarbonate for sodium hydroxide.
Embodiment 10
Carbon-based material is prepared using the method with embodiment 1, unlike carbon nanotube is replaced with etc. to the graphite of weight Alkene.
Embodiment 11
Carbon-based material is prepared using the method with embodiment 1, unlike, the material after obtained drying is at 330 DEG C Under maturing temperature, 4h is roasted in air.
Embodiment 12
Carbon-based material is prepared using the method with embodiment 1, unlike, the material after obtained drying is at 430 DEG C Under maturing temperature, 4h is roasted in air.
Embodiment 13
Carbon-based material is prepared using the method with embodiment 1, unlike, the material after obtained drying is at 500 DEG C Under maturing temperature, 1h is roasted in air.
Embodiment 14
Carbon-based material is prepared using the method with embodiment 1, unlike, the material after obtained drying is at 210 DEG C Under maturing temperature, 4h is roasted in air.
Embodiment 15
Carbon-based material is prepared using the method with embodiment 1, unlike, solid carbon source is the carbon nanometer containing oxygen element Pipe, roasting carry out in argon gas.
Embodiment 16
Carbon-based material is prepared using the method with embodiment 1, unlike, solid carbon source is the carbon nanometer containing oxygen element Pipe, roasting carry out in air.
Embodiment 17
Carbon-based material is prepared using the method with embodiment 1, unlike, roasting carries out in nitrogen.
Embodiment 18
Carbon-based material is prepared using the method with embodiment 1, unlike, the presoma also contains hydrogen peroxide, Middle tetrapropylammonium hydroxide and the molar ratio of hydrogen peroxide are 1:0.1.
Embodiment 19
Carbon-based material is prepared using the method with embodiment 10, unlike, the presoma also contains hydrogen peroxide, Middle tetrapropylammonium hydroxide and the molar ratio of hydrogen peroxide are 1:1.
Embodiment 20
Carbon-based material is prepared using the method with embodiment 15, unlike, the presoma also contains hydrogen peroxide, Middle tetrapropylammonium hydroxide and the molar ratio of hydrogen peroxide are 1:2.
Comparative example 1
By solid carbon source (carbon nanotube without containing oxygen element), presoma (tetrapropylammonium hydroxide and sodium hydroxide) and 12h is mixed under water normal temperature and pressure, obtains mixed material, wherein carbon and tetrapropyl hydrogen-oxygen in the solid carbon source Change the molar ratio of the nitrogen in ammonium as 1:0.1, the molar ratio of the solid carbon source and sodium hydroxide is 1:0.5, the solid Carbon source and the weight ratio of water are 1:10;Mixed material obtained above is dried, dry temperature is 120 DEG C, directly It is kept substantially constant weight (the dry time is 6h) to the solid being separated by filtration, then the material after being dried is incited somebody to action Material after the drying arrived roasts 2h under 330 DEG C of maturing temperature in air, then under 430 DEG C of maturing temperature, 2h is roasted in air, using the material after roasting as the carbon-based material of this comparative example.
Comparative example 2
Under room temperature (25 DEG C), by solid carbon source (carbon nanotube without containing oxygen element), presoma (tetrapropylammonium hydroxide And sodium hydroxide) and water be stirred 6h, obtain mixed material, wherein the carbon in the solid carbon source and 4 third The molar ratio of nitrogen in base ammonium hydroxide is 1:0.1, and the molar ratio of the solid carbon source and sodium hydroxide is 1:0.5, will Mixed material obtained above is placed in the sealing autoclave with polytetrafluoroethyllining lining, in 140 DEG C spontaneous Solid in material after hydro-thermal process is separated by filtration and is dried by hydro-thermal process 24 hours under pressure, dry temperature It is 120 DEG C, until the solid being separated by filtration is kept substantially constant weight (the dry time is 6h), the object after being dried Material, then using the material after obtained drying as the carbon-based material of this comparative example.
