CN108079999A - A kind of method of continuous producing carbon nano-tube poly-metal deoxide pore space structure catalyst - Google Patents

A kind of method of continuous producing carbon nano-tube poly-metal deoxide pore space structure catalyst Download PDF

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CN108079999A
CN108079999A CN201711278563.7A CN201711278563A CN108079999A CN 108079999 A CN108079999 A CN 108079999A CN 201711278563 A CN201711278563 A CN 201711278563A CN 108079999 A CN108079999 A CN 108079999A
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reaction
metal salt
poly
space structure
pore space
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李岩
耿磊
吕振华
王哲
王莲莲
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SHANDONG DAZHAN NANO MATERIALS CO Ltd
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SHANDONG DAZHAN NANO MATERIALS CO Ltd
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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
    • B01J37/00Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
    • B01J37/02Impregnation, coating or precipitation
    • B01J37/03Precipitation; Co-precipitation
    • B01J37/031Precipitation
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/70Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
    • B01J23/76Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
    • B01J23/84Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
    • B01J23/85Chromium, molybdenum or tungsten
    • B01J23/88Molybdenum
    • B01J23/881Molybdenum and iron
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/70Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
    • B01J23/76Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
    • B01J23/84Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
    • B01J23/85Chromium, molybdenum or tungsten
    • B01J23/88Molybdenum
    • B01J23/882Molybdenum and cobalt
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/70Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
    • B01J23/76Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
    • B01J23/84Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
    • B01J23/85Chromium, molybdenum or tungsten
    • B01J23/88Molybdenum
    • B01J23/887Molybdenum containing in addition other metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
    • B01J23/8872Alkali or alkaline earth metals
    • B01J35/40
    • B01J35/60
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    • 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
    • B01J37/04Mixing
    • 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B82NANOTECHNOLOGY
    • B82YSPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y30/00Nanotechnology for materials or surface science, e.g. nanocomposites
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B2202/00Structure or properties of carbon nanotubes
    • C01B2202/06Multi-walled nanotubes
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B2202/00Structure or properties of carbon nanotubes
    • C01B2202/20Nanotubes characterized by their properties
    • C01B2202/36Diameter
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01PINDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00Particle morphology
    • C01P2004/01Particle morphology depicted by an image
    • C01P2004/03Particle morphology depicted by an image obtained by SEM

Abstract

The present invention relates to the technical fields of the synthesis of multi-metal-oxide catalyst used in carbon nanotubes, the method of specially a kind of continuous producing carbon nano-tube poly-metal deoxide pore space structure catalyst, by the way that micro passage reaction continuous producing carbon nano-tube poly-metal deoxide pore space structure catalyst will not be used after homogeneous raw material preparation solution.The aqueous slkali of active metal salt solution and inert metal salt is continuously pumped into micro passage reaction, under certain condition, precipitation reaction is carried out in micro passage reaction and prepares presoma, reactant is filtered, washs, is dry, roasting, obtaining poly-metal deoxide hole catalyst after screening.Current traditional handicraft is compared, greatly improves the stability and uniformity of production catalyst, yield is improved;The expense of solvent is greatly reduced in reaction process, it is more environmentally-friendly;Its carbon nanotubes Diameter distribution being catalyzed is concentrated, and indices collimation is good, improves the competitiveness of product in market.

Description

A kind of continuous producing carbon nano-tube poly-metal deoxide pore space structure catalyst Method
Technical field
The present invention relates to the technical fields of the synthesis of multi-metal-oxide catalyst used in carbon nanotubes, are specially a kind of company The continuous method for preparing carbon nanotubes poly-metal deoxide pore space structure catalyst, by that will not be adopted after homogeneous raw material preparation solution With micro passage reaction continuous producing carbon nano-tube poly-metal deoxide pore space structure catalyst.
Background technology
Micro passage reaction has obvious advantage in terms of mass transfer, heat exchange, can strengthen mixing and accurate temperature controlling, also The cycle of craft screening and technique amplification can be greatly shortened.Miniature chemical industry equipment have it is simple in structure, without enlarge-effect, operation Condition is easily controllable and the advantages that intrinsic safety, causes the very big concern of numerous researchers.
