CN110252321A - A method of vapor deposition preparation CoMo system Hydrobon catalyst - Google Patents

A method of vapor deposition preparation CoMo system Hydrobon catalyst Download PDF

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CN110252321A
CN110252321A CN201910655664.4A CN201910655664A CN110252321A CN 110252321 A CN110252321 A CN 110252321A CN 201910655664 A CN201910655664 A CN 201910655664A CN 110252321 A CN110252321 A CN 110252321A
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catalyst
como
carrier
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江莉龙
陈建军
米金星
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Fuzhou University
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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
    • 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
    • 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
    • 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
    • B01J35/64Pore diameter
    • B01J35/6472-50 nm
    • 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
    • B01J37/0201Impregnation
    • 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
    • B01J37/082Decomposition and pyrolysis
    • 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
    • B01J37/20Sulfiding
    • 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
    • B01J37/34Irradiation by, or application of, electric, magnetic or wave energy, e.g. ultrasonic waves ; Ionic sputtering; Flame or plasma spraying; Particle radiation
    • B01J37/341Irradiation by, or application of, electric, magnetic or wave energy, e.g. ultrasonic waves ; Ionic sputtering; Flame or plasma spraying; Particle radiation making use of electric or magnetic fields, wave energy or particle radiation
    • B01J37/347Ionic or cathodic spraying; Electric discharge
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10GCRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G45/00Refining of hydrocarbon oils using hydrogen or hydrogen-generating compounds
    • C10G45/02Refining of hydrocarbon oils using hydrogen or hydrogen-generating compounds to eliminate hetero atoms without changing the skeleton of the hydrocarbon involved and without cracking into lower boiling hydrocarbons; Hydrofinishing
    • C10G45/04Refining of hydrocarbon oils using hydrogen or hydrogen-generating compounds to eliminate hetero atoms without changing the skeleton of the hydrocarbon involved and without cracking into lower boiling hydrocarbons; Hydrofinishing characterised by the catalyst used
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10GCRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G45/00Refining of hydrocarbon oils using hydrogen or hydrogen-generating compounds
    • C10G45/02Refining of hydrocarbon oils using hydrogen or hydrogen-generating compounds to eliminate hetero atoms without changing the skeleton of the hydrocarbon involved and without cracking into lower boiling hydrocarbons; Hydrofinishing
    • C10G45/04Refining of hydrocarbon oils using hydrogen or hydrogen-generating compounds to eliminate hetero atoms without changing the skeleton of the hydrocarbon involved and without cracking into lower boiling hydrocarbons; Hydrofinishing characterised by the catalyst used
    • C10G45/06Refining of hydrocarbon oils using hydrogen or hydrogen-generating compounds to eliminate hetero atoms without changing the skeleton of the hydrocarbon involved and without cracking into lower boiling hydrocarbons; Hydrofinishing characterised by the catalyst used containing nickel or cobalt metal, or compounds thereof
    • C10G45/08Refining of hydrocarbon oils using hydrogen or hydrogen-generating compounds to eliminate hetero atoms without changing the skeleton of the hydrocarbon involved and without cracking into lower boiling hydrocarbons; Hydrofinishing characterised by the catalyst used containing nickel or cobalt metal, or compounds thereof in combination with chromium, molybdenum, or tungsten metals, or compounds thereof
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10GCRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G2300/00Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
    • C10G2300/20Characteristics of the feedstock or the products
    • C10G2300/201Impurities
    • C10G2300/202Heteroatoms content, i.e. S, N, O, P

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Abstract

The present invention relates to a kind of methods for being vapor-deposited and preparing CoMo system Hydrobon catalyst.For the problem that CoMo co-impregnation causes its dispersion uneven, poor activity.The order mesoporous Al of bigger serface is prepared first with sol-gal process2O3Carrier, then active component Mo is introduced by carrier surface using equi-volume impregnating, by vacuumizing, it is high temperature vulcanized to obtain sulphided state catalyst, and then auxiliary agent Co is re-introduced into sulphided state catalyst surface by gas phase deposition technology, the sulphided state catalyst containing more CoMoS activity phases is obtained after post-cure.CoMo/Al prepared by the present invention2O3Catalyst activity component is uniformly dispersed, and has excellent hydrodesulfurization activity and stability under auxiliary agent and the lower situation of active component content.

