CN107159219A - A kind of cobalt-base catalyst and preparation method for acetic acid self-heating reforming hydrogen manufacturing gas - Google Patents

A kind of cobalt-base catalyst and preparation method for acetic acid self-heating reforming hydrogen manufacturing gas Download PDF

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CN107159219A
CN107159219A CN201710355478.XA CN201710355478A CN107159219A CN 107159219 A CN107159219 A CN 107159219A CN 201710355478 A CN201710355478 A CN 201710355478A CN 107159219 A CN107159219 A CN 107159219A
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catalyst
cobalt
acetic acid
oxide
acid self
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CN107159219B (en
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黄利宏
周庆
王巧
李辉谷
杨季龙
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Chengdu Univeristy of Technology
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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
    • B01J23/80Catalysts 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 zinc, cadmium or mercury
    • 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
    • B01J23/002Mixed oxides other than spinels, e.g. perovskite
    • B01J35/60
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B3/00Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen
    • C01B3/02Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen
    • C01B3/32Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide, air
    • C01B3/323Catalytic reaction of gaseous or liquid organic compounds other than hydrocarbons with gasifying agents
    • C01B3/326Catalytic reaction of gaseous or liquid organic compounds other than hydrocarbons with gasifying agents characterised by the catalyst
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2523/00Constitutive chemical elements of heterogeneous catalysts
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    • C01BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B2203/00Integrated processes for the production of hydrogen or synthesis gas
    • C01B2203/02Processes for making hydrogen or synthesis gas
    • C01B2203/0205Processes for making hydrogen or synthesis gas containing a reforming step
    • C01B2203/0227Processes for making hydrogen or synthesis gas containing a reforming step containing a catalytic reforming step
    • C01B2203/0233Processes for making hydrogen or synthesis gas containing a reforming step containing a catalytic reforming step the reforming step being a steam reforming step
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B2203/00Integrated processes for the production of hydrogen or synthesis gas
    • C01B2203/02Processes for making hydrogen or synthesis gas
    • C01B2203/0205Processes for making hydrogen or synthesis gas containing a reforming step
    • C01B2203/0227Processes for making hydrogen or synthesis gas containing a reforming step containing a catalytic reforming step
    • C01B2203/0244Processes for making hydrogen or synthesis gas containing a reforming step containing a catalytic reforming step the reforming step being an autothermal reforming step, e.g. secondary reforming processes
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B2203/00Integrated processes for the production of hydrogen or synthesis gas
    • C01B2203/02Processes for making hydrogen or synthesis gas
    • C01B2203/025Processes for making hydrogen or synthesis gas containing a partial oxidation step
    • C01B2203/0261Processes for making hydrogen or synthesis gas containing a partial oxidation step containing a catalytic partial oxidation step [CPO]
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B2203/00Integrated processes for the production of hydrogen or synthesis gas
    • C01B2203/12Feeding the process for making hydrogen or synthesis gas
    • C01B2203/1205Composition of the feed
    • C01B2203/1211Organic compounds or organic mixtures used in the process for making hydrogen or synthesis gas

Abstract

The present invention relates to a kind of cobalt-base catalyst of acetic acid self-heating reforming hydrogen manufacturing and preparation method.The present invention is directed to existing the catalyst change of catalyst structure and the oxidation of active component and sintering during acetic acid self-heating recapitalization, and there is provided a kind of resistance to sintering, anti-carbon deposit, resistance to oxidation, active high new catalyst the problem of cause catalyst inactivation.The chemical composition of the catalyst of the present invention is CoaZnbAlO7.5 + δ, wherein a is that 0.25 1.00, b is 0.75 5.00.The present invention uses coprecipitation method to be prepared for Zn Al type stratiform hydrotalcite-like compounds for presoma, and introduces active component cobalt, by same order elements of the cobalt to zinc, enters the veneer structure of hydrotalcite-like compound;The composite oxides of fired acquisition, effectively inhibit active component cobalt possible migration, aggregation and sintering under the conditions of pyroreaction, improve the heat endurance of catalyst;Carrier zinc oxide improves the reproducibility, stability and inoxidizability of active component cobalt simultaneously, so as to improve the activity and stability of catalyst.