Carbon nanotubes has excellent physical mechanical property, mainly has hexagonal row as monodimension nanometer material The carbon atom of row forms several layers to tens of layers of coaxial pipe.It has very big draw ratio, diameter usually 1-100nm it Between, length is at a few micrometers to hundreds of microns.Just because of its big draw ratio, carbon nanotubes is in mechanics, electricity, electrical and thermal conductivity Energy aspect all shows very excellent.Since it is with excellent performance, carbon nanotubes is in catalyst carrier, rubber plastic composite wood The numerous areas such as material, electrochemical material, photoelectric sensing all have wide, potential application prospect.
Carbon nanotubes carry out catalytic chemistry vapor phase deposition catalysts technology of preparing, be all traditionally coprecipitation and Gel method.Wherein coprecipitation is artificial or form control flow velocity is added dropwise in metering pump, can not accurately be controlled, obtained forerunner Body product is uneven, and lot stability is slightly poor, and obtained catalyst granules and yield uniformity is poor, the carbon nanometer that final production goes out Pipe Diameter distribution is wide, and specific surface area gap is big.
Patent CN201510671278.6《It is a kind of continuously to prepare sea urchin shape Ag-ZnO nano-particles using micro passage reaction Method》, a kind of method that sea urchin shape Ag-ZnO nano-particles are continuously prepared using micro passage reaction of the disclosure of the invention.Tool Body is will be by AgNO3, sodium citrate, lauryl sodium sulfate, H2O2The mixed solution of composition with by NaBH4With NaOH compositions Mixed solution is passed through micro passage reaction simultaneously, is reacted under certain temperature and residence time, and reaction mass should from microchannel plate After device outlet outflow, being directly entered capillary microreactor, the reaction was continued, generates monodisperse Silver nanodisks.The monodisperse silver nanoparticle Disk is directly entered a micro passage reaction with 3 entrances, the microchannel plate after capillary microreactor outlet outflow Other two entrance of device is answered to each lead into Zn (NO3)2Solution and NaOH solution, reaction mass are flowed out from micro passage reaction Afterwards, aging is carried out at a certain temperature, and sea urchin shape Ag-ZnO nano-particles are finally prepared.
Patent CN201620272546.7,《A kind of micro passage reaction for producing nanometer sulfate》Disclose a kind of production The micro passage reaction of nanometer sulfate, belongs to chemical reaction device technical field.The micro passage reaction of the patent passes through three The setting of layer structure and reaction of high order unit enables to charging more accurate, and reaction mass mixing is more uniform, overcomes feed liquid The laminar flow phenomenon occurred in the reaction process that clashes makes reaction be more nearly plume state, and reaction process contact is more abundant, reaction More thoroughly, the nanometer sulfate of head-on collision reaction generation can effectively be avoided to reunite again, product is made to keep nano shape and grain size Uniformly, so be made high quality nanometer sulfate product.
Patent CN201510158737.0《A kind of method that copper zinc catalyst is prepared using micro passage reaction》It discloses A kind of method that copper zinc catalyst is prepared using micro passage reaction, the process for preparing the catalyst are in micro passage reaction Middle progress, the micro passage reaction at least possess two entrances and corresponding mixing section, and the equivalent diameter of mixing section exists 0.01-5mm.The invention solves the problems, such as that nucleus is easily reunited during coprecipitation preparation, is easy to get smaller to large specific surface area, grain size Catalyst crystal grain.
Patent CN201410108682.8《A kind of side for preparing nano-titanium dioxide with the precipitation method using microreactor Method》A kind of method for preparing nano-titanium dioxide with the precipitation method using microreactor is disclosed, by the inorganic matter nothing of titaniferous Water-ethanol dissolves, then that the ethanol solution of the aqueous solution of inorganic base and titaniferous inorganic matter is pumped into microchannel moduleization simultaneously respectively is anti- It answers in device, keeps residence time 15s-1min, reacted at room temperature, reaction product is centrifuged, precipitation distillation washing It washs 3 times, and it is dry in vacuum desiccator, then 600 DEG C of roasting 2h in Muffle furnace, obtain final products nano-titanium dioxide.
Patent CN201310690832.6《A kind of method that micro passage reaction prepares carbonate form nano hydrotalcite》It is public A kind of preparation method of carbonate form nano hydrotalcite is opened.The invention uses coprecipitation, by mixed salt solution and contains The mixed ammonium/alkali solutions for having carbonate are continuously passed through micro passage reaction after heat exchange, under certain temperature in micro passage reaction It carries out precipitation reaction and hydrotalcite precursor is prepared, then by precursor pulp through follow-up aging or hydro-thermal process, and wash dry It is dry to obtain carbonate form hydrotalcite product.
