Catalyst, preparation method and application of carbon dioxide decomposition to prepare carbon monoxide

A carbon monoxide and carbon dioxide technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, carbon monoxide, physical/chemical process catalyst, etc., can solve the problem of not having high temperature thermal stability, easy collapse of material structure, material sintering deactivation, etc. problems, to achieve the effect of easy industrial scale-up, lower decomposition temperature, and good performance repeatability

Active Publication Date: 2015-08-19
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, preparation method and application of carbon dioxide decomposition to prepare carbon monoxide
  • Catalyst, preparation method and application of carbon dioxide decomposition to prepare carbon monoxide
  • Catalyst, preparation method and application of carbon dioxide decomposition to prepare carbon monoxide

Examples

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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 Patents(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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