Description

A kind of cobalt-base catalyst and preparation method for acetic acid self-heating reforming hydrogen manufacturing gas
Technical field
The present invention relates to a kind of cobalt-base catalyst and preparation method for acetic acid self-heating recapitalization hydrogen making, more specifically Say, be related to a kind of presoma with hydrotalcite-like compound, and cobalt-base catalyst for acetic acid self-heating recapitalization hydrogen making and Preparation method, belongs to the technical field of acetic acid self-heating recapitalization hydrogen making.
Background technology
Hydrogen is a kind of energy carrier of cleaning, and be particularly suitable for use in fuel cell, is considered as the clean energy resource of future ideality Carrier.At present, hydrogen is mainly produced from the conversion of the primary energy such as natural gas, coal, and which results in CO in atmosphere2The increasing of content It is many.The biomass obtained by photosynthesis of plant, is a kind of important regenerative resource.However, biomass energy metric density is low, can It is changed into energy density through fast pyrolysis and reaches 20 MJ/m3Bio-oil, then concentrate the inexpensive preparing hydrogen of scale conversion Gas.In bio-oil, acetic acid is as its main liquid phase constituent, and mass fraction, can be through catalytic reforming process up to 30% Obtain hydrogen.
The main path of acetic acid hydrogen making has steam reforming, partial oxidation and self-heating recapitalization.Vapor reforming hydrogen production It is a strong endothermic reaction, it is necessary to which outside lasting heat supply carrys out maintenance reaction;Other molecular acid is after catalyst surface activation, warp Decarboxylation and dehydration, the easily intermediate product such as generation ketenes, occur polycondensation reaction and form carbon deposit to cause catalyst inactivation; And partial oxidation hydrogen-preparation reaction outside need not continue heat supply, hydrogen yield can be but reduced.For these problems, self-heating can be used Reformation hydrogen production, i.e., introduce a small amount of oxygen or air in acetic acid steam reforming reaction, combine the steam reforming of heat absorption Process and the partial oxidation process of heat release, by adjusting the oxygen content in unstripped gas, with adjust overall reaction reach thermal balance or Gentle heat release;Meanwhile, the introducing of oxygen will influence absorption and activation process of the reactant molecule in catalyst surface, induce The generation and conversion of product are crossed, the generation of carbon deposit predecessor can be suppressed.But, on the other hand, the introducing of oxygen makes catalyst Bed front end forms oxidizing atmosphere, local temperature up to more than 1000 degrees Celsius, easily causes the sintering of catalyst carrier, duct Block and the aggregation of active component becomes big, oxidation, ultimately result in catalyst inactivation.Therefore, development structure stabilization, resistance to oxidation, resistance to The catalyst of sintering and anti-carbon is the matter of utmost importance that acetic acid autothermal reforming reaction hydrogen making process needs to solve.
Metallic cobalt has the ability of higher fracture C-C keys and c h bond, can be applied in acetic acid catalysis hydrogen production reaction, but also The problems such as being faced with sintering, carbon distribution.In addition, for catalyst carrier, the optimization of its acid-base property or structure is beneficial to improve cobalt The performance such as base catalyst activity and anti-carbon.It is used as the Al of carrier2O3, ZnO etc. there is the characteristics of heat endurance is high, wherein Al2O3 The specific surface area of catalyst can be increased, but it has stronger acidity, easily deposits substantial amounts of carbon deposit.ZnO has alkalescence, right The generation of carbon deposit is inhibited, it is possible to promote the hydrogenation and dehydrogenation reaction in steam reformation;In addition, Co bases Zn-Al Composite oxides can form spinel structure(AB2O4), with strong interaction, it is favorably improved the thermally-stabilised of reforming catalyst Property, anti-sintering and anti-carbon performance.Therefore, ZnO-Al is selected2O3Composite oxides are carrier, can effectively improve catalyst Catalytic performance.