Above-mentioned patent, which concentrates on, continuously prepares basic chemical industry raw material, single substance nano particle and sheet metal oxygen The fields such as compound there is no the pore space structure catalyst for the catalyzing carbon nanotube that a new generation is prepared using microchannel reaction technology at present Precedent and report, the present invention compensate for this blanking technique and method, and accurate continuous producing carbon nano-tube is catalyzed with pore space structure Agent.
The content of the invention
For carbon nano-tube catalyst industry Situation at present both at home and abroad, it is more to provide a kind of continuous producing carbon nano-tube use The method of metal oxide hole structure catalyst makes up its continuous batch precision system for carbon nanotubes pore space structure catalyst Technological gap.Using micro passage reaction, reaction raw materials reach being mixed for micron even Nano grade, react abundant ring Guarantor is efficient, and the catalyst granules prepared is homogeneous, active site is evenly distributed, and catalytic activity is stablized, and carbon nanotubes production is greatly improved The quality and the market competitiveness of product.
Pore space structure catalyst of the present invention, the poly-metal deoxide pore space structure for catalyzing carbon nanotube growth are urged Agent.The method is continuous preparation method, including successive soln charging and the discharging of continuous nozzle.
The technical scheme is that:
A kind of method of continuous producing carbon nano-tube poly-metal deoxide pore space structure catalyst, by active metal salt and go from Sub- water is configured to active metal salt solution and inert metal salt and is configured to the aqueous slkali of inert metal salt with lye to be continuously pumped into Reaction member under certain condition, carries out precipitation reaction and prepares presoma in the reaction cell, and reactant is filtered, washing, dry It obtains preparing carbon nanotubes poly-metal deoxide pore space structure catalyst after dry, roasting, screening.
A kind of continuous producing carbon nano-tube method of poly-metal deoxide pore space structure catalyst, is as follows, Including:
(1)Active metal salt and deionized water are configured to solution A, and A liquid is active metal salt solution, mass fraction 5%-60%;
(2)Inert metal salt and Alkali liquid compounding are into solution B, and B liquid is the aqueous slkali of inert metal salt, mass fraction 2%-60%;
(3)A and B solution are continuously delivered continuously to reaction member by accurate measurement pump, and the flow volume ratio of wherein A and B are A:B =0.7-1.5:1;
(4)Reaction temperature is 15 DEG C -80 DEG C, reaction pressure 0.05Mpa-0.2Mpa, and material carries out in micro passage reaction Reaction, the residence time is in 3-8s, then continuous ejection;
(5)Material is filtered, washing, and overnight, 350-700 DEG C of roasting, screening obtains product for 70-150 DEG C of drying.
The features of the present invention also has:
The step(3)Reaction member for micro passage reaction, micro passage reaction for covering 1nm-50mm single channel, One or more combinations in multichannel, Parallel Unit, the parallel system of highly dense, micro passage reaction material are carbonization Silicon ceramics, glass, quartz, stainless steel, Hastelloy or graphite.
The active metal salt is the one or more of iron, nickel, cobalt, manganese, platinum, aluminium, the nitrate of magnesium or sulfate, The mass fraction of active metal salt solution is preferably 20%-50%;The high active metal salt solution reaction rate of concentration faster, is reduced The volume of reaction system, short preparation period, but excessively high rear precipitate speed is accelerated, easy blocking pipeline, the present invention rationally control Active metal salt solution concentration processed.
Inert metal salt is ammonium molybdate, the one or more of ammonium carbonate;Lye for sodium hydroxide or ammonium hydroxide it is a kind of or Person mixes;The preferred 5%-50% of mass fraction of the aqueous slkali of inert metal salt, the high active metal salt solution reaction rate of concentration Faster, the volume of reaction system, short preparation period are reduced, but excessively high rear precipitate speed is accelerated, easy blocking pipeline, this hair The concentration of the aqueous slkali of bright reasonable control inert metal salt.
The flow volume ratio of the active metal salt solution and inert metal salting liquid is 0.7:1 - 1.5:1, be preferably 0.9-1.3:1, further preferably 1:1, rational usage ratio so that two kinds of solution of A and B mix more uniform stabilization.