Description

A method of vapor deposition preparation CoMo system Hydrobon catalyst
Technical field
The invention belongs to Hydrobon catalyst technical fields, and in particular to a kind of vapor deposition preparation CoMo system adds hydrogen de- The method of sulfur catalyst.
Background technique
As the in poor quality of fossil energy is increasingly severe, and people are also higher and higher to living standard and environmental requirement, Therefore the Law on Environmental Protection being increasingly stringenter also is formulated in succession.Especially in fuel oil combustion oxygen sulfur compound side generated On the one hand face, the generation of the oxysulfide are detrimental to health, be on the other hand lead to the environmental problems such as acid rain, haze main One of reason.Based on this, stringent sulfur content of fuel oil discharge standard has all been formulated in China or even world wide.Although at me The Shanghai of state, a line city such as Guangzhou use IV standard of state that sulfur content is lower than 50 μ g/g, but also not big in China Area is promoted, and the quality of petrol and diesel oil still lags behind developed country.Wherein the U.S. just had reached fuel early in 2010 Sulfur content is lower than the standard of 15 μ g/g in oil.Therefore, it is raw to become health of people for the production low-sulfur even clean fuel oil without sulphur It is living, Ecological Sustainable Development and the improved day by day most important thing of environmental resource.
So far, there is mature Hydrobon catalyst.Catalysis used in traditional hydrodesulfurization Agent is usually with Al2O3For carrier, Ni or Co are as auxiliary agent, Mo or W as active component, and this catalyst is in normal conditions With excellent hydrodesulfurization effect, but it is difficult to break through the limit of the sulfur content less than 1000 ppm.Therefore want to reach higher sulphur Content discharge standard, reaction condition will carry out stringent adjustment.Therefore, new and effective deep hydrodesulfurizationof catalysis is developed Agent becomes the most effective and practical means for solving this problem.And the research and development of deep hydrodesulfurizationof catalyst mainly from It is unfolded in terms of the loading method, the higher component of screening activity and the better carrier three of searching that improve active component.
Currently, the CoMo Hydrobon catalyst oxide carrier studied mainly has γ-Al2O3, SiO2, TiO2, ZrO2 And its carriers such as part composite oxides.At the same time, there are also researchers by being urged to improve these support modifications The hydrodesulfurization effect of agent.Although there are many relevant reports for selection and use aspect about carrier, it is being catalyzed Through frequently with traditional equi-volume impregnating in the preparation of agent.And this obtained catalyst activity component dispersion of carrying method Spend lower, the interaction between carrier and active component is weaker, is unfavorable for active promotion.Therefore herein with order mesoporous Al2O3 For carrier, highly effective hydrogenation desulphurization catalyst is prepared using vapor deposition (CVD) method, directly loads the active group easily dispersed first Divide Mo, be vapor-deposited the active component Co for being not easy to disperse again after tentatively vulcanizing, and high dispersive is obtained after post-cure CoMo base Hydrobon catalyst.
Summary of the invention
It is an object of the invention to be directed to existing tradition CoMo/Al prepared by infusion process2O3Hydrodesulphurizatiocatalyst catalyst activity group It is unevenly distributed, the low problem of catalytic performance.The present invention provides one kind with mesoporous Al2O3For the CoMo system hydrodesulfurization of carrier Catalyst.The present invention is the load of two steps, first loads easily dispersible active component MoO using infusion process3, gas is used after vulcanization again Phase sedimentation introduces auxiliary agent CoO, obtains the CoMo/Al of high dispersive by post-cure2O3Hydrobon catalyst.
