文献类型：期刊文献

英文题名：Selective catalytic reduction of NOx with NH3 over short-range ordered W-O-Fe structures with high thermal stability

作者：Xin, Ying[1];Zhang, Nana[1];Li, Qian[1];Zhang, Zhaoliang[1];Cao, Xiaoming[2];Zheng, Lirong[3];Zeng, Yuewu[4,5];Anderson, James A.[6]

机构：[1]Univ Jinan, Shandong Prov Key Lab Fluorine Chem & Chem Mat, Sch Chem & Chem Engn, Jinan 250022, Shandong, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem & Mol Engn, Ctr Computat Chem, Shanghai 200237, Peoples R China;[3]Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China;[4]Zhejiang Univ, Ctr Electron Microscopy, Hangzhou 310027, Zhejiang, Peoples R China;[5]Zhejiang Univ, State Key Lab Silicon Mat, Hangzhou 310027, Zhejiang, Peoples R China;[6]Univ Aberdeen, Surface Chem & Catalysis Grp, Mat & Chem Engn, Aberdeen AB24 3UE, Scotland

年份：2018

卷号：229

起止页码：81

外文期刊名：APPLIED CATALYSIS B-ENVIRONMENTAL

收录：;EI(收录号：20180804813454);WOS:【SCI-EXPANDED(收录号:WOS:000428488600010)】；

基金：This work was supported by National Natural Science Foundation of China (Nos. 21477046, 21333003, and 21673072) and Key Technology R&D Program of Shandong Province (No. 2016ZDJS11A03).

语种：英文

外文关键词：Nitrogen oxides; Selective catalytic reduction; Ammonia; Short-range order; High thermal stability

摘要：The selective catalytic reduction (SCR) of NOx with NH3 was studied over poorly-crystalline W-Fe composite oxides (WaFeOx). The short-range order present within the W-O-Fe structure was found to be responsible for the excellent SCR activity, in which the strong atomic-level interaction between Fe and W atoms promoted the formation of both Lewis and Bronsted acidity. The W-O-Fe structure existed as amorphous overlayers, approximately 2 nm thick over the surface of crystalline particles after high-temperature aging as shown by high-angle annular dark field scanning transmission electron microscopy (lAADF-STEM). After treatment at 800 degrees C for 5 h, the WaFeOx catalysts still showed almost 100% NO conversion in the range 300-450 degrees C with 100% N-2 selectivity, despite the loss in surface area. This resistance to the impacts of high temperature ageing guarantees high activity of SCR catalysts which often suffer during high-temperature excursions as in the case of diesel exhaust due to diesel particulate filter (DPF) regeneration.