The step(5)Drying temperature for 100-120 DEG C, calcination temperature is 400 DEG C -600 DEG C;Drying temperature is in 100- During 120 DEG C of sections, drying efficiency is faster and the material hardness of generation is moderate;Calcination temperature can ensure to imitate at 400-600 DEG C The active site section of narrow distribution is obtained on the premise of rate.
The beneficial effects of the invention are as follows:
The present invention can reach accurate control pH value in reaction by the flow of fine adjustments two kinds of solution of A and B, be accurate to 0.01;(PH is a passive index parameter, is what is realized by adjusting the flow-rate ratio of AB);By the residence time for controlling reaction 3-8s realizes that catalyst granules is evenly distributed, and specific surface area of catalyst and micropore data are uniform, and uniformity is strong, obtained catalysis Agent yield multiplying power has 30% raising than before.
The data target of the multi-walled carbon nanotube prepared is catalyzed, including Diameter distribution, heap density, SSA, volume resistivity etc. Lot stability is good.
In short, the accurate control of the invention by that can reach pH to the conversion of different flow, compares current traditional work Skill, greatly improves the stability and uniformity of production catalyst, and yield is improved;Solvent is greatly reduced in reaction process Expense, it is more environmentally-friendly;Its carbon nanotubes Diameter distribution being catalyzed is concentrated, and indices collimation is good, improves product The market competitiveness.
Description of the drawings
Hole catalyst prepared by Fig. 1 present invention;
Catalyst granules figure prepared by Fig. 2 present invention;
Carbon nanotubes SEM pictures prepared by Fig. 3 conventional methods synthesis Fe-series catalyst(It is distributed caliber 8.98-30.6nm);
Carbon nanotubes SEM pictures prepared by Fig. 4 present invention synthesis Fe-series catalysts(It is distributed caliber 12.9-23.2nm);
Carbon nanotubes SEM pictures prepared by Fig. 5 present invention synthesis nickel catalysts(It is distributed caliber 14.1-27.7nm).
Specific embodiment
Below in conjunction with the content in the embodiment of the present invention, apparent and completion is carried out to technical scheme and is explained It states.Obviously, described embodiment is only the part of the embodiment of the present invention, and is not whole experiment case studies.It is based on The embodiment of the present invention.Remaining embodiment that those skilled in the art are obtained, all belong to the scope of protection of the present invention within.
Embodiment 1:In the present embodiment, Fe-series catalyst is prepared using the method for the present invention.Formula is as follows:
A active metal salt solutions
Nine water aluminum nitrate 1350g, nine water ferric nitrate 610g, deionized water 4000g;The deionization of 4000g is added in 10L beakers Water, successively adds in the nine water aluminum nitrates of 1350g and the nine water ferric nitrates of 610g, and heating mantle is warming up to 50 DEG C -55 DEG C, uses glass bar It is spare after stirring to dissolved clarification.
The aqueous slkali of B inert metal salt
Four water ammonium heptamolybdate 40g, ammonium carbonate 550g, 17% ammonium hydroxide 190g, deionized water 3500g.
Preparation method:The deionized water of 3500g is added in 10L beakers, successively adds in the ammonium carbonate of 550g and four water of 40g Ammonium heptamolybdate, heating mantle are warming up to 40 DEG C -50 DEG C, are stirred with glass bar to dissolved clarification, add in 17% ammonium hydroxide of 190g, and stirring is equal It is spare after even.
Concrete operations are:
Using Shanghai Tauto Biotechnology Co., Ltd. TBP2H02S type constant-flux pumps, by active metal salt solution A and inertia Metal saline solution B is continuously passed through the MCT of Guizhou Micro Technology Co., Ltd. with 105ml/min and 90ml/min flows respectively Micro-mixer, 32 DEG C, pressure 0.2Mpa of controlling reaction temperature, material continuously spray at nozzle;Product carries out centrifugal filtration, uses It is neutrality that deionized water, which is beaten to pH, and 110 DEG C of drying 10-12h, 450 DEG C of roasting 2h select 80-100 mesh to be urged for qualification after screening Agent is weighed as 315g.
