Preparation method of high-specific-surface CuMn2O4 catalyst for CO low-temperature oxidation removal

Abstract

The invention discloses a preparation method of a high-specific-surface CuMn2O4 catalyst for CO low-temperature oxidation removal. The method comprises the steps that soluble copper salt and soluble manganese salt with the mole ratio being 1:2 are prepared into a solution with the total mole concentration of 0.21-0.45 mol / L, then, an ammonium oxalate solution with the mole concentration of 0.3-0.5 mol / L is added, the mixture continues to be stirred and is dried at the temperature of 60-90 DEG C after being precipitated and washed to obtain a copper manganese oxalate precursor, and the copper manganese oxalate precursor is heated at the heating speed of 0.5-2 DEG C / min to 300-400 DEG C to be roasted for 0.5-3 h to obtain the spinel type CuMn2O4 catalyst. The prepared CuMn2O4 catalyst has the advantages of being large in specific surface, simple in preparation process, convenient to operate, good in repeatability and the like, can achieve oxidization removal of CO in air within the wide temperature range, and has the quite good stability.

Description

technical field [0001] The invention belongs to the technical field of heterogeneous catalysis, and in particular relates to a high specific surface CuMn used for low-temperature oxidation and elimination of CO 2 o 4 Catalyst preparation method. Background technique [0002] Carbon monoxide (CO) oxidative elimination is a widely used reaction in practice, involving many aspects such as industry, environmental protection, military affairs and human life, such as: gas purification in CO lasers, CO gas detector materials, gas purification for breathing Devices, tobacco harm reduction, closed systems (such as aircraft, submarines, spacecraft, etc.) and the elimination of trace CO in automobile exhaust, etc. Among them, the low-temperature catalytic oxidation method is the simplest, cheapest, most direct and most effective method to eliminate CO. At present, the industry mainly uses noble metal catalysts (such as Pd, Pt, Au, etc.) with high catalytic activity, good heat resist...

AI Technical Summary

Problems solved by technology

The main problem at present is that the copper-manganese composite oxides prepared by traditional impregnation and co-precipitation methods are difficult to ensure the full mixing of multiple components, except for spinel CuMn 2 o 4 In addition, it is easy to generate CuO or MnO x The crystal phase seriously affects the activity and stability of the catalyst; a single spinel CuMn can be obtained by using sol-gel technology 2 o 4 phase, but the prepared CuMn 2 o 4 The specific area of ​​the catalyst is relatively low (≤50m 2 / g), it is difficult to meet the demand for high catalytic activity in practical applications

However, the disadvantage of this method is that the manufacturing equipment and operation are relatively complicated, and it is difficult to realize large-scale industrial production.

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