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Tailoring the Electronic Structure of Single Ag Atoms in Ag/WO3 for Efficient NO Reduction by CO in the Presence of O2

文献类型：期刊论文

作者Ji, Yongjun1; Chen, Xiaoli1; Liu, Shaomian2; Song, Shaojia3; Xu, Wenqing2; Jiang, Ruihuan2,5; Chen, Wenxing6; Li, Huifang2; Zhu, Tingyu2; Li, Zhenxing3
刊名ACS CATALYSIS
出版日期2023-01-05
页码1230-1239
ISSN号2155-5435
关键词local-structure control Ag single atoms CO-SCR catalytic performance O2 resistance
DOI10.1021/acscatal.2c05048
英文摘要Developing efficient catalysts for the selective catalytic reduction of NOx by CO (CO-SCR) is the key challenge for commercializing this technology. Ag-based catalysts with relatively low costs are promising but widely believed to be not efficient enough for this reaction. Here, we demonstrate that atomically dispersed Ag supported on ordered mesoporous WO3 (mWO3) can serve as a highly active catalyst for CO-SCR under O2-containing conditions. By altering the amount of the Ag precursor, the local environment of the Ag atom coordinated with the O atom can be tailored. Furthermore, at 250 degrees C and an O2/CO ratio of 2.5:1, 0.3Ag/m-WO3 (0.3 wt % Ag) with six-coordinated Ag-O exhibited much better catalytic performance than 5 Ag/m-WO3 (5 wt % Ag) with two coordinated Ag-O (e.g., 0.43 vs 0.02 molNO gAg -1 h-1 in the reaction rate) and previously reported Ag-based catalysts in the literature. The theoretical calculations confirm that the six-coordinated Ag atoms in 0.3Ag/m-WO3 possess a more positive oxidation state and a higher d-band center than the two-coordinated Ag atoms in 5Ag/m-WO3, promoting its bonding strength with co adsorption of the critical intermediates of N2O* and CO*. This work provides a feasible route for regulating the local environment of a Ag single atomic catalyst to enhance its catalytic property for CO-SCR.
WOS关键词SELECTIVE CATALYTIC-REDUCTION ; SITU FTIR SPECTROSCOPY ; NITRIC-OXIDE ; PERFORMANCE ; REGENERATOR ; ADDITIVES ; SCR
资助项目National Natural Science Foundation of China[21978299] ; National Natural Science Foundation of China[52222005] ; National Natural Science Foundation of China[52070180] ; National Natural Science Foundation of China[51938014] ; Beijing Chenxi Environmental Engineering Co., Ltd. ; 2020 Li Ka Shing Foundation Cross-Disciplinary Research Grant[2020LKSFG09A] ; Guang-dong Key discipline fund (2022) ; Research Foundation for Advanced Talents of Beijing Technology and Business University[19008020159] ; Beijing Technology and Business University[19008022056]
WOS研究方向Chemistry
语种英语
出版者AMER CHEMICAL SOC
WOS记录号WOS:000911962600001
资助机构National Natural Science Foundation of China ; Beijing Chenxi Environmental Engineering Co., Ltd. ; 2020 Li Ka Shing Foundation Cross-Disciplinary Research Grant ; Guang-dong Key discipline fund (2022) ; Research Foundation for Advanced Talents of Beijing Technology and Business University ; Beijing Technology and Business University
源URL[http://ir.ipe.ac.cn/handle/122111/56542]  
专题中国科学院过程工程研究所
通讯作者Ji, Yongjun; Xu, Wenqing; Li, Zhenxing; Su, Fabing
作者单位1.Beijing Technol & Business Univ, Sch Light Ind, Beijing 100048, Peoples R China
2.Chinese Acad Sci, Inst Proc Engn, Beijing 100190, Peoples R China
3.China Univ Petr, State Key Lab Heavy Oil Proc, Beijing 102249, Peoples R China
4.Shenyang Univ Chem Technol, Inst Ind Chem & Energy Technol, Shenyang 110142, Peoples R China
5.Qiqihar Univ, Coll Chem & Chem Engn, Qiqihar 161006, Heilongjiang, Peoples R China
6.Beijing Inst Technol, Energy & Catalysis Ctr, Sch Mat Sci & Engn, Beijing 100081, Peoples R China
7.Guangdong Technion Israel Inst Technol GTIIT, Dept Chem Engn, Shantou 515063, Peoples R China
8.Technion Israel Inst Technol IIT, IL-32000 Haifa, Israel
9.Tsinghua Univ, Dept Chem, Beijing 100084, Peoples R China
推荐引用方式
GB/T 7714		 Ji, Yongjun,Chen, Xiaoli,Liu, Shaomian,et al. Tailoring the Electronic Structure of Single Ag Atoms in Ag/WO3 for Efficient NO Reduction by CO in the Presence of O2[J]. ACS CATALYSIS,2023:1230-1239.
APA Ji, Yongjun.,Chen, Xiaoli.,Liu, Shaomian.,Song, Shaojia.,Xu, Wenqing.,...&Su, Fabing.(2023).Tailoring the Electronic Structure of Single Ag Atoms in Ag/WO3 for Efficient NO Reduction by CO in the Presence of O2.ACS CATALYSIS,1230-1239.
MLA Ji, Yongjun,et al."Tailoring the Electronic Structure of Single Ag Atoms in Ag/WO3 for Efficient NO Reduction by CO in the Presence of O2".ACS CATALYSIS (2023):1230-1239.

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来源：过程工程研究所

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