Preparation method for high dispersibility Cu based cerium oxide composite catalyst

Abstract

The invention discloses a preparation method for a high dispersibility Cu based cerium oxide composite catalyst. The preparation method mainly comprises the following steps that (1) a cerium nitrate solution and a 2-methylimidazole solution are prepared separately, the 2-methylimidazole solution is poured into the cerium nitrate solution in the stirring process, and stirring is stopped till the solutions are mixed uniformly; (2) centrifugal separation is conducted, and washing and drying are conducted to obtain a precursor; (3) the precursor obtained in the step (2) and copper salt are ground, methyl alcohol serves as a solvent and volatilizes gradually in the grinding process to form a high dispersibility Cu-based cerium oxide composite catalyst precursor, and the content of Cu in the composite catalyst precursor is, by mass, 0.5-20%; and (4) the composite catalyst precursor is calcined at the atmosphere of H2-Ar mixed gas, and the high dispersibility Cu based cerium oxide composite catalyst is obtained. The composite catalyst prepared through the preparation method has good heat stability, the large specific surface area and the plentiful pore structure, and the composite catalyst has the characteristic of high dispersibility.

Description

technical field [0001] The invention belongs to the fields of resource conversion and utilization and application of hydrogenation catalysts, and in particular relates to a preparation method of a highly dispersed Cu-based cerium oxide composite catalyst. Background technique [0002] With the rapid development of industry, the waste of resources and the increasingly serious environmental pollution, the amount of carbon dioxide emitted by the combustion of fossil fuels and their derivatives has increased sharply, which has seriously affected the living environment of human beings and the global climate. However, carbon dioxide is not a "problem" compound that only causes global warming, it is also an abundant and cheap chemical raw material. Converting carbon dioxide into industrially valuable syngas, methanol, and low-carbon olefins through resource utilization is undoubtedly an ideal way to reduce emissions, and it is also of great significance in promoting the constructio...

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Problems solved by technology

Since the reverse water gas shift reaction is an endothermic reaction, high temperature is conducive to the hydrogenation conversion of carbon dioxide. At present, the reaction temperature of the reverse water gas shift reaction usually needs to be above 600°C, which has high reaction temperature, high energy consumption, and poor thermal stability. Copper-based catalysts are not suitable for reverse water gas shift reaction at high temperature

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