To achieve the above object, the present invention adopts the following technical scheme:
One kind is with mesoporous Al2O3For the CoMo system Hydrobon catalyst of carrier, with mesoporous Al2O3For carrier, CoO is auxiliary agent, MoO3For active component, wherein CoO is calculated as 0.5 ~ 3%, MoO by the mass fraction of Co33 ~ 8% are calculated as by the mass fraction of Mo, this is urged Agent is denoted as CoMo/Al2O3
One kind is with mesoporous Al2O3For the preparation method of the CoMo system Hydrobon catalyst of carrier, comprising the following steps:
(1) mesoporous Al2O3The preparation of carrier: at room temperature, the P123 of certain mass being dissolved in the hydrochloric acid solution of dehydrated alcohol, It adjusts after pH is 5 ~ 6 and obtains solution A;At the same time, a certain amount of isopropanol is added in solution A and forms solution B and persistently stirs It mixes;Then the acetic acid of certain mass and organic aluminium salt are slowly added into solution B in the case where being stirred continuously, adjust solution A period of time is vigorously stirred with 500 ~ 800 r/min again after pH to neutrality;By solution, aging is obtained at room temperature after stirring Colloidal sol continues drying and obtains xerogel, obtains high specific surface area and mesoporous Al after high-temperature roasting is cooling2O3Carrier;
(2) CoMo/Al2O3The preparation of catalyst: the certain density (NH of configuration4)6 Mo7O24·4H2O solution, using isometric Infusion process is loaded to the mesoporous Al of step (1) preparation2O3On carrier, Mo/Al is obtained after dry2O3Catalyst;By Mo/Al2O3 Catalyst is placed in vulcanization plant, and system is evacuated to 10-3Primary vulcanization processing, room to be down to are carried out to the catalyst after Pa Co salt is loaded to by sulphided state Mo/Al using vapour deposition process (CVD) at normal temperatures and pressures after temperature2O3And then catalyst carries out Post-cure processing is to get CoMo system Hydrobon catalyst CoMo/Al2O3Catalyst.
Wherein P123 mass as described in step (1) is 1 ~ 2 g, and dehydrated alcohol dosage is 15 mL, and concentrated hydrochloric acid dosage is 1 ~ 2 mL, the dosage of isopropanol are 5 mL, and the dosage of acetic acid is 1.5 mmol, and the dosage of organic aluminium salt is 0.01 mol.
Wherein organic aluminium salt as described in step (1) is one of aluminium isopropoxide, aluminium triformate and propionic acid aluminium.
Wherein drying temperature as described in step (1) is 60 ~ 100 DEG C, and maturing temperature is 800 ~ 1000 DEG C.
Wherein (NH described in step (2)4)6 Mo7O24·4H2The concentration of O solution is 0.025 mol/L.
Wherein Co salt described in step (2) is three carbonyl nitrosyl radical cobalts, one in cobalt oxalate or acetylacetone cobalt Kind.
The above method prepares resulting CoMo/Al2O3Hydrobon catalyst is applied to thiophene and dibenzothiophenes under normal pressure Hydrodesulfurization reaction.
Of the invention is particularly advantageous in that:
1. Al prepared by the present invention2O3Carrier has bigger serface and good order mesoporous, is on the one hand conducive to active group Point dispersion, be on the other hand conducive to the mass transfer of reactant with separate, the raising of final promotion hydrodesulfurization activity.
2. the active component Mo that the present invention is readily able to dispersion first is carried on carrier surface and carries out vulcanizing treatment, then Auxiliary agent Co is introduced and vulcanized using vapour deposition process, this method is conducive to the generation and dispersion of active phase CoMoS phase, thus Promote the raising of catalytic activity.
Detailed description of the invention
Fig. 1 is Al in embodiment 22O3The transmission electron microscope picture of carrier;
Fig. 2 is the In-situ Infrared figure of embodiment 2 and the preparation gained catalyst of comparative example 1.A: embodiment 2;B: comparative example 1.
Fig. 3 is the transmission electron microscope picture of embodiment 3 and the preparation gained catalyst of comparative example 1.A: embodiment 3;B: comparative example 1.
