Preparation of MnO2@CeO2 core–shell catalyst and its application in SCO denitration performance
Nitrogen oxides (NOx) could cause acid rain, photochemical smog, and even cause serious harm to human life and health and safety. Therefore, it was urgent to control and reduce NOx. In this paper, CeO 2 with a spherical structure was prepared by hydrothermal method, and the influence of different preparation conditions on the formation of CeO 2 was studied by orthogonal experiments. Then CeO 2 was used as the carrier, and a MnO 2 @CeO 2 core–shell catalyst with MnO 2 as the core and CeO 2 as the shell was developed. And it was successfully applied to SCO denitration. Through SEM, TEM and XRD characterization, the effects of different manganese-cerium ratios and core–shell morphology on the denitration performance were studied. The results showed that: (1) When the concentration of cerium chloride solution was 0.6 mol/L, urea was 30 g, glucose was 40 g, and the hydrothermal temperature is 200 ℃, the prepared CeO 2 catalyst had uniform particle size and high dispersibility. Its catalytic activity was better than that of catalysts prepared under other conditions, and the conversion rate of NO at 250 ℃ was up to 85%; (2) The denitration performance of the MnO 2 @CeO 2 composite3 catalyst was significantly better than that of the CeO 2 catalyst alone. At the same time, the MnO 2 @CeO 2 core–shell catalyst prepared with MnCl 2 ·4H 2 O as the manganese precursor had a better conversion rate of NO than that of the other two manganese precursor catalysts.
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