For the preparation of Zn Al composite oxide, Zn-Al hydrotalcite-like compound presomas can be used.Hydrotalcite is also known as layer The double hydroxyl composite oxides of shape, it has large specific surface area, the interchangeability of interlayer anion, the controllable of the Nomenclature Composition and Structure of Complexes Property etc. characteristic, can suppress acid by the modulation of composition, and by Zn in hydrotalcite2+Same order elements, introduce activearm Point cobalt, it is fired after form high dispersive Zn Al composite oxide cobalt-base catalyst, it is steady with higher specific surface area, good heat Qualitative, more rich pore structure and stronger alkalescence, so as to the migration of effective inhibitory activity component cobalt, sintering and oxidation, Acetic acid self-heating recapitalization hydrogen making is conducive to react.
The hydrotalcite structure as made from coprecipitation is complete, crystallinity is high and with good layer structure, is conducive to zinc The formation of aluminium composite oxide.The present invention is prepared for Zn-Al houghites using coprecipitation(Zn6Al2(OH)16CO3·H2O) Structured forerunner, introduces active component cobalt, so that the equally distributed composite oxide catalysts of component are obtained, and applied to acetic acid In the reaction of self-heating recapitalization hydrogen making.
The content of the invention
The technical problems to be solved by the invention are, for existing cobalt-base catalyst during self-heating recapitalization hydrogen making Structure easily change and active component cobalt be oxidizable and sintering, and the problem of causing catalyst inactivation, there is provided a kind of Stability Analysis of Structures, resistance to Sintering, resistance to oxidation, activity stabilized new cobalt-base catalyst.
Technical scheme:
Using Zn-Al hydrotalcite-like compounds as the presoma of catalyst, cobalt is introduced as active component, it is fired, contained CoAl2O4、ZnAl2O4、Co3O4With the composite oxide catalysts such as ZnO, active component Co is highly dispersed in composite oxides, Improve the activity and stability of acetic acid self-heating recapitalization hydrogen making reaction.The chemical composition of catalyst of the present invention is CoaZnbAlO7.5 + δ, wherein a is 0.25-1.00, and b is 0.75-5.00.The catalyst oxide composition percentage by weight be: Cobalt oxide 14.0-14.4%, zinc oxide 46.6-76.4%, aluminum oxide 9.5-39.0%.
Specific preparation method comprises the following steps:
1)Co is constituted according to catalyst chemicalaZnbAlO7.5 + δ, wherein a be 0.25-1.00, b is 0.75-5.00, prepare cobalt, zinc, The nitrate mixed solution #1 of aluminium;
2)According to carbonate and mol ratio hydroxy 1:16 and metal cation Co, Zn and Al total electrical charge rubbed with hydroxy You are than being 1:8, prepare the mixed solution #2 of sodium carbonate and sodium hydroxide;
3)Solution #1 and solution #2 is subjected to coprecipitation reaction at 65-80 degrees Celsius, existed so that solution speeds control ph is added dropwise 10.5+In the range of 0.5, and constant temperature is maintained to stir aging 15 ~ 24 hours;Suction filtration, washing three times after, be placed in 105 degrees Celsius In baking oven, dry 12 hours, obtain the catalyst that hydrotalcite-like compound is main body, its typical hydrotalcite-like compound such as X-ray is spread out Penetrate figure(Accompanying drawing 1)It is shown;
4)By step 3)The presoma of gained is warming up to 500-800 degrees Celsius with the speed of 10 centigrade per minutes and is calcined 4 hours, Catalyst of the present invention is obtained, its structure such as X-ray diffractogram(Accompanying drawing 2)It is shown;
5)By step 4)Obtained catalyst(50-200mg)Load fixed bed reactors, be first passed through flow 20mL/min H2 Reduced 1 hour in 600-800 degrees Celsius in atmosphere, carry out activation process, then purged through flow for 30mL/min nitrogen, most The AC/H after vaporization is passed through afterwards2O/O2/N2Mol ratio be 1.0/ (2.5-5.0)/(0.2-0.5)/(2.5-4.5) mixing Gas(Wherein AC is acetic acid), reacted by beds, reaction temperature is 600-800 degrees Celsius.
Beneficial effects of the present invention:
(1)The Zn-Co-Al-O catalyst that the present invention is prepared using coprecipitation, using Zn-Al hydrotalcite-like compounds as presoma, And active component cobalt is introduced, the part of zinc is replaced by cobalt, into the veneer structure of hydrotalcite-like compound, catalyst is improved The decentralization of active component, adds the catalytic active center number of catalyst surface, so as to improve the activity of catalyst;It is fired The composite oxides of acquisition, restrained effectively active component cobalt possible migration, aggregation and sintering under the conditions of pyroreaction, So as to improve heat endurance of the catalyst during self-heating recapitalization.
(2)Present invention introduces basic supports zinc oxide, the acidity of aluminum oxide is reduced, carbon deposit is effectively inhibited, together When zinc presence add the reproducibility of cobalt, so as to be effectively improved the activity and stability of catalyst.
(3)Show through acetic acid autothermal reforming reaction result, catalyst of the invention has Stability Analysis of Structures, resistance to sintering, anti-product The features such as carbon, resistance to oxidation, activity stabilized and high hydrogen yield.
Brief description of the drawings
The presoma X-ray diffraction spectrogram of Fig. 1 catalyst of the present invention.
The X-ray diffraction spectrogram of Fig. 2 catalyst of the present invention.
Reference example 1
Weigh 5.5651 grams of Co (NO3)3.6H2O, 17.0648 grams of Zn (NO3)3.6H2O and 28.6913 gram of Al (NO3)3.9H2O, plus Enter 153 ml deionized waters and be mixed to form solution #1.30.5943 grams of sodium hydroxides and 5.06656 grams of sodium carbonate are weighed, are added 813 ml deionized waters, form solution #2.By in solution #1 and solution #2 pH be 10.5+In the range of 0.5, at 78 degrees Celsius Co-precipitation operation is carried out under water-bath, and maintains the temperature to stir aging 24 hours, sediment is obtained and is washed through filtering and deionization Wash three times, be placed in 105 degrees Celsius of baking ovens and dry 12 hours, obtain houghite presoma, its typical structure such as institute of accompanying drawing 1 Show.The presoma is calcined 4 hours through 700 degrees Celsius, obtains catalyst CDUT-ZC1A, its typical structure is as shown in Figure 2.Through nitrogen Aspiration is attached/detachment assays, it is 16.28 m as a result to show its specific surface area2/g.The weight of the catalyst is constituted:Cobalt oxide contains Measure as 14.3%, zinc oxide content be that 46.7%, alumina content is 39.0%.
The acetic acid autothermal reforming reaction activity rating of catalyst is carried out in continuous fixed bed reactor.By catalyst Grind and tabletting, be sieved into 20-40 mesh, be fitted into reactor, and at a temperature of 700 °C, the H of 20.0mL/min flows2In Reduction 1 hour.The mixed solution of acetic acid and water is injected into vaporizer after vaporization with syringe pump, mixture of oxygen, and add nitrogen For internal standard gas, AC/H is formed2O/O2/N2Mol ratio be 1.0/ (2.5-5.0)/(0.2-0.5)/(2.5-4.5) gaseous mixture Body, and this unstripped gas is imported into reaction bed, reaction condition is normal pressure, air speed 11000-30000mLg-1 h-1, reaction end gas To configure thermal conductivity detector (TCD) and flame ionization ditector and packed column(Porapaq-QS and 5A)And capillary column(Q- Plot)Chromatographic.