Testing example 1
The side of method or reference in reference literature (Jian Zhang et al., Science 322 (2008), 73-77) Method, buy to the obtained carbon-based material of embodiment 1-20 and comparative example 1-2 and as described above containing/receive without containing oxygen element carbon Mitron carries out elemental analysis and XPS atlas analysis.Wherein, be in x-ray photoelectron spectroscopy 300 DEG C at a temperature of in helium It is measured after processing 3h in atmosphere.The results are shown in Table 1.
In table 1, XPS map column O1 indicate 533.1-533.5eV within the scope of peak determine oxygen element amount with The ratio of the amount for the oxygen element that peak within the scope of 531.8-532.2eV determines;O2 is indicated by 529.5- in x-ray photoelectron spectroscopy The amount for the oxygen element that peak within the scope of 530.8eV determines accounts for the amount for the oxygen element that the peak within the scope of 526.0-535.0eV determines Ratio × 100 (percent value).The C1 of XPS map column indicates the amount for the carbon that the peak within the scope of 283.8-284.2eV determines Ratio × 100 (percent value) of the amount of the carbon determined with the peak within the scope of 280.0-294.0eV;C2 indicates 286.2- The amount for the carbon that the amount for the carbon that peak within the scope of 286.6eV determines and the peak within the scope of 288.6-289.0eV determine it With amount × 100 (percent value) of the carbon determined with the peak within the scope of 280.0-294.0eV;C3 refers to 286.2-286.6eV The ratio of the amount for the carbon that the amount for the carbon that peak in range determines and the peak within the scope of 288.6-289.0eV determine.XPS The amount and the peak within the scope of 395.0-405.0eV that the N1 of map column refers to the nitrogen that the peak within the scope of 398.0-400.5eV determines Ratio × 100 (percent value) of the amount of determining nitrogen;N2 refers to the nitrogen that the peak within the scope of 400.6-401.5eV determines Amount and 395.0-405.0eV within the scope of peak determine nitrogen amount ratio × 100 (percent value).W indicates W500/W800 × 100 (percent values).C, N, O and the M of element group in column respectively indicate the element composition of carbon, nitrogen, oxygen and metal.CV was indicated When X-ray microregion element is analyzed, in the identical different X-ray microcells of the area on the surface of the carbon-based material, nitrogen and oxygen element with And the coefficient of variation of the content of metallic element, wherein the M of CV column indicates the coefficient of variation of metal element content.
Table 1
Can be seen that according to the analysis test data of embodiment 1-20 in table 1 and comparative example 1-2 may be due to having carried out water Heat and roasting so that in the XPS map of carbon-based material, the amount for the oxygen element that the peak within the scope of 533.1-533.5eV determines with The ratio of the amount for the oxygen element that peak within the scope of 531.8-532.2eV determines is in the range of 1-10;By 529.5-530.8eV model The ratio of the amount for the oxygen element that the peak that the amount for the oxygen element that peak in enclosing determines accounts within the scope of 526.0-535.0eV determines exists In the range of 0.01-0.1;Within the scope of the amount and 395.0-405.0eV of the nitrogen that peak within the scope of 398.0-400.5eV determines Peak determine nitrogen amount ratio in the range of 0.5-0.85;400.6-401.5eV the nitrogen that the peak in range determines The ratio of the amount for the nitrogen that the amount of element and the peak within the scope of 395.0-405.0eV determine is in the range of 0.15-0.5; The carbon that the amount for the carbon that peak within the scope of 283.8-284.2eV determines and the peak within the scope of 280.0-294.0eV determine Amount ratio in the range of 0.6-1;The amount and 288.6- for the carbon that peak within the scope of 286.2-286.6eV determines The carbon that the sum of the amount of carbon that peak within the scope of 289.0eV determines is determined with the peak within the scope of 280.0-294.0eV The ratio of amount is in the range of 0.02-0.2;The amount and 288.6- for the carbon that peak within the scope of 286.2-286.6eV determines The ratio of the amount for the carbon that peak within the scope of 289.0eV determines is in the range of 0.3-2;W500/W800For 0.02-0.5;Area In identical difference X-ray microcell, the coefficient of variation of the content of nitrogen and oxygen element and metallic element is below 20%.
