Variable-scale CeO2 and CuO composite mesoporous spheres with high specific surface area and preparation method

Abstract

The invention relates to variable-scale CeO2 and CuO composite mesoporous spheres with high specific surface area and a preparation method of the composite mesoporous spheres. The composite mesoporousspheres have low-temperature and high-efficiency catalytic oxidation activity on CO. The preparation method of the CeO2/CuO composite mesoporous spheres comprise steps as follows: (1) firstly, variable-scale CeO2 mesoporous spheres are obtained by adopting Ce(NO3)3 as a Ce source in a C2H6O2 solution and regulating the water content; (2) the CeO2/CuO composite mesoporous spheres are obtained fromCu(NO3)2 as a Cu source, Na2CO3 as a pH regulator and the variable-scale CeO2 mesoporous spheres as carriers with a precipitation-deposition-calcination method. The method has the advantages of beingsimple in process, easy to operate, low in cost and the like; the mesoporous spheres are very suitable for industrial large-scale production and preparation. The obtained CeO2 and CuO composite mesoporous spheres have the advantages that the scale can be effectively regulated in the range of 30-150 nm, and the specific surface area is 100-200 m<2>/g, have the characteristics of being low in complete conversion temperature for catalytic oxidation of CO, high in efficiency, long in service life and the like, and have significant application value in catalytic oxidation of CO, purification of automobile exhaust gas and industrial exhaust gas and the like in the future.

Description

technical field [0001] The invention relates to a CeO with different scales and high specific surface areas that has low-temperature and high-efficiency catalytic oxidation activity for carbon monoxide 2 The invention discloses a / CuO composite mesoporous ball and a preparation method thereof, belonging to the field of preparation of nanocomposite materials. Background technique [0002] Carbon monoxide is a colorless and odorless gaseous pollutant that can combine with human hemoglobin, seriously damage human health and even cause death. With the development of industrial production and the increasing number of automobiles, more and more carbon monoxide is released from incomplete combustion of fossil fuels such as coal, oil, and natural gas. In recent years, especially in winter, the problem of carbon monoxide pollution and poisoning has become increasingly serious, so reduce carbon monoxide emissions It is one of the key environmental pollution problems that people need ...

AI Technical Summary

Problems solved by technology

Cerium dioxide is widely used in the catalytic oxidation of carbon monoxide at high temperature due to its excellent oxygen storage and release capacity, low price and unique lattice structure. However, it is difficult to catalyze the oxidation of carbon monoxide under low temperature conditions (less than 300 degrees).

However, at present, the preparation process of copper-cerium composite oxide mesoporous materials needs to add polyvinylpyrrolidone, cetyltrimethylammonium bromide, alkylamine, acrylic acid, acetic acid, amino acid, block copolymer, mesoporous carbon, Mesoporous silica, carbon-containing polysaccharide spheres, etc. are used as surfactants, inducers, stabilizers or templates, making the preparation and subsequent treatment processes cumbersome and complicated, which is obviously not conducive to large-scale production and application

At the same time, it is difficult to effectively control the scale of copper-cerium composite oxide mesoporous materials in the same reaction system by using the current synthesis process. to report

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