Catalyst CDUT-ZC1A is investigated through acetic acid autothermal reforming reaction activity, is 650 degrees Celsius, AC/ in reaction temperature H2O/O2/N2Mol ratio be 1.0/4.0/0.28/3.9, air speed 15000h-1When, the conversion ratio of initial acetic acid is about 96.18%, The yield of hydrogen is about 2.85 mol-H2/ mol-AC, after the investigation time of 15 hours, hydrogen yield is about 2.51 mol- H2/ mol-AC, the selectivity of byproduct methane is 2.39%, and the selectivity of acetone is 2.49%.Post catalyst reaction is carried out XRD, XPS, SEM, TG etc. are characterized, and are as a result shown, the activity reduction in acetic acid autothermal reforming reaction of CDUT-ZC1A catalyst, are Due to there is the sintering of obvious carbon deposit generation and active component cobalt in course of reaction.
Reference example 2
Weigh 5.4622 grams of Co (NO3)3.6H2O, 27.9172 grams of Zn (NO3)3.6H2O and 7.0406 gram of Al (NO3)3.9H2O, is added 131 ml deionized waters are mixed to form solution #1.12.012 grams of sodium hydroxides and 1.9893 grams of sodium carbonate are weighed, 319 millis are added Deionized water is risen, solution #2 is formed.By in solution #1 and solution #2 pH be 10.5+In the range of 0.5, under 78 C water baths Co-precipitation operation is carried out, and maintains the temperature to stir aging 24 hours.Sediment is washed three times through filtering and deionized water, is placed in Dried 12 hours in 105 degrees Celsius of baking ovens, obtain houghite presoma, its typical structure is as shown in Figure 1.The presoma is passed through 700 degrees Celsius are calcined 4 hours, obtain catalyst CDUT-ZC6A, its typical structure is as shown in Figure 2.It is real through nitrogen adsorption/desorption Test, it is 11.73 m as a result to show its specific surface area2/g.The weight of the catalyst is constituted:Cobalt oxide content is 14.0%, oxygen It is that 76.4%, alumina content is 9.6% to change Zn content.
Catalyst CDUT-ZC6A is investigated through acetic acid autothermal reforming reaction activity, is 650 degrees Celsius, AC/ in reaction temperature H2O/O2/N2Mol ratio be 1.0/4.0/0.28/3.9, air speed 15000h-1When, in the investigation time of 15 hours, acetic acid turns Rate is initially 99.13%, and hydrogen yield is initially 2.95 mol-H2/ mol-AC, due to the generation of the sintering, carbon distribution of catalyst And the aggregation increase of active component, the conversion ratio for causing last acetic acid is 94.60%, and hydrogen yield is 2.18 mol-H2/ mol-AC;The selectivity of byproduct methane increases to 3.29% by 1.03%, and the selectivity of acetone increases to 7.31% from 1.12%, and an oxygen The selectivity for changing carbon reduces to 12.67% by 23.09%, and the selectivity of carbon dioxide reduces to 39.83% by 70.25%.After reaction Catalyst has carried out the sign such as XRD, XPS, SEM, TG, as a result shows, CDUT-ZC6A catalyst surfaces have obvious carbon deposit to produce Raw, active component cobalt sintering causes catalyst activity reduction.
Embodiment 1
Weigh 5.5134 grams of Co (NO3)3.6H2O, 22.5415 grams of Zn (NO3)3.6H2O and 17.7653 gram of Al (NO3)3.9H2O, plus Enter 142 ml deionized waters and be mixed to form solution #1.21.2162 grams of sodium hydroxides and 3.5136 grams of sodium carbonate are weighed, 564 are added Ml deionized water, forms solution #2.By in solution #1 and solution #2 pH be 10.5+In the range of 0.5, in 78 C water baths Lower progress co-precipitation operation, and maintain the temperature to stir aging 24 hours.Sediment is washed three times through filtering and deionized water, is put Dried 12 hours in 105 degrees Celsius of baking ovens, obtain houghite presoma, its typical structure is as shown in Figure 1.The presoma It is calcined 4 hours through 700 degrees Celsius, obtains catalyst CDUT-ZC2A, its typical structure is as shown in Figure 2.Through nitrogen adsorption/desorption Experiment, it is 14.89 m as a result to show its specific surface area2/g.The weight of the catalyst is constituted:Cobalt oxide content is 14.2%, Zinc oxide content is that 61.7%, alumina content is 24.1%.