Carry out the catalysis of multi-walled carbon nanotube with it, a diameter of 50mm, length be 1400mm quartzy fluid bed in into Row reaction, feed intake 2g, after hydrogen reducing, controls 680-690 DEG C of temperature, is passed through propylene:Nitrogen is 1000:The gas of 2000ml/min Body 50min obtains multi-walled carbon nanotube product 87.3g;Its SEM picture is shown in attached drawing 4.
Embodiment 2 prepares nickel catalyst in the present embodiment, using the present invention.Formula is as follows:
A active metal salt solutions
Six water nickel nitrate 275g,
Magnesium nitrate hexahydrate 230g,
Deionized water 790g.
The deionized water of 790g is added in 2L beakers, successively adds in the six water nickel nitrates of 275g and the six water nitric acid of 230g Magnesium, heating mantle are warming up to 50 DEG C -55 DEG C, spare after being stirred with glass bar to dissolved clarification.
The aqueous slkali of B inert metal salt
Four water ammonium heptamolybdate 19g,
Ammonium carbonate 350g,
17% ammonium hydroxide 120g,
Deionized water 680g.
Preparation method:The deionized water of 680g is added in 2L beakers, successively adds in the ammonium carbonate of 350g and four water seven of 19g Ammonium molybdate, heating mantle are warming up to 40 DEG C -50 DEG C, are stirred with glass bar to dissolved clarification, add in 17% ammonium hydroxide of 120g, stir evenly It is spare afterwards.
Concrete operations are:
Using Shanghai Tauto Biotechnology Co., Ltd. TBP1H02S type constant-flux pumps, by active metal salt solution A and inertia The aqueous slkali B of metal salt is continuously passed through the MCT of Guizhou Micro Technology Co., Ltd. with 45ml/min and 55ml/min flows respectively Micro-mixer, 41 DEG C, pressure 0.15Mpa of controlling reaction temperature, material continuously spray at nozzle;Product carries out centrifugal filtration, It is neutral to be beaten with deionized water to pH, and 110 DEG C of drying 8-9h, 550 DEG C of roasting 3h select 80-100 mesh to be urged for qualification after screening Agent is weighed as 104g.
Carry out the catalysis of multi-walled carbon nanotube with it, a diameter of 50mm, length be 1600mm quartzy fluid bed in into Row reaction, feed intake 1g, after hydrogen reducing, controls 650-670 DEG C of temperature, is passed through propylene:Nitrogen is 1200:The gas of 1800ml/min Body 60min obtains multi-walled carbon nanotube product 52.2g;Its SEM picture is shown in attached drawing 5.
Embodiment 3:In the present embodiment, cobalt series catalyst is prepared using traditional manual control dropwise addition.Formula is as follows:
A active metal salt solutions
Nine water aluminum nitrate 675g, cobalt nitrate hexahydrate 458g, deionized water 1900g.
Preparation method:The deionized water of 1900g is added in 5L beakers, successively adds in the nine water aluminum nitrates and 458g of 675g Cobalt nitrate hexahydrate, heating mantle are warming up to 55 DEG C -60 DEG C, spare after being stirred with glass bar to dissolved clarification.
The aqueous slkali of B inert metal salt
Four water ammonium heptamolybdate 18g, ammonium carbonate 300g, 17% ammonium hydroxide 100g, deionized water 1800g.Preparation method:Add in 5L beakers Enter the deionized water of 1800g, successively add in the ammonium carbonate of 300g and the four water ammonium heptamolybdates of 18g, heating mantle is warming up to 55 DEG C -60 DEG C, it is stirred with glass bar to dissolved clarification, adds in 17% ammonium hydroxide of 100g, stirred evenly rear spare.
Concrete operations are:
Laboratory 30L glass reaction kettle is as reaction vessel, using the constant pressure funnel of 3L in batches respectively by active metal The aqueous slkali B of salting liquid A and inert metal salt, by way of manually adjusting, two kinds of solution of control are at the uniform velocity added dropwise, it is ensured that It is added dropwise simultaneously.Reacting kettle jacketing leads to 30-35 DEG C of recirculated water controlling reaction temperature, and 1h is stirred after being added dropwise;Product carries out Centrifugal filtration, it is neutral to be beaten with deionized water to pH, and 110 DEG C of drying 10-12h, 450 DEG C of roasting 2h select 80- after screening 100 mesh are qualified catalyst, are weighed as 91g.