Specific embodiment
The present invention is further explained with reference to embodiments, but protection scope of the present invention is not limited to following embodiments.For Further illustrate experimental implementation and its experimental result of the invention, this part combines the embodiment of invention to be retouched in more detail It states.
Embodiment 1
One kind is with mesoporous Al2O3For the preparation method of the CoMo system Hydrobon catalyst of carrier, comprising the following steps:
(1) mesoporous Al2O3The preparation of carrier: at room temperature, 1.00 g P123 are dissolved in 15 mL dehydrated alcohols and 1.00 mL In the mixed liquor of concentrated hydrochloric acid, pH is adjusted as 5 and obtains solution A.At the same time, solution A is added in 5 mL isopropanols and forms solution B simultaneously 30 min are persistently stirred, are then slowly added to 1.5 mmol acetic acid and 0.01 mol aluminium isopropoxide in the case where being stirred continuously In solution B, adjusting pH value to 7, then carry out being vigorously stirred 5 h with 500r/min.By above-mentioned solution, 12 h of aging is obtained at room temperature To colloidal sol, then places it in 60 °C of progress solvents in baking oven and volatilize to obtain xerogel, then xerogel is placed in Muffle furnace In 400 °C of 4 h of heat preservation are raised to the rate of 1 °C/min, 800 °C of 1 h of roasting are then raised to the rate of 10 °C/min, Obtain high specific surface area and mesoporous Al2O3Carrier.The mesoporous Al of gained2O3Specific surface be 287 m2/ g, average pore size are 7.9 nm.
(2) CoMo/Al2O3The preparation of catalyst: configuration concentration is the (NH of 0.025 mol/L4)6 Mo7O24·4H2O is molten Liquid uses equi-volume impregnating by active component MoO after weighing the molybdenum solution of 9.5 mL3Load to Al prepared by 2g2O3Carrier On, oxidation state Mo/Al is obtained after 150 DEG C of 2 h of drying2O3Catalyst.By above-mentioned Mo/Al2O3Catalyst is placed in vulcanization plant, System is evacuated to 10-310%H is passed through under the conditions of 350 DEG C after Pa2S/H2(30ml/min) vulcanizes 2 h, is then switched to Ar The system is down to room temperature.And then using vapour deposition process (CVD) by three carbonyl nitrosyl radical cobalt liquors (0.1 mol/L, 2.25 mL) Mo/Al of the pulse injection to after vulcanizing2O3On, later at 350 DEG C 2 h of revulcanization to get arrive CoMo/ Al2O3Catalyst is denoted as catalyst A, and the mass fraction that wherein mass fraction of Co is 1.3%, Mo is 8.0%.
Embodiment 2
One kind is with mesoporous Al2O3For the preparation method of the CoMo system Hydrobon catalyst of carrier, comprising the following steps:
(1) mesoporous Al2O3The synthesis of carrier: at room temperature, 2.00 g P123 are dissolved in 15 mL dehydrated alcohols and 1.00mL In the mixed liquor of concentrated hydrochloric acid, pH is adjusted as 6 and obtains solution A.At the same time, solution A is added in 5 mL isopropanols and forms solution B simultaneously 30 min are persistently stirred, are then slowly added to 1.5 mmol acetic acid and 0.01 mol propionic acid aluminium in the case where being stirred continuously molten In liquid B, adjusting pH value is 7, then carries out being vigorously stirred 5 h with 800r/min.By above-mentioned solution, 12 h of aging is obtained at room temperature To colloidal sol, then places it in 70 °C of progress solvents in baking oven and volatilize to obtain xerogel, xerogel is placed in Muffle furnace 400 °C of 4 h of heat preservation are raised to the rate of 1 °C/min, 900 °C of 2 h of roasting are then raised to the rate of 10 °C/min, are obtained High specific surface area and mesoporous Al2O3Carrier.The mesoporous Al of gained2O3The specific surface of carrier is 249 m2/ g, average pore size are 7.5 nm.
