Lanthanum-doped copper-manganese composite oxide catalyst and preparation method thereof

Abstract

The invention discloses a lanthanum-doped copper-manganese composite oxide catalyst and a preparation method thereof. In the XRD diffraction spectrum of the catalyst, a diffraction peak of Cu1.5Mn1.5O4 spinel phase is contained, and no diffraction peaks of La and Mn2O3 are contained; in the XPS Cu 2p spectrum of the catalyst, two peaks at 933.3+ / -0.1 eV and 930.5+ / -0.1 eV are contained. More reactive oxygen and more active oxygen transport channels are resulted from existence of Cu1.5Mn1.5O4 and weak crystallization of MnOx, and the catalytic performance of the copper-manganese composite oxidecatalyst for VOCs can be improved further through La. The preparation method comprises the following steps: (1) dissolving a manganese salt, a copper salt and a lanthanum salt in water, carrying outwater bath for 0.1-1 h with a water bath temperature at 50-70 DEG C; (2) adding an ammonium salt solution to a pH value of 7.5-8.5, and keeping stirring for 1-3 hours; and (3) taking the precipitate,and then performing drying and sintering so as to obtain the lanthanum-doped copper-manganese composite oxide catalyst. The preparation method of the lanthanum-doped copper-manganese composite oxide catalyst has a simple process, easy control and volume production.

Description

technical field [0001] The invention relates to the technical field of VOCs catalytic combustion, in particular to a lanthanum-doped copper-manganese composite oxide catalyst and a preparation method thereof. Background technique [0002] Most volatile organic compounds (VOCs) are the main cause of air pollution. They are rich in resources, including industrial processes and human activities. Due to the hazards to the atmosphere and human health, most countries are very eager to control the emission of VOCs. Among various technologies, catalytic oxidation is considered to be an effective and economical method to eliminate VOCs. Currently, noble metal catalysts are the most commonly used catalysts because of their good activity in the oxidation of VOCs. However, the wide application of noble metal catalysts in industry is limited by their high price, susceptibility to poisoning and sintering. Therefore, transition metal oxides are considered as a promising alternative and...

AI Technical Summary

Problems solved by technology

However, although copper-manganese oxide catalysts have been studied and improved, they still need to overcome the shortcomings of poor low-temperature catalytic activity and poor thermal stability.

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