文献类型：期刊文献

英文题名：Oxygen Vacancy-Mediated Selective H2S Oxidation over Co-Doped LaFexCo1-xO3 Perovskite

作者：Yu, Xinlei[1];Tao, Xun[1];Gao, Yunfei[1];Ding, Lu[1];Wang, Yanqin[2];Yu, Guangsuo[1];Wang, Fuchen[1]

机构：[1]East China Univ Sci & Technol, Shanghai Engn Res Ctr Coal Gasificat, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Res Inst Ind Catalysis, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China

年份：2022

卷号：12

期号：2

外文期刊名：CATALYSTS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000767730800001)】；

基金：FundingThis research was funded by the National Natural Science Foundation of China, grant number 21978092.

语种：英文

外文关键词：hydrogen sulfide; selective oxidation; perovskite oxides; oxygen vacancy

摘要：Compared to the Claus process, selective H2S catalytic oxidation to sulfur is a promising reaction, as it is not subject to thermodynamic limitations and could theoretically achieve ~100% H2S conversion to sulfur. In this study, we investigated the effