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Catalyst for preparing carbon monoxide by decomposing carbon dioxide, as well as preparation method and application thereof

A carbon dioxide and carbon monoxide technology, applied in metal/metal oxide/metal hydroxide catalysts, carbon monoxide, physical/chemical process catalysts, etc. problems, to achieve the effect of easy industrial scale-up, lower decomposition temperature, and good performance repeatability

Active Publication Date: 2013-12-25
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problems in these redox systems are: ZnO / Zn is easy to sublimate, and the thermal reduction product Zn vapor must be quenched during the reaction to prevent it from being oxidized again; 3 o 4 / FeO has a low melting point, and the high temperature of thermal reduction can easily deactivate the material by sintering; CeO 2 / C 2 o 3 The thermal reduction rate is lower, which in turn leads to lower CO production, and the reaction temperature is higher
However, in the presence of templates, the high-surface, small-particle materials prepared by the usual co-precipitation method are not thermally stable at high temperatures, and the structure of the material is easily collapsed at high temperatures in thermochemical reactions, thereby deactivating the material

Method used

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  • Catalyst for preparing carbon monoxide by decomposing carbon dioxide, as well as preparation method and application thereof
  • Catalyst for preparing carbon monoxide by decomposing carbon dioxide, as well as preparation method and application thereof
  • Catalyst for preparing carbon monoxide by decomposing carbon dioxide, as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1. Prepare a mixed aqueous solution according to the molar ratio of metal atoms as follows: Ce0.78Zr0.2Mg0.02 (each element is dissolved in deionized water in the form of nitrate to form a mixed aqueous solution), sodium hydroxide is made into 1 mol / L precipitant solution. At 80°C, the two solutions were co-precipitated. The precipitation process needs to be fully stirred to maintain pH = 10, aged at 80°C for 2 hours under stirring conditions, the precipitate was fully washed with deionized water, dried at 80°C and roasted at 800°C for 2 hours. , to obtain the metal oxide catalyst, the metal atom molar ratio of the catalyst is: n(Ce):n(Zr):n(Mg)=0.78:0.2:0.02, which is fully ground. The carbon dioxide decomposition cycle reaction of the catalyst of the present invention is carried out on a fixed-bed reactor. The specific reaction process is as follows: the catalyst is heated up to 1400 °C in an Ar atmosphere for thermal reduction reaction, and the reaction time...

Embodiment 2

[0024]Example 2. Prepare a mixed aqueous solution according to the following molar ratio of metal atoms: Ce0.7Zr0.2Mg0.1 (each element is dissolved in deionized water in the form of nitrate to form a mixed aqueous solution), and potassium hydroxide is made into 0.5 mol / L precipitant solution. At 60°C, the two solutions were co-precipitated. The precipitation process needs to be fully stirred to maintain pH = 8, aged for 6 h under stirring at 60°C, the precipitate was fully washed with deionized water, dried at 100°C and roasted at 700°C After 4 h, the metal oxide catalyst was obtained. The metal atom molar ratio of the catalyst was: n(Ce):n(Zr):n(Mg) = 0.7:0.2:0.1, which was fully ground. The carbon dioxide decomposition cycle reaction of the catalyst of the present invention is carried out on a fixed-bed reactor. The specific reaction process is as follows: the catalyst is heated to 1400 °C in an Ar atmosphere for thermal reduction reaction, and the reaction time is 40 min; ...

Embodiment 3

[0026] Example 3. Prepare a mixed aqueous solution according to the molar ratio of metal atoms as follows: Ce0.75Zr0.2Ca0.05 (each element is dissolved in deionized water in the form of nitrate to form a mixed aqueous solution), ammonia water is made into a 1.5 mol / L precipitant solution. At 50°C, the two solutions were co-precipitated. The precipitation process needs to be fully stirred, and the pH=12 is maintained. Aging is carried out at 50°C for 6 hours. The precipitate is fully washed with deionized water, dried at 120°C and roasted at 600°C for 4 hours. , to obtain the metal oxide catalyst, the metal atom molar ratio of the catalyst is: n(Ce):n(Zr):n(Ca)=0.75:0.2:0.05, which is fully ground. Carbon dioxide pyrolysis cycle reaction conditions are the same as example 2, and the obtained results are as follows:

[0027]

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Abstract

The invention relates to a catalyst for preparing carbon monoxide by decomposing carbon dioxide, which is a composite metal oxide obtained by doping Mg and Ca in a cerium-zirconium solid solution. The chemical composition of the catalyst is expressed by the following general formula: Ce0.8-xZr0.2MxO2-x, wherein x equals 0.02-0.1, M is doping metal Mg or Ca, and x is the molar fraction of the doping metal. The catalyst disclosed by the invention has the advantages of high activity, high thermal stability and long service life.

Description

technical field [0001] The invention belongs to a catalyst, a preparation method and an application, in particular to a catalyst for preparing carbon monoxide by decomposing carbon dioxide in a thermochemical cycle reaction, a preparation method and an application. technical background [0002] The massive consumption of fossil energy has led to massive emissions of CO2. As the most important greenhouse gas, CO2 is also a cheap carbon and oxygen resource, and its chemical utilization has attracted more and more researchers' attention. Thermochemical CO using high temperature solar heat 2 The decomposition cycle reaction can produce CO, and can effectively realize the high-efficiency cascade utilization of solar heat to realize the green synthesis of organic chemicals, so it has gradually become a research hotspot. The reaction principle of this cyclic reaction is: firstly, the thermal reduction reaction of the high-valent metal oxide is carried out at a higher temperature...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10C01B31/18C01B32/40
Inventor 赵宁康敏肖福魁王峰
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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