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Catalyst for catalyzing methane dry-reforming reaction as well as preparation method and application of catalyst

A methane dry reforming and catalyst technology, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, molecular sieve catalyst, etc., can solve the problems of inability to fully utilize precious metals to inhibit carbonization stability, low utilization rate of precious metals, etc., to achieve preparation The conditions are easy to control accurately, good economic benefits, and the effect of large industrial value

Inactive Publication Date: 2017-10-24
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are two problems in the commonly used bimetallic catalysts: 1. The preparation method is a co-impregnation method. The specific process is to mix the two metal salt solutions of A and B with a certain amount of carrier C in a certain ratio, and with vigorous stirring, and finally Evaporation, drying, and roasting, the catalyst prepared by this method is due to the bulk phase doping of the two metals A and B, and the utilization rate of the noble metal is low, which cannot fully exert the ability of the noble metal to inhibit carbon formation, improve activity, and enhance stability; 2. The doping amount of noble metal is more than 0.1%

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: the preparation of catalyst

[0029] Rh-Ni / SBA-15 catalyst was prepared by impregnation-replacement method. The specific steps are as follows: by adding a certain mass of SBA-15 to 0.001-0.003g / ml Ni(NO 3 ) 2 After dipping and stirring in the solution for 2 hours, the solution was evaporated to dryness in a water bath at 90°C, dried at 105°C, and roasted in a muffle furnace at 550°C for 5 hours for later use. The Ni / SBA-15 prepared by the impregnation method was reduced at 550 °C for 2 h in a hydrogen atmosphere, and then transferred to an inert gas atmosphere. Under an inert gas atmosphere, a certain amount of Ni / SBA-15 was added to deionized water, and while stirring vigorously, a certain volume of 0.001-0.003g / ml deoxygenated Rh(NO 3 ) 3 solution, after the dropwise addition was completed, the obtained suspension was stirred for 1.5 h, then the suspension was filtered and washed several times with deionized water, and the obtained material was dried...

Embodiment 2

[0032] Example 2: Catalyst activity and stability

[0033] The Rh-Ni / SBA-15 catalyst prepared by the impregnation-replacement method according to Example 1, wherein the loading amount of Ni is 5wt%, and the loading amount of Rh is 0.01wt%. The above-mentioned catalyst is used to catalyze the methane dry reforming reaction. The amount of catalyst used is 50mg, and the space velocity is 72000ml / h -1 g -1 , the reaction temperature is 500-800°C, CH 4 :CO 2 =1:1, the total flow rate of the mixed gas is 60ml / min, the stability test is carried out at 700°C for 10h under normal pressure, and the reactants and products are detected online by a gas chromatograph equipped with a TCD detector. The activity result of the catalytic reaction is that at 800°C, CH 4 The conversion rate is 80%, CO 2 The conversion rate is 100%. The stability result of the catalytic reaction is CH at 10h 4 The conversion rate is 55%, CO 2 The conversion rate of H 2 The ratio (molar ratio) of / CO was 0...

Embodiment 3

[0040] The Rh-Ni / SBA-15 catalyst was prepared by the impregnation-replacement method, in which the loading amount of Ni was 5wt%, and the loading amount of Rh was 0.1wt%. The above-mentioned catalyst is used to catalyze the methane dry reforming reaction. The amount of catalyst used is 50mg, and the space velocity is 72000ml / h -1 g -1 , the reaction temperature of activity test is 500-800℃, CH 4 :CO 2 =1:1, the total flow rate of the mixed gas is 60ml / min, the stability test is performed under normal pressure for 10h, and the reactants and products are detected online by a gas chromatograph equipped with a TCD detector. The activity result of the catalytic reaction is that at 800°C, CH 4 The conversion rate is 64%, CO 2 The conversion rate was 74%. The stability result of the catalytic reaction is CH at 10h 4 The conversion rate is 50%, CO 2 The conversion rate of H 2 The ratio (molar ratio) of / CO was 0.76.

[0041] Compared with the catalyst in Example 2, when the ...

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Abstract

The invention belongs to the field of chemical engineering and catalyst preparation and relates to a catalyst for catalyzing a methane dry-reforming reaction as well as a preparation method and an application of the catalyst. The catalyst for catalyzing the methane dry-reforming reaction adopts oxide as a carrier C to carry metals A and B with an impregnation method and a redox replacement method, and a B-A / C catalyst is obtained. The invention further provides the preparation method and the application of the catalyst for catalyzing the methane dry-reforming reaction. The B-A / C catalyst performs reforming catalysis for CH4 and CO2 in a gas phase, and synthesis gas of H2 and CO is produced. The B-A / C catalyst prepared with the impregnation-replacement method shows an obvious effect on catalysis of the methane dry-reforming reaction, the obtained H2 / CO content is higher than 80%, and the yield of hydrocarbon in a follow-up Fischer-Tropsch reaction is increased; the conversion rate of a reactant is increased and the stability of the catalyst is enhanced.

Description

technical field [0001] The invention relates to a preparation method of a supported noble metal catalyst, in particular to a catalyst capable of catalyzing methane dry reforming reaction, a preparation method of the catalyst, and an application of the catalyst to methane dry reforming catalysis. Background technique [0002] At present, with the rapid development of the economy, a large amount of pollutants enter the environment, which makes the environmental problems more and more serious. Global warming is one of the main environmental problems faced by the industrialized society. The two most important greenhouse gases contributing to global warming are CH 4 and CO 2 , where CH 4 Greenhouse Effect than CO 2 25 times larger. Global warming will have an impact on natural ecosystems and the climate, such as melting glaciers, rising sea levels, declining biodiversity, and increasing atmospheric turbulence. [0003] The measures taken for global warming are mainly emissio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/03C01B3/38
CPCC01B3/38B01J29/0333B01J37/0201B01J37/16B01J37/18C01B2203/1064C01B2203/1058C01B2203/1041C01B2203/1241C01B2203/1082C01B2203/0238B01J2229/18Y02P20/52
Inventor 郑寿荣宁欣许昭怡吴可孙静雅李明会刘慧张海鹏杨莎莎
Owner NANJING UNIV
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