The low-temperature catalytic NO removal efficiencies of catalysts with two different manganese precursors, manganese acetate (αMA catalyst) and manganese nitrate (αMN catalyst), were compared and studied. The NH₃-SCR of NO tests using these catalysts were carried out in a self-made reaction device to measure the catalytic activity of the catalysts. Moreover, the reaction pathway analysis of NH₃-SCR of NO on the surface of MnO₂/SiO₂ catalyst and Mn₂O₃/SiO₂ catalyst were performed based on DFT calculations individually. The experimental results show that the NO conversion of αMN catalyst is higher than the αMA catalyst at low temperature (< 180 °C). Besides, the XRD test shows that the main crystal phase is MnO₂ for αMN catalysts, and Mn₂O₃ for αMA catalyst, and the XPS characterization exhibits that the αMN catalyst has the highest MnO₂/Mn₂O₃ ratio. Moreover, DFT calculations indicate that the decompositions of NH₂NO and NHNO are the rate determining steps in the whole NH₃-SCR of NO process and the decomposition activation energy of NH₂OH and NHNO on MnO₂ is lower than that on Mn₂O₃. This is the main reason for the higher NO conversion of catalyst prepared with manganese nitrate as precursor at low temperature.

比较研究了两种锰前驱体乙酸锰（αMA催化剂）和硝酸锰（αMN催化剂）催化剂的低温催化脱氮效率。使用这些催化剂的NH ₃ -SCR的NO测试在自制的反应装置中进行，以测量催化剂的催化活性。此外，对MnO ₂ / SiO ₂催化剂表面的NO和Mn ₂ O ₃ / SiO ₂表面的NH ₃ -SCR反应路径进行了分析。催化剂是根据DFT计算单独进行的。实验结果表明，在低温（<180°C）下，αMN催化剂的NO转化率高于αMA催化剂。此外，XRD测试表明，αMN催化剂的主晶相为MnO ₂，αMA催化剂的主晶相为Mn ₂ O ₃，XPS表征表明αMN催化剂具有最高的MnO ₂ / Mn ₂ O ₃比。此外，DFT计算表明，NH ₂ NO和NHNO的分解是整个NO过程中NH ₃ -SCR的速率决定步骤，也是NH ₂ OH和NHNO在MnO上的分解活化能。₂低于Mn ₂ O ₃。这是在低温下以硝酸锰为前驱体制备的催化剂更高的NO转化率的主要原因。