文献类型：期刊文献

英文题名：Effect of samarium doping on the activity and sulfur resistance of Ce/MnFeOx catalyst for low-temperature selective catalytic reduction of NOx by ammonia

作者：Zhang, Qiyao[1];Zhang, Shuangshuang[1];Hu, Xu[1];Huang, Yongmin[1]

机构：[1]East China Univ Sci & Technol, Sch Chem & Mol Engn, Key Lab Specially Funct Polymer Mat & Related Tech, Shanghai 200237, Peoples R China

年份：2024

卷号：71

起止页码：272

外文期刊名：CHINESE JOURNAL OF CHEMICAL ENGINEERING

收录：;EI(收录号：20242816684734);WOS:【SCI-EXPANDED(收录号:WOS:001301359000001)】；

基金：This research was supported by the Fundamental Research Funds for the Central Universities (222201817001) and Shanghai Sailing Program (21YF14080 0) . Research Centre of Analysis and Test of ECUST provided analysis assistance.

语种：英文

外文关键词：SCR; Sm doping; Catalyst; Sulfur resistance; In situ DRIFTS; Selectivity

摘要：The self-made MnFeOx catalysts doped with cerium and samarium were prepared by impregnation method for low-temperature selective catalytic reduction (SCR) by NH3. In this work, the surface properties of the series of MnFe-based catalysts were studied. The results indicate Sm-modified catalyst have superior low-temperature SCR activity; NOx conversion maintained at nearby to 100% at 90 degrees C to 240 degrees C. In addition, The N-2 selectivity of Sm doping remains above 80% in the range of 60 degrees C to 150 degrees C. In SO2 poisoning test, the NOx conversion can be remained >90% after 10 h of reaction. The XPS, NH3-TPD and H-2-TPR results show the catalyst with Sm doping enhances the acid sites and oxidation catalytic sites of mixed oxides serves for improving oxygen vacancies and transfer electrons. In situ diffuse reflaxions infrared Fourier transformations spectroscopy (DRIFTS) results show that NOx is more easily adsorbed on the surface after Sm doping, which provided favorable conditions for the NH3-SCR reaction to proceed. The reaction at the catalyst surface will follow the L-H reaction mechanism by transient reaction test.