Catalyst CDUT-ZC2A is investigated through acetic acid autothermal reforming reaction activity, is 650 degrees Celsius, AC/ in reaction temperature H2O/O2/N2Mol ratio be 1.0/4.0/0.28/3.9, air speed 15000h-1When, in the investigation time of 15 hours, acetic acid turns Rate is 92.56%, and hydrogen yield is about 2.88 mol-H2/ mol-AC, the selectivity of byproduct methane is 0.92%, acetone Selectivity is 1.29%.And the selectivity of carbon monoxide is 19.76%-20.40%, the selectivity of carbon dioxide is 55.79%- 58.19%.The sign such as XRD, XPS, SEM, TG has been carried out to post catalyst reaction, has as a result been shown:CDUT-ZC2A catalyst has Relatively stable structure, does not there is significant change after reaction.
Embodiment 2
Weigh 5.4898 grams of Co (NO3)3.6H2O, 24.9974 grams of Zn (NO3)3.6H2O and 12.8658 gram of Al (NO3)3.9H2O, plus Enter 137 ml deionized waters and be mixed to form solution #1.17.0113 grams of sodium hydroxides and 2.8172 grams of sodium carbonate are weighed, 452 are added Ml deionized water, forms solution #2.By in solution #1 and solution #2 pH be 10.5+In the range of 0.5, in 78 C water baths Lower progress co-precipitation operation, and maintain the temperature to stir aging 24 hours.Sediment is washed three times through filtering and deionized water, is put Dried 12 hours in 105 degrees Celsius of baking ovens, obtain houghite presoma, its typical structure is as shown in Figure 1.The presoma It is calcined 4 hours through 700 degrees Celsius, obtains catalyst CDUT-ZC3A, its typical structure is as shown in Figure 2.Through nitrogen adsorption/desorption Experiment, it is 16.35m as a result to show its specific surface area2/g.The weight of the catalyst is constituted:Cobalt oxide content is 14.1%, oxygen It is that 68.4%, alumina content is 17.5% to change Zn content.
Catalyst CDUT-ZC3A is investigated through acetic acid autothermal reforming reaction activity, is 650 degrees Celsius, AC/ in reaction temperature H2O/O2/N2Mol ratio be 1.0/4.0/0.28/3.9, air speed 15000h-1When, within the investigation time of 15 hours, acetic acid Conversion ratio is 98.88%, and hydrogen yield is 2.85 mol-H2/ mol-AC, byproduct methane and acetone have obtained effective suppression. The sign such as XRD, XPS, SEM, TG has been carried out to post catalyst reaction, has as a result been shown:CDUT-ZC3A catalyst has stable knot Structure, active component cobalt valence stability, without obvious carbon deposit.
Embodiment 3
Weigh 5.4770 grams of Co (NO3)3.6H2O, 26.3915 grams of Zn (NO3)3.6H2O and 10.0846 gram of Al (NO3)3.9H2O, plus Enter 134 ml deionized waters and be mixed to form solution #1.14.6243 grams of sodium hydroxides and 2.4219 grams of sodium carbonate are weighed, 388 are added Ml deionized water, forms solution #2.By in solution #1 and solution #2 pH be 10.5+In the range of 0.5, in 78 C water baths Lower progress co-precipitation operation, and maintain the temperature to stir aging 24 hours.Sediment is washed three times through filtering and deionized water, is put Dried 12 hours in 105 degrees Celsius of baking ovens, obtain houghite presoma, its typical structure is as shown in Figure 1.The presoma It is calcined 4 hours through 700 degrees Celsius, obtains catalyst CDUT-ZC4A, its typical structure is as shown in Figure 2.Through nitrogen adsorption/desorption Experiment, it is 11.24m as a result to show its specific surface area2/g.The weight of the catalyst is constituted:Cobalt oxide content is 14.1%, oxygen It is that 72.2%, alumina content is 13.7% to change Zn content.
