Dual single-atom Ce-Ti/MnO2 catalyst enhances low-temperature NH3-SCR performance with high H2O and SO2 resistance

被引:30
作者
Song, Jingjing [1 ,2 ]
Liu, Shaomian [2 ]
Ji, Yongjun [3 ]
Xu, Wenqing [2 ]
Yu, Jian [2 ]
Liu, Bing [4 ]
Chen, Wenxing [5 ]
Zhang, Jianling [2 ]
Jia, Lihua [1 ]
Zhu, Tingyu [2 ]
Zhong, Ziyi [6 ,7 ]
Xu, Guangwen [8 ]
Su, Fabing [2 ,8 ]
机构
[1] Qiqihar Univ, Coll Chem & Chem Engn, Qiqihar 161006, Peoples R China
[2] Chinese Acad Sci, Inst Proc Engn, Beijing 100190, Peoples R China
[3] Beijing Technol & Business Univ, Sch Light Ind, Beijing 100048, Peoples R China
[4] Jiangnan Univ, Sch Chem & Mat Engn, Dept Chem Engn, Wuxi 214122, Jiangsu, Peoples R China
[5] Beijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China
[6] Guangdong Technion Israel Inst Technol GTIIT, Dept Chem Engn, Shantou 515063, Peoples R China
[7] Technion Israel Inst Technol IIT, IL-32000 Haifa, Israel
[8] Shenyang Univ Chem Technol, Inst Ind Chem & Energy Technol, Shenyang 110142, Peoples R China
基金
中国国家自然科学基金;
关键词
dual single atom catalyst; Ce-Ti/MnO2; selective catalytic reduction of NOx with NH3 (NH3-SCR); low-temperature performance; H2O- and SO2-resistance; MNOX-CEO2; CATALYSTS; REACTION-MECHANISM; OXIDE CATALYSTS; REDUCTION; NO; NH3; NI; SCR; CO; TOLERANCE;
D O I
10.1007/s12274-022-4790-8
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Mn-based catalysts have exhibited promising performance in low-temperature selective catalytic reduction of NOx with NH3 (NH3-SCR). However, challenges such as H2O- or SO2-induced poisoning to these catalysts still remain. Herein, we report an efficient strategy to prepare the dual single-atom Ce-Ti/MnO2 catalyst via ball-milling and calcination processes to address these issues. Ce-Ti/MnO2 showed better catalytic performance with a higher NO conversion and enhanced H2O- and SO2-resistance at a low-temperature window (100-150 degrees C) than the MnO2, single-atom Ce/MnO2, and Ti/MnO2 catalysts. The in situ infrared Fourier transform spectroscopy analysis confirmed there is no competitive adsorption between NOx and H2O over the Ce-Ti/MnO2 catalyst. The calculation results showed that the synergistic interaction of the neighboring Ce-Ti dual atoms as sacrificial sites weakens the ability of the active Mn sites for binding SO2 and H2O but enhances their binding to NH3. The insight obtained in this work deepens the understanding of catalysis for NH3-SCR. The synthesis strategy developed in this work is easily scaled up to commercialization and applicable to preparing other MnO2-based single-atom catalysts.
引用
收藏
页码:299 / 308
页数:10
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