Wu Peng, Zhao Shuaiqi, Yu Jiawen, Jin Xiaojing, Ye Daiqi, Yang Shihe, Qiu Yongcai
Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, School of Environment and Energy, South China University of Technology, Guangzhou 510006, China.
Guangzhou International Economics College, No.28 Dayuanbei, Baiyun District, Guangzhou, Guangdong 510540, China.
ACS Appl Mater Interfaces. 2020 Nov 11;12(45):50566-50572. doi: 10.1021/acsami.0c17042. Epub 2020 Oct 30.
Manganese oxides have displayed vast potential for future development in the field of catalytic abatement of volatile organic compounds (VOCs) because of their low cost, high stability, and enhanced catalytic activity. Manganese sulfate and manganese chloride are widely used as reaction sources to prepare manganese oxides. As reported, absorbed chloride usually affects the performance of catalysts. However, the effect of absorbed sulfate on catalysts has been overlooked at present. Herein, the poisoning effect of absorbed sulfate on MnO catalyst in the catalytic oxidation of VOCs has been uncovered. Manganese sulfate-derived MnO catalyst exhibits a significantly enhanced performance after repeated washing by water, which indicates that absorbed sulfate has an adverse effect on MnO catalyst for removal of VOCs. The blocking of the surface oxygen species and active sites is considered as the reason for sulfate poisoning. Hence, elimination of absorbed sulfate by thorough washing or other effective method is essential for preparing high-performance manganese sulfate-derived manganese oxide catalysts.
由于成本低、稳定性高且催化活性增强，氧化锰在挥发性有机化合物（VOCs）催化消除领域展现出巨大的未来发展潜力。硫酸锰和氯化锰被广泛用作制备氧化锰的反应源。据报道，吸附的氯通常会影响催化剂的性能。然而，目前吸附的硫酸盐对催化剂的影响却被忽视了。在此，已揭示了吸附的硫酸盐在VOCs催化氧化中对MnO催化剂的中毒作用。经水反复洗涤后，硫酸锰衍生的MnO催化剂表现出显著增强的性能，这表明吸附的硫酸盐对用于去除VOCs的MnO催化剂有不利影响。表面氧物种和活性位点的阻塞被认为是硫酸盐中毒的原因。因此，通过彻底洗涤或其他有效方法消除吸附的硫酸盐对于制备高性能硫酸锰衍生的氧化锰催化剂至关重要。