(2) CoMo/Al2O3The preparation of catalyst: configuration concentration is the (NH of 0.025 mol/L4)6 Mo7O24·4H2O is molten Liquid uses equi-volume impregnating by active component MoO after weighing the molybdenum solution of 3.56 mL3Load to Al prepared by 2 g2O3Carrier On, oxidation state Mo/Al is obtained after 150 DEG C of 2 h of drying2O3Catalyst.By above-mentioned Mo/Al2O3Catalyst is placed in vulcanization plant, System is evacuated to 10-310%H is passed through under the conditions of 350 DEG C after Pa2S/H2(30ml/min) vulcanizes 2 h, is then switched to Ar The system is down to room temperature.And then use vapour deposition process (CVD) by oxalic acid cobalt liquor (0.05 mol/L, 1.7 mL) pulse Mo/Al after being injected to vulcanization2O3On, later at 350 DEG C 2 h of revulcanization to get arrive CoMo/Al2O3Catalyst is denoted as Catalyst B, the mass fraction that wherein mass fraction of Co is 0.5%, Mo is 3%.
Embodiment 3
One kind is with mesoporous Al2O3For the preparation method of the CoMo system Hydrobon catalyst of carrier, comprising the following steps:
(1) mesoporous Al2O3The synthesis of carrier: at room temperature, 1.00 g P123 are dissolved in 15 mL dehydrated alcohols and 1.00mL In concentrated hydrochloric acid mixed liquor, pH is adjusted as 5.5 and obtains solution A.At the same time, solution A is added in 5 mL isopropanols and forms new soln B And continue to stir 30 min, then 1.5 mmol acetic acid and 0.01 mol aluminium triformate are slowly added in the case where being stirred continuously In the solution, adjusting pH value is 7, then carries out being vigorously stirred 5 h with 600r/min.By above-mentioned solution, aging 12h is obtained at room temperature To colloidal sol, then places it in 80 °C of progress solvents in baking oven and volatilize to obtain xerogel, xerogel is placed in Muffle furnace 400 °C of 4 h of heat preservation are raised to the rate of 1 °C/min, 1000 °C of 1 h of roasting are then raised to the rate of 10 °C/min, Obtain high specific surface area and mesoporous Al2O3Carrier.The mesoporous Al of gained2O3The specific surface of carrier is 221 m2/ g, average pore size 6.8 nm。
(2) CoMo/Al2O3The preparation of catalyst: configuration concentration is the (NH of 0.025 mol/L4)6 Mo7O24·4H2O is molten Liquid uses equi-volume impregnating by active component MoO after weighing the molybdenum solution of 7 mL3Load to Al prepared by 2 g2O3On carrier, Oxidation state Mo/Al is obtained after 150 DEG C of 2 h of drying2O3Catalyst.By above-mentioned Mo/Al2O3Catalyst is placed in vulcanization plant, is System is evacuated to 10-310%H is passed through under the conditions of 350 DEG C after Pa2S/H2(30ml/min) vulcanizes 2 h, and being then switched to Ar will The system is down to room temperature.And then use vapour deposition process (CVD) by acetylacetone,2,4-pentanedione cobalt liquor (0.15 mol/L, 3.38 mL) Pulse injection to sulphided state Mo/Al2O3On, later at 350 DEG C 2 h of revulcanization to get arrive CoMo/Al2O3Catalysis Agent is denoted as catalyst C, and the mass fraction that wherein mass fraction of Co is 3%, Mo is 5.9%.
