Abstract
Manganese oxide is a cheap catalyst that has found wide application in environmental fields due to its excellent catalytic properties. In this work, we first prepared manganese oxides using a simple redox reaction between K2FeO4 and MnSO4, then applied the prepared MnO2 under different acid treatments (H2SO4, HNO3, HAc), and finally explored the effect of preparation temperature and acid treatment on the performance of the catalytic combustion of dimethyl ether and selective catalytic reduction of NOx with NH3 (NH3-SCR). The results show that the synthesis temperature has a great effect on the crystal phase of the product and the corresponding activity. The product fabricated at room temperature has a mixed phase of α-MnO2 and γ-MnO2, and displays superior performance in the above two catalytic reactions. After acid treatment, the catalytic activity is further improved. The catalytic performance is related to reducibility, surface oxygen species, and the acidity of the MnO2.
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