Testing example 2
That buys respectively by the obtained carbon-based material of the embodiment 1-20 of 0.25g and comparative example 1-2 and as described above contains Oxygen element carbon nanotube and without containing oxygen element carbon nanotube as catalyst, be loaded into universal fixed bed miniature quartz pipe In reactor, two end seal of miniature quartz pipe reactor has quartz sand, under the conditions of normal pressure and 420 DEG C, by the material (volume of butane Concentration is 1.98%, and butane and oxygen molar ratio 2:3, Balance Air is nitrogen) total volume air speed be 1000h-1Under reacted, instead It answers after 8h according to the method in document (322 (2008) 73-77 of Jian Zhang et al., Science), measures conversion of butane Rate, butadiene selective and total olefin selectivity, the results are shown in Table 2.
Table 2
According to the data of table 2, it is found that the carbon-based material that the present invention obtains can improve hydrocarbon oxygen as catalyst simultaneously Fluidized dehydrogenation prepares the selectivity and conversion ratio of alkene.Contain carbon, the 0.5-8 weight of 80-98 weight % in preferred carbon-based material Measure nitrogen, the oxygen element of 1-10 weight % and the metallic element of 0.1-4 weight % of %, the X-ray photoelectricity of the carbon-based material In sub- power spectrum, the amount for the oxygen element that the peak within the scope of 533.1-533.5eV determines and the peak within the scope of 531.8-532.2eV are determined Oxygen element amount ratio in the range of 1.2-5 in the case where, further can improve hydrocarbon oxidative dehydrogenation simultaneously and prepare alkene The selectivity and conversion ratio of hydrocarbon.Also, in the temperature of preferred hydro-thermal process be 120-180 DEG C and maturing temperature is 300-450 DEG C In the case where, selectivity and conversion ratio that oxidative dehydrogenation prepares alkene can be further improved simultaneously.Meanwhile containing in presoma When hydrogen peroxide, the selectivity of conversion ratio and alkene can be further improved.
The preferred embodiment of the present invention has been described above in detail, still, during present invention is not limited to the embodiments described above Detail within the scope of the technical concept of the present invention can be with various simple variants of the technical solution of the present invention are made, this A little simple variants all belong to the scope of protection of the present invention.
It is further to note that specific technical features described in the above specific embodiments, in not lance In the case where shield, can be combined in any appropriate way, in order to avoid unnecessary repetition, the present invention to it is various can No further explanation will be given for the combination of energy.
In addition, various embodiments of the present invention can be combined randomly, as long as it is without prejudice to originally The thought of invention, it should also be regarded as the disclosure of the present invention.

Claims (22)

1. a kind of carbon-based material, it is characterised in that: on the basis of the total weight of the carbon-based material, which contains 60-99 The carbon of weight %, the nitrogen of 0.1-16 weight %, the oxygen element of 0.5-20 weight % and 0.05-8 weight % metal Element;Wherein, the metallic element includes at least one of alkali metal element and/or alkali earth metal, the carbon-based material X-ray photoelectron spectroscopy in, the amount and 531.8-532.2eV model of the oxygen element that peak within the scope of 533.1-533.5eV determines The ratio of the amount for the oxygen element that interior peak determines is enclosed in the range of 1-10, the nitrogen that the peak within the scope of 398.0-400.5eV determines The ratio of the amount for the nitrogen that the amount of element and the peak within the scope of 395.0-405.0eV determine is in the range of 0.5-0.85.
2. carbon-based material according to claim 1, wherein on the basis of the total weight of the carbon-based material, the carbon-based material Carbon containing 80-98 weight %, the nitrogen of 0.2-8 weight %, the oxygen element of 1-10 weight % and 0.1-4 weight % Metallic element, in the x-ray photoelectron spectroscopy of the carbon-based material, oxygen element that the peak within the scope of 533.1-533.5eV determines The ratio of the amount for the oxygen element that amount is determined with the peak within the scope of 531.8-532.2eV is in the range of 1.2-5.
