A kind of chemical looping cycle hydrogen production catalyst and its preparation method and application

A catalyst and chemical chain technology, applied in the field of core-shell composite oxide oxygen carrier catalyst and its preparation, chemical chain cycle hydrogen production catalyst and its preparation, can solve the problem of limited oxygen loading rate, high reaction temperature, unbearable etc. problem, achieve strong oxygen storage capacity, increase oxygen loading rate and activity, and improve selectivity

Active Publication Date: 2017-01-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Relatively speaking, the oxygen carrier NiO / NiAl 2 o 4 (CHO P etc. Fuel, 2004, 83(9)), Fe 2 o 3 / Al 2 o 3 (MATTISSONT etc. Fuel, 2001, 80 (13)) and CoO-NiO / YSZ (JIN H G etc. Energy Fuels, 1998, 12 (6)) have better overall performance, but there are limited oxygen loading rates and cyclic reactivity Low, unable to withstand high reaction temperature, low dispersion of metal oxides in oxygen carrier, etc.

Method used

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  • A kind of chemical looping cycle hydrogen production catalyst and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Carrier preparation: first, monodisperse microporous silica microspheres were prepared by sol-gel method, using ethyl orthosilicate, absolute ethanol and distilled water as raw materials, and acid as catalyst to obtain silica sol, which was Put it in a 120°C oven for gelation, and slowly dry it for 2 weeks to obtain a xerogel; then heat-treat the xerogel at a temperature of 650°C to obtain a silica mesoporous microspherical solid; the acid used for the catalyst can be hydrochloric acid , nitric acid; the molar ratio of acid to silicon is 1:2, the molar ratio of tetraethyl orthosilicate to water is 1:10, and the molar ratio of tetraethyl orthosilicate and ethanol is 1:4, and the acid gel method is used simultaneously Prepare a stable zinc oxide sol; ultrasonically disperse the prepared silica microspheres in distilled water to make a suspension, adjust the acidity of the suspension with nitric acid to make its pH equal to that of the prepared zinc oxide sol, and then Add...

Embodiment 2

[0027] Carrier preparation: first, monodisperse microporous silica microspheres were prepared by sol-gel method, using ethyl orthosilicate, absolute ethanol and distilled water as raw materials, and acid as catalyst to obtain silica sol, which was Put it in a 120°C oven for gelation, and slowly dry it for 2 weeks to obtain a xerogel; then heat-treat the xerogel at a temperature of 400°C~750°C to obtain a mesoporous silica microspherical solid; the acid used in the catalyst It can be hydrochloric acid or nitric acid; the molar ratio of acid to silicon is 1:2, the molar ratio of tetraethyl orthosilicate to water is 1:15, and the molar ratio of tetraethyl orthosilicate to ethanol is 1:3. Prepare a stable zinc oxide sol by degelation method; ultrasonically disperse the prepared silica microspheres in distilled water to make a suspension, and adjust the acidity of the suspension with nitric acid to make its pH value equal to that of the prepared zinc oxide sol equal, then add the p...

Embodiment 3

[0033] Carrier preparation: first, monodisperse microporous silica microspheres were prepared by sol-gel method, using ethyl orthosilicate, absolute ethanol and distilled water as raw materials, and acid as catalyst to obtain silica sol, which was Put it in a 120°C oven for gelation, and slowly dry it for 3 weeks to obtain a xerogel; then heat-treat the xerogel at a temperature of 400°C~750°C to obtain a mesoporous silica microspherical solid; the acid used in the catalyst It can be hydrochloric acid or nitric acid; the molar ratio of acid to silicon is 1:2, the molar ratio of tetraethyl orthosilicate to water is 1:12, and the molar ratio of tetraethyl orthosilicate to ethanol is 1:5. Prepare a stable zinc oxide sol by degelation method; ultrasonically disperse the prepared silica microspheres in distilled water to make a suspension, and adjust the acidity of the suspension with nitric acid to make its pH value equal to that of the prepared zinc oxide sol equal, then add the p...

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Abstract

The invention discloses a catalyst for chemical looping hydrogen generation as well as a preparation method and application of the catalyst. For the catalyst for the chemical looping hydrogen generation, porous nano composite particles of zinc oxide and silicon oxide are used as carriers, Co loaded by a dipping method is used as an active component, Ce is used as an auxiliary agent, and the final catalyst comprises the following elements in percentage by weight: 5-30% of Co, and 0.1-3% of Ce. For the catalyst for the chemical looping hydrogen generation, the reaction temperature in fuels is 500-1250 DEG C, and the reaction temperature in vapor is 500-1250 DEG C. The catalyst for the chemical looping hydrogen generation, which is disclosed by the invention, has the advantages of high oxygen carrying rate, high catalytic activity, high resistance to carbon deposition, high resistance to high-temperature sintering, and high stability.

Description

technical field [0001] The invention relates to a chemical chain cycle hydrogen production catalyst and its preparation method and application, in particular to a core-shell composite oxide oxygen carrier catalyst and its preparation method and application, belonging to the field of chemical chain hydrogen production. Background technique [0002] In 1983, German scientists Richter and Knoche first proposed the concept of chemical looping combustion (CLC). The biggest difference between this combustion technology and the usual combustion technology is that it does not directly use the oxygen molecules in the air, but uses the oxygen atoms in the oxygen carrier to complete the combustion process of the fuel, and the combustion products (mainly CO 2 and water vapor) will not be diluted by nitrogen in the air and the concentration is extremely high, and almost pure CO can be obtained by simple condensation 2 , simple and low energy consumption to achieve CO 2 In addition, due...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/83B01J23/80C01B3/02
Inventor 倪向前梁皓张舒冬尹泽群
Owner CHINA PETROLEUM & CHEM CORP
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