Method for preparing supported copper oxide catalyst by using cerium oxide as carrier

Abstract

The invention relates to an ultrasonic assisted method for preparing a supported copper oxide catalyst by using cerium oxide as a carrier. An excess amount of an alkali is added to an aqueous solutionof a copper salt and a cerium salt, and the alkali dissolving process is an exothermic process; the copper salt forms a copper hydroxide precipitate, and is further converted into small copper oxideparticles by using the exothermic process; the cerium salt forms a cerium hydroxide precipitate, and forms cerium oxide having a hole structure in an exothermic environment; the obtained sample is sonicated for a certain period of time to generate local high-temperature and high-pressure "hot spots" in order to promote the copper oxide enter holes of the cerium oxide and form mixed oxides; and centrifugal washing, freeze drying and high temperature calcination are carried out to obtain the final catalyst. The close combination and interaction between copper oxide and the cerium oxide carrier and partial unsaturated coordination of the copper oxide part make defective copper oxide having good redox ability formed, so the complete oxidation of carbon monoxide under hydrogen-rich conditions at a low temperature in a wide window range by the catalyst is achieved.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a preparation method of a supported copper oxide catalyst with cerium oxide as a carrier, and the catalyst can remove trace amounts of carbon monoxide under hydrogen-rich conditions. Background technique: [0002] Proton exchange membrane fuel cell (PEMFC) has attracted more and more attention due to its advantages of low operating temperature, high power density, and long-term operation, especially in the field of residential and automotive power supply. Although hydrogen oxidation produces only water, which is an ideal energy source, the storage and transportation of pure hydrogen limit its application. Therefore, using the water vapor reforming reaction of hydrocarbons to directly obtain hydrogen-rich gas for PEMFC has become a reliable solution. However, the 0.3%-1% by-product CO produced by this reaction will poison the platinum electrode in the battery and affect the efficiency of...

AI Technical Summary

Problems solved by technology

However, compared with other noble metals, the operating temperature for complete conversion of carbon monoxide is high (>100°C), and the window temperature for maintaining complete conversion of carbon monoxide is narrow (5-20°C), which is also an obvious disadvantage of copper catalysts

Therefore, reducing the complete conversion temperature of carbon monoxide and extending the window temperature are the main challenges for copper catalysts.

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