Carry out the catalysis of multi-walled carbon nanotube with it, a diameter of 100mm, length in 1600mm stainless steel fluid beds into Row reaction, feed intake 1.5g, after hydrogen reducing, controls 680-690 DEG C of temperature, is passed through propylene:Nitrogen is 1000:2000ml/min's Gas 50min obtains multi-walled carbon nanotube product 34.8g;Its SEM picture is shown in attached drawing 3.
The data summarization comparison of each comparative example is shown in Table 1.
Table 1 is the data summary table of each comparative example
It can see by the comparison of Fig. 3, Fig. 4 and Fig. 5, iron system and nickel catalyst growth prepared by technical solution of the present invention Carbon nanotubes, Diameter distribution section more concentrates, and the difference between pipe is small, and uniformity consistency is strong.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention God and any modification, equivalent substitution, improvement and etc. within principle, done, should all be included in the protection scope of the present invention.

Claims (7)

1. a kind of continuous producing carbon nano-tube method of poly-metal deoxide pore space structure catalyst, by active metal salt with going Ionized water is configured to the continuous ground pump of aqueous slkali that active metal salt solution and inert metal salt are configured to inert metal salt with lye Enter reaction member, under certain condition, carry out precipitation reaction in the reaction cell and prepare presoma, reactant is filtered, washing, dry It obtains preparing carbon nanotubes poly-metal deoxide pore space structure catalyst after dry, roasting, screening.
2. a kind of side of continuous producing carbon nano-tube poly-metal deoxide pore space structure catalyst according to claim 1 Method, which is characterized in that it is as follows, including:
(1)Active metal salt and deionized water are configured to solution A, and A liquid is active metal salt solution, mass fraction 5%-60%;
(2)Inert metal salt and Alkali liquid compounding are into solution B, and B liquid is the aqueous slkali of inert metal salt, mass fraction 2%-60%;
(3)A and B solution are continuously delivered continuously to reaction member by accurate measurement pump, and the flow volume ratio of wherein A and B are A:B =0.7-1.5:1;
(4)Reaction temperature is 15 DEG C -80 DEG C, reaction pressure 0.05Mpa-0.2Mpa, and material carries out in micro passage reaction Reaction, the residence time is in 3-8s, then continuous ejection;
(5)Material is filtered, washing, and overnight, 350-700 DEG C of roasting, screening obtains product for 70-150 DEG C of drying.
3. a kind of continuous producing carbon nano-tube according to claim 1 or 2 poly-metal deoxide pore space structure catalyst Method, which is characterized in that the reaction member is micro passage reaction, and micro passage reaction is covering 1nm-50mm One or more combinations in single channel, multichannel, Parallel Unit, the parallel system of highly dense, micro passage reaction material Matter is silicon carbide ceramics, glass, quartz, stainless steel, Hastelloy or graphite.
4. a kind of continuous producing carbon nano-tube according to claim 1 or 2 poly-metal deoxide pore space structure catalyst Method, which is characterized in that the active metal salt is iron, nickel, cobalt, manganese, platinum, aluminium, the one of the nitrate of magnesium or sulfate Kind is a variety of, and the mass fraction of active metal salt solution is preferably 20%-50%.
5. a kind of continuous producing carbon nano-tube according to claim 1 or 2 poly-metal deoxide pore space structure catalyst Method, which is characterized in that inert metal salt for ammonium molybdate, the one or more of ammonium carbonate;Lye for sodium hydroxide or Ammonium hydroxide is a kind of or mixes;The preferred 5%-50% of mass fraction of the aqueous slkali of inert metal salt.
6. a kind of continuous producing carbon nano-tube according to claim 1 or 2 poly-metal deoxide pore space structure catalyst Method, which is characterized in that the flow volume ratio of the active metal salt solution and inert metal salting liquid is 0.7:1 - 1.5:1, it is preferably 0.9-1.3:1, further preferably 1:1.
7. a kind of continuous producing carbon nano-tube according to claim 1 or 2 poly-metal deoxide pore space structure catalyst Method, which is characterized in that the step(5)Drying temperature for 100-120 DEG C, calcination temperature is 400 DEG C -600 DEG C.
CN201711278563.7A 2017-12-06 2017-12-06 A kind of method of continuous producing carbon nano-tube poly-metal deoxide pore space structure catalyst Pending CN108079999A (en)

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