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 pattern of the catalyst contains Cu 1.5 mn 1.5 o 4 Diffraction peaks of spinel phase without La and Mn 2 o 3 There are two peaks at 933.3±0.1eV and 930.5±0.1eV in the XPS Cu 2p spectrum of the catalyst. Cu 1.5 mn 1.5 o 4 The presence of and the weak crystallization of MnOx lead to more ROS as well as more ROS transport channels. This application uses La to further improve the catalytic performance of copper-manganese composite oxide catalysts for VOCs. The preparation method comprises the following steps: 1) dissolving manganese salt, copper salt and lanthanum salt in water and bathing in water for 0.1-1 hour, the temperature of the water bath is 50-70 DEG C; 2) adding ammonium salt solution until the pH value is 7.5-8.5, and Continue stirring for 1-3 hours; 3) Obtain precipitates, then dry and sinter to obtain a lanthanum-doped copper-manganese composite oxide catalyst. The preparation method of the lanthanum-doped copper-manganese composite oxide catalyst of the present invention has a simple process, is easy to control the process, and can be produced in batches.

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...

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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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