文献类型：期刊文献

英文题名：Rational co-introduction of K-Ce ions into OMS-2 tunnels to promote oxygen vacancies and Bronsted acid sites for enhanced NH3-SCO

作者：Hong, Wei[1] Zhu, Tianle[2] Liu, Yang[2] Zeng, Fangang[3] Sun, Ye[4] Wang, Haining[4] Fu, Zongying[1] Lu, Yun[1]

第一作者：Hong, Wei

通信作者：Zeng, FA[1]

机构：[1]Chinese Acad Forestry, Res Inst Wood Ind, Beijing 100091, Peoples R China;[2]Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China;[3]Renmin Univ China, Sch Chem & Life Resource, Beijing 100872, Peoples R China;[4]Beihang Univ, Sch Energy & Power Engn, Beijing 100191, Peoples R China

年份：2025

卷号：372

外文期刊名：APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001462324700001)】；

基金：This work was financially supported by Beijing Natural Science Foundation (2254083) , National Key Research and Development Program of China (2023YFC3708400) , China Postdoctoral Science Foundation (2023T160042 and 2022M710301) , and High Performance Computing (HPC) Resources at Beihang University.

语种：英文

外文关键词：OMS-2; Oxygen vacancies; Bronsted acid sites; NH3 -SCO; K-Ce ion co-introduction

摘要：Mn-based catalysts hold significant promise for practical applications in NH3-SCO; however, improving NH3 conversion and N-2 selectivity at low temperatures (<200 degrees C) remains a challenge. Here, an innovative OMS-2 catalyst co-doped with K and Ce ions within its 2 x 2 tunnel frameworks was synthesized and applied for NH3-SCO. Characterization and DFT calculations revealed that the co-introduction of K-Ce ions into the OMS-2 tunnels facilitated the formation of oxygen vacancies and Bronsted acid sites, enhancing NH3 adsorption on the catalyst surface. Further analysis showed that this co-doping strategy also increased the catalyst's specific surface area, reducibility, and surface acidity. As a result, the K-Ce-OMS-2 catalyst, with K and Ce contents of 6.46 % and 11.76 %, respectively, exhibited excellent NH3 conversion and N-2 selectivity in NH3-SCO. Additionally, a possible NH3-SCO mechanism elucidating the roles of oxygen vacancies and Br & ouml;nsted acid sites in promoting NH3 conversion and N-2 selectivity over the K-Ce-OMS-2 catalyst was proposed.