3. carbon-based material according to claim 2, wherein the carbon-based material contains the carbon of 85-95 weight %, 0.5- The metallic element of the nitrogen of 6 weight %, the oxygen element of 3-8 weight % and 0.2-3 weight %, the X-ray light of the carbon-based material In electron spectrum, the amount for the oxygen element that the peak within the scope of 533.1-533.5eV determines and the peak within the scope of 531.8-532.2eV are true The ratio of the amount of fixed oxygen element is in the range of 1.5-2.5.
4. carbon-based material described in any one of -3 according to claim 1, wherein the x-ray photoelectron energy of the carbon-based material In spectrum, the amount for the oxygen element that the peak within the scope of 529.5-530.8eV determines accounts for the oxygen that the peak within the scope of 526.0-535.0eV determines The ratio of the amount of element is in the range of 0.01-0.1.
5. carbon-based material described in any one of -3 according to claim 1, wherein the x-ray photoelectron of the carbon-based material In power spectrum, what the amount for the nitrogen that the peak within the scope of 400.6-401.5eV determines was determined with the peak within the scope of 395.0-405.0eV The ratio of the amount of nitrogen is in the range of 0.15-0.5.
6. any one of -3 carbon-based material stated according to claim 1, wherein the x-ray photoelectron spectroscopy of the carbon-based material In, the carbon that amount and the peak within the scope of 280.0-294.0eV of the carbon that the peak within the scope of 283.8-284.2eV determines determine is first The ratio of the amount of element is in the range of 0.6-1;The amount and 288.6- for the carbon that peak within the scope of 286.2-286.6eV determines The carbon that the sum of the amount of carbon that peak within the scope of 289.0eV determines is determined with the peak within the scope of 280.0-294.0eV The ratio of amount is in the range of 0.02-0.2;The amount and 288.6- for the carbon that peak within the scope of 286.2-286.6eV determines The ratio of the amount for the carbon that peak within the scope of 289.0eV determines is in the range of 0.3-2.
7. carbon-based material described in any one of -3 according to claim 1, wherein the area phase on the surface of the carbon-based material In same different X-ray microcells, the coefficient of variation of the content of nitrogen and oxygen element and metallic element each comfortable 20% or less.
8. carbon-based material described in any one of -3 according to claim 1, wherein the W of the carbon-based material500/W800? In the range of 0.02-0.5;Wherein, W800Refer to the Elevated Temperature Conditions of air atmosphere and 25 DEG C of initial temperature and 10 DEG C/min Under, slip of the carbon-based material in the weight at 800 DEG C relative to the weight at 400 DEG C, W500Refer to air atmosphere and 25 DEG C initial temperature and 10 DEG C/min Elevated Temperature Conditions under, the carbon-based material is in the weight at 500 DEG C relative at 400 DEG C Weight slip.
9. carbon-based material described in any one of -3 according to claim 1, wherein the structural form of the carbon-based material includes carbon The structure of nanotube, graphene, fullerene, nano carbon particle, active carbon, thin layer graphite, carbon nano-fiber and Nano diamond At least one of form;The metallic element includes at least one of lithium, sodium, potassium, rubidium, caesium, magnesium, calcium, strontium and barium.
10. a kind of method for preparing carbon-based material described in any one of claim 1-9, it is characterised in that: this method packet Include following steps:
(1) solid carbon source, presoma and water are mixed, obtains mixed material;Wherein, the presoma contains organic alkali source With inorganic alkali source, organic alkali source includes machine amine and/or quaternary ammonium base;The inorganic alkali source includes the hydroxide of metallic element The salt of object and/or the metallic element in alkalinity;The metallic element include in alkali metal element and/or alkali earth metal extremely Few one kind;
(2) the mixed material for obtaining step (1) carries out hydro-thermal process, the material after obtaining hydro-thermal process;And it separates The solid in material after hydro-thermal process;
(3) solid in the material after hydro-thermal process that step (2) obtains is roasted.
11. according to the method described in claim 10, wherein, in the carbon and organic alkali source in the solid carbon source The molar ratio of nitrogen is 1:(0.002-50);The molar ratio of carbon and the inorganic alkali source in the solid carbon source is 1: (0.005-10);The weight ratio of carbon and water in the solid carbon source is 1:(1-100).