Embodiment 4
One kind is with mesoporous Al2O3For the preparation method of the CoMo system Hydrobon catalyst of carrier, comprising the following steps:
(1) mesoporous Al2O3The synthesis of carrier: at room temperature, 1.50 g P123 are dissolved in 15 mL dehydrated alcohols and 1.50 mL Concentrated hydrochloric acid mixed liquor in, adjusting pH is 5 to obtain solution A.At the same time, solution A is added in 5 mL isopropanols and forms solution B And continue to stir 30 min, it is then in the case where being stirred continuously that 1.5 mmol acetic acid and 0.01 mol aluminium isopropoxide are slow It is added in the solution, adjusting pH value is 7, then carries out being vigorously stirred 5 h with 700r/min.By above-mentioned solution aging 12 at room temperature H obtains colloidal sol, then places it in 100 °C of progress solvents in baking oven and volatilizees to obtain xerogel, xerogel is placed in horse 300 °C of 4 h of heat preservation are not raised to the rate of 1 °C/min in furnace, 800 °C of roastings 3 are then raised to the rate of 10 °C/min H obtains high specific surface area and mesoporous Al2O3Carrier.The mesoporous Al of gained2O3The specific surface of carrier is 314 m2/ g, average pore size 8.5 nm。
(2) preparation of catalyst: configuration concentration is the (NH of 0.025 mol/L4)6 Mo7O24·4H2O solution weighs 8 mL Molybdenum solution after using equi-volume impregnating by active component MoO3Load to Al prepared by 2 g2O3On carrier, 150 DEG C of dryings Oxidation state Mo/Al can be obtained after 2h2O3Catalyst.By above-mentioned Mo/Al2O3Catalyst is placed in vulcanization plant, and system is evacuated to 10-310%H is passed through under the conditions of 350 DEG C after Pa2S/H2(30ml/min) vulcanizes 2h, is then switched to Ar for the system and is down to room Temperature.And then (0.15 mol/L, the 2.10 mL) pulse of three carbonyl nitrosyl radical cobalt liquors is infused using vapour deposition process (CVD) Mo/Al after being incident upon vulcanization2O3On, later at 350 DEG C 2 h of revulcanization to get arrive CoMo/Al2O3Catalyst is denoted as Catalyst D, the mass fraction that wherein mass fraction of Co is 1.9%, Mo is 6.7%.
Comparative example 1
(1) Al2O3The synthesis of carrier: with embodiment 1
(2) preparation of catalyst: compound concentration is 0.05 mol/LCo (NO3)2·6H2O and 0.025mol/L (NH4)6 Mo7O24·4H2The mixed solution of O.Using equi-volume impregnating, by 8 mL, the solution is impregnated into 2 g Al of gained2O3On, after pass through CoMo/Al is obtained after crossing standing, drying2O3The catalyst is placed in vulcanization plant by catalyst, and system is evacuated to 10-3 After Pa 10%H is passed through under the conditions of 350 DEG C2S/H2(30 ml/min) vulcanizes 2 h, is then switched to Ar for the system and is down to room temperature, remembers For catalyst E, the mass fraction that wherein mass fraction of Co is 2.3%, Mo is 6.7%.
Comparative example 2
(1) Al2O3Carrier: with business Al2O3(traditional Chinese medicines, specific surface area are about 250 m2/ g) it is carrier.
(2) configuration concentration is the (NH of 0.025 mol/L4)6 Mo7O24·4H2O solution is adopted after weighing the molybdenum solution of 6 mL With equi-volume impregnating by active component MoO3Load to 2 g business Al2O3On, oxidation state Mo/ is obtained after 150 DEG C of dry 2h Al2O3Catalyst.By above-mentioned Mo/Al2O3It is placed in vulcanization plant, system is evacuated to 10-3It is passed through under the conditions of 350 DEG C after Pa 10%H2S/H2(30ml/min) vulcanizes 2 h, is then switched to Ar for the system and is down to room temperature.And then vapour deposition process is used (CVD) Mo/A by three carbonyl nitrosyl radical cobalt liquors (0.015 mol/L, 1.80 mL) pulse injection to after vulcanizing2O3On, Later at 350 DEG C revulcanization 2h to get arrive CoMo/Al2O3Catalyst is denoted as catalyst F, and wherein the mass fraction of Co is The mass fraction of 1.6%, Mo are 5.0%.