Catalyst CDUT-ZC4A is investigated through acetic acid autothermal reforming reaction activity, is 650 degrees Celsius, AC/ in reaction temperature H2O/O2/N2Mol ratio be 1.0/4.0/0.28/3.9, air speed 15000h-1When, in the investigation time of 15 hours, acetic acid turns Rate is 100%, and hydrogen yield is about 3.01 mol-H2/ mol-AC, the selectivity of byproduct methane is close to 0%, and acetone is less than inspection Limit is surveyed, the selectivity of carbon monoxide is stable 26.19%, and the selectivity of carbon dioxide is stable 69.67%;To post catalyst reaction The sign such as XRD, XPS, SEM, TG has been carried out, has as a result been shown, CDUT-ZC4A catalyst has high stability and activity, is due to The crystalline structure and Electronic Performance of the catalyst stabilization, during acetic acid heats reformation hydrogen production, with stronger anti-oxidant and Carbon accumulation resisting ability.
Test result shows that catalyst of the present invention has resistance to sintering, anti-carbon, resistance to oxidation, acetic acid conversion high, active steady The features such as fixed and hydrogen yield is high.

Claims (6)

1. the cobalt-base catalyst for acetic acid self-heating recapitalization hydrogen making, it is characterised in that:Configure cobalt nitrate, zinc nitrate and nitric acid The mixed solution #1 of aluminium;It is 1 according to the total electrical charge and mol ratio hydroxy of metal cation cobalt, zinc and aluminium:8 and carbonate With mol ratio 1 hydroxy:16, the mixed solution #2 of sodium carbonate and sodium hydroxide is prepared, by solution #1 and solution #2 in 65-80 Degree Celsius carry out coprecipitation reaction, control reacting solution pH value 10.5+In the range of 0.5, and maintain stirring in water bath aging 15 ~ 24 hours;Suction filtration, washing three times after, in the baking oven for being placed in 105 degrees Celsius, dry 12 hours, produce Zn-Al houghite forerunners Body sample;It is calcined 4 hours through 500-800 degrees Celsius, produces cobalt-based compound oxide catalyst, its chemical composition is CoaZnbAlO7.5 + δ, wherein a is 0.25-1.00, and b is 0.75-5.00;It is anti-that the catalyst is used for acetic acid self-heating recapitalization hydrogen making Answer process.
2. the cobalt-base catalyst of acetic acid self-heating reforming hydrogen manufacturing according to claim 1, it is characterised in that:The catalyst with The percentage by weight of oxide is constituted:Cobalt oxide 14.0-14.3%, zinc oxide 46.6-76.4%, aluminum oxide 9.5-39.0%.
3. the cobalt-base catalyst of acetic acid self-heating reforming hydrogen manufacturing according to claim 2, it is characterised in that:The catalyst with The percentage by weight of oxide is constituted:Cobalt oxide is 14.2, and zinc oxide is 61.7%, and aluminum oxide is 24.1%.
4. the cobalt-base catalyst of acetic acid self-heating reforming hydrogen manufacturing according to claim 2, it is characterised in that:The catalyst with The percentage by weight of oxide is constituted:Cobalt oxide is 14.1%, and zinc oxide is 68.4%, and aluminum oxide is 17.5%.
5. the cobalt-base catalyst of acetic acid self-heating reforming hydrogen manufacturing according to claim 2, it is characterised in that:The catalyst with The percentage by weight of oxide is constituted:Cobalt oxide is 14.1%, and zinc oxide is 72.2%, and aluminum oxide is 13.7%.
6. the purposes that any one of the claim 1-5 catalyst reacts in acetic acid self-heating reforming hydrogen manufacturing, it is characterised in that:Take Catalyst described in 50-200mg claim any one of 1-5, is passed through flow 20mL/min H2, in 600-800 degrees Celsius also Former 1 hour, purged through nitrogen, be passed through the mol ratio of acetic acid/water/oxygen/nitrogen for 1.0/ (2.5-5.0)/(0.2-0.5)/ In the mixed gas of (2.5-4.5), acetic acid autothermal reforming reaction is carried out by beds, reaction temperature is taken the photograph for 600-800 Family name's degree.
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