12. method described in 0 or 11 according to claim 1, wherein carbon and organic alkali source in the solid carbon source In nitrogen molar ratio be 1:(0.01-10);The molar ratio of carbon and the inorganic alkali source in the solid carbon source For 1:(0.01-2);The weight ratio of carbon and water in the solid carbon source is 1:(5-20).
13. according to the method described in claim 10, wherein, the presoma also contains hydrogen peroxide, in organic alkali source Nitrogen and hydrogen peroxide molar ratio be 1:(0.01-10).
14. according to the method described in claim 10, wherein, the temperature for carrying out hydro-thermal process is 105-200 DEG C;It carries out at hydro-thermal The time of reason is 0.5-96h;The temperature of roasting is 200-500 DEG C, and the time of roasting is 0.5-48h.
15. according to the method for claim 14, wherein the temperature for carrying out hydro-thermal process is 120-180 DEG C;The temperature of roasting It is 300-450 DEG C.
16. according to the method described in claim 10, wherein, roasting carries out in the gas containing oxygen, to contain oxygen On the basis of the total volume of gas, the content of the oxygen in the gas containing oxygen is 2-25 volume %.
17. according to the method described in claim 10, wherein, the solid carbon source be selected from carbon nanotube, graphene, fullerene, At least one of nano carbon particle, thin layer graphite, active carbon, carbon nano-fiber and Nano diamond.
18. according to the method described in claim 10, wherein, the organic amine includes aliphatic amine, hydramine, amide, aliphatic cyclic amine At least one of with aromatic amine;The aliphatic amine be selected from ethamine, n-propylamine, n-butylamine, di-n-propylamine, butanediamine and oneself two At least one of amine;The hydramine is selected from least one of monoethanolamine, diethanol amine and triethanolamine;The quaternary ammonium base Selected from least one of tetramethylammonium hydroxide, tetraethyl ammonium hydroxide, tetrapropylammonium hydroxide and tetrabutylammonium hydroxide; The amide is selected from formamide, acetamide, propionamide, butyramide, isobutyramide, acrylamide, polyacrylamide, acyl in oneself At least one of amine, dimethylformamide and dimethyl acetamide;The aliphatic cyclic amine is selected from triethylenediamine, diethylidene In triamine, hexa, hexamethylene imine, triethylenediamine, cyclic ethylene imines, morpholine, piperazine and cyclohexylamine It is at least one;The aromatic amine is selected from aniline, diphenylamines, benzidine, o-phenylenediamine, m-phenylene diamine (MPD), p-phenylenediamine, o-methyl-benzene Amine, m-toluidine, open-chain crown ether, 23 dimethyl aniline, 2,4- dimethylaniline, 2,5- dimethylaniline, 2,6- bis- Methylaniline, 3,4- dimethylaniline, 3,5- dimethylaniline, 2,4,6- trimethylaniline, o ethyl aniline, N- butylaniline At least one of with 2,6- diethylaniline;Wherein, the inorganic alkali source include lithium hydroxide, sodium hydroxide, potassium hydroxide, Rubidium hydroxide, cesium hydroxide, magnesium hydroxide, calcium hydroxide, strontium hydroxide, barium hydroxide, lithium carbonate, sodium carbonate, potassium carbonate, carbon At least one of sour rubidium, cesium carbonate, lithium bicarbonate, sodium bicarbonate, saleratus, rubidium bicarbonate and caesium bicarbonate.
19. the carbon-based material that method described in any one of claim 10-18 is prepared.
20. purposes of the carbon-based material described in any one of claim 1-9 and 19 in catalysis oxidation reactions of hydrocarbons.
21. purposes according to claim 20, wherein the carbon atom number of the hydrocarbon is 2-15, and the hydrocarbon includes alkane, alkene At least one of hydrocarbon and the aromatic hydrocarbon containing alkyl;The alkyl contains at least two carbon atoms.
22. purposes according to claim 21, wherein the hydrocarbon includes butane, 1- butylene, ethylbenzene, propane, ethane and penta At least one of alkane.
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