The activity rating of the catalyst of above-mentioned case preparation is produced by Beijing Xin Hangdun petrochemical industry Science and Technology Ltd. (MRT-6113) is carried out on microscale experiment reaction unit, 500 DEG C of system design pressure, system design temperature: 8 MPa, reactor 10 mm of internal diameter, microprocessor pump drive range 0.001-1sccm, mass flowmenter range: 0-200sccm;By Shimadzu Corporation's production Product analysis is carried out on GC-MS.
Application Example
Using thiophene or 4,6- dimethyl Dibenzothiophene (4,6-DMDBT) content be 3 wt% n-heptane solution as model chemical combination Raw material.Rhohene desulfiirization reaction: being packed into 2 g catalyst into hydrodesulfurization unit, normal pressure, and 350 DEG C, hydrogen flowing quantity 150 ml min-1.Then pure hydrogen passes through the chemical industry saturator containing organic sulfur at 18 DEG C of constant temperature.After reaction, using GC or Sulfur content carries out analysis survey in RPP-5000SN type sulphur blood urea/nitrogen analyzer (Taizhou Zhonghuan Analyzer Instrument Co., Ltd.) analysis product Examination.
Interpretation of result
The thiophene of 1 catalyst of table and the Activity Results of dibenzothiophenes Hydrobon catalyst
Table 1 is the evaluation index of the Hydrobon catalyst in embodiment 1-4 and comparative example 1,2 using the method for the present invention preparation. As it can be seen from table 1 Hydrobon catalyst (sample A-D) of the present invention has high desulphurizing activated, wherein catalyst A Thiophene conversion ratio under normal pressure at 350 DEG C is up to 96.4%, and the conversion ratio of dibenzothiophenes conversion ratio is also up to 91.9%.Add hydrogen It is desulphurizing activated to be apparently higher than catalyst E that traditional infusion process is prepared and with business Al2O3The catalyst F obtained for carrier.Its At 350 DEG C, the conversion ratio of thiophene and dibenzothiophenes is respectively 75.6% and 69.3% under middle catalyst F normal pressure.By connecting It can be seen that after the dibenzothiophenes hydrodesulfurization stability test of continuous 40 h, in embodiment 1-4 under the conversion ratio of dibenzothiophenes That drops is unobvious.Especially embodiment 4, conversion ratio is reduced only by 1.6% after 40 h test, and comparative example 1 and 2 is same Under conditions of have dropped 8.7% and 15% respectively.Illustrate that the catalyst of invention preparation is with good stability.
Fig. 1 is 2 intermediary hole Al of embodiment2O3The transmission electron microscope picture of carrier.It is observed from fig. 1 that orderly Jie arranged in parallel The two-dimentional hexagonal hole road in hole duct and high-sequential illustrates prepared mesoporous Al2O3Carrier has typical case after high-temperature roasting Six side's symmetric form ordered mesopore structure of two dimension.
Fig. 2 is embodiment 2 (A) and the In-situ Infrared figure of comparative example 1 (B) preparation gained catalyst.It uses as seen from Figure 2 Its surface after over cure catalyst B prepared by the method for the present invention forms more CoMoS activity phases, and is significantly more than MoS2Active phase.And the surface catalyst E for using traditional infusion process to be prepared is then to form more MoS2Active phase.It is many Well known, CoMoS activity mutually has higher hydrodesulfurization activity, therefore catalyst prepared by the present invention is with superior Hydrodesulfurization activity.
Fig. 3 is the transmission electron microscope picture of embodiment 3 and the preparation gained catalyst of comparative example 1, the catalyst as can be seen from Figure 3 vulcanized C and catalyst E analyzes to investigate different carriers to MoS by high-resolution-ration transmission electric-lens (HRTEM)2The length and stacking number of lamella Influence.As shown in (A) of fig. 3, it is evident that find out catalyst surface have the less number of plies and short length MoS2Piece.From (B) its MoS in catalyst E is found out in2The lamella number of plies has rising, and length increases.And MoS2The drop of the stacking number of plies and length It is low to be conducive to expose more active site Mo position, especially reduction of the stacking number of plies at position and S and promote middle layer MoS2 Exposure, and then be conducive to active raising.Therefore catalyst prepared by the present invention has excellent hydrodesulfurization activity.
