Shen Yongjie, Deng Jiang, Han Lupeng, Ren Wei, Zhang Dengsong
State Key Laboratory of Advanced Special Steel, School of Materials Science and Engineering, International Joint Laboratory of Catalytic Chemistry, College of Sciences, Shanghai University, Shanghai 200444, China.
Environ Sci Technol. 2022 Jul 19;56(14):10433-10441. doi: 10.1021/acs.est.2c02866. Epub 2022 Jun 25.
Catalytic combustion of volatile organic compounds (VOCs) at low temperatures is still an urgent issue to be solved. Herein, low-temperature combustion of toluene over Cu-doped SmMnO mullite catalysts via creating highly active Cu-O-Mn sites has been originally demonstrated. Cu-doped SmMnO mullite catalysts exhibited 90% conversion of toluene at 206 °C and displayed robust stability even in the presence of water. It has been demonstrated that Cu doping created Cu-O-Mn active composite sites that were more exposed after removing surface Sm species via acid-etching. Benefiting from this, the redox and oxygen activation ability of catalysts was significantly enhanced. The consumption of benzaldehyde and benzoic acid as intermediate species and the CO generation ability were apparently promoted, which were the direct reasons for the enhanced low-temperature combustion of toluene. This work provides novel ideas for the development of high-performance catalysts for low-temperature VOC combustion, which has great industrial application prospects.
挥发性有机化合物（VOCs）的低温催化燃烧仍是一个亟待解决的问题。在此，首次证明了通过创建高活性的Cu-O-Mn位点，甲苯在Cu掺杂的SmMnO莫来石催化剂上的低温燃烧。Cu掺杂的SmMnO莫来石催化剂在206℃时甲苯转化率达90%，即使在有水存在的情况下也表现出强大的稳定性。已证明Cu掺杂产生了Cu-O-Mn活性复合位点，通过酸蚀去除表面Sm物种后，这些位点更易暴露。受益于此，催化剂的氧化还原和氧活化能力显著增强。作为中间物种的苯甲醛和苯甲酸的消耗以及CO生成能力明显提高，这是甲苯低温燃烧增强的直接原因。这项工作为开发用于低温VOC燃烧的高性能催化剂提供了新思路，具有巨大的工业应用前景。