Obviously, above-described embodiment be used for the purpose of clearly demonstrating situation and for example, be not to embodiment into Restriction is gone.It therefore, can be can also make on the basis of examples detailed above for those of ordinary skill in the art Other various forms of variations.Here it illustrates, but is thus drawn apparent one by one without to all embodiments Variation or change still in the protection scope of the invention within.

Claims (8)

1. one kind is with mesoporous Al2O3For the CoMo system Hydrobon catalyst of carrier, it is characterised in that: the CoMo system plus hydrogen are de- Sulfur catalyst is with mesoporous Al2O3For carrier, using CoO as auxiliary agent, MoO3For active component, wherein CoO is calculated as by the mass fraction of Co 0.5 ~ 3%, MoO33 ~ 8% are calculated as by the mass fraction of Mo, which is denoted as CoMo/Al2O3
2. one kind as described in claim 1 is with mesoporous Al2O3For the preparation method of the CoMo system Hydrobon catalyst of carrier, It is characterized by comprising the following steps:
(1) mesoporous Al2O3The preparation of carrier: at room temperature, the P123 of certain mass being dissolved in the hydrochloric acid solution of dehydrated alcohol, It adjusts after pH is 5 ~ 6 and obtains solution A;At the same time, a certain amount of isopropanol is added in solution A and forms solution B and persistently stirs It mixes, then a certain amount of acetic acid and organic aluminium salt is slowly added into solution B in the case where being stirred continuously, adjust pH value of solution A period of time is vigorously stirred with 500 ~ 800 r/min again after to neutrality;By above-mentioned solution, aging is obtained at room temperature after stirring To colloidal sol, continues drying and obtain xerogel, obtain high specific surface area and mesoporous Al after high-temperature roasting is cooling2O3Carrier;
(2) CoMo/Al2O3The preparation of catalyst: the certain density (NH of configuration4)6 Mo7O24·4H2O solution, using isometric leaching Stain method is loaded to mesoporous Al2O3On carrier, Mo/Al can be obtained after dry2O3Catalyst;By Mo/Al2O3Catalyst is placed in vulcanization Device, system are evacuated to 10-3Vulcanizing treatment is carried out to the catalyst after Pa, wait be cooled to room temperature at normal temperatures and pressures using gas Co salt is loaded to sulphided state Mo/Al by phase sedimentation2O3And then catalyst carries out post-cure processing to get CoMo system plus hydrogen Desulphurization catalyst CoMo/Al2O3
3. preparation method according to claim 2, which is characterized in that P123 mass as described in step (1) is 1 ~ 2 g, Dehydrated alcohol dosage is 15 mL, and concentrated hydrochloric acid dosage is 1 ~ 2 mL, and the dosage of isopropanol is 5 mL, and the dosage of acetic acid is 1.5 Mmol, the dosage of organic aluminium salt are 0.01 mol.
4. preparation method according to claim 2, which is characterized in that organic aluminium salt as described in step (1) is isopropanol One of aluminium, aluminium triformate and propionic acid aluminium.
5. preparation method according to claim 2, which is characterized in that drying temperature as described in step (1) is 60 ~ 100 DEG C, maturing temperature is 800 ~ 1000 DEG C.
6. preparation method according to claim 2, which is characterized in that (NH described in step (2)4)6 Mo7O24·4H2O is molten The concentration of liquid is 0.025 mol/L.
7. preparation method according to claim 2, which is characterized in that Co salt described in step (2) is three carbonyl nitrous Acyl cobalt, one of cobalt oxalate or acetylacetone cobalt.
8. one kind as described in claim 1 is with mesoporous Al2O3It is special for the application of the CoMo system Hydrobon catalyst of carrier Sign is: the catalyst is used for thiophene and dibenzothiophenes hydrodesulfurization under normal pressure.
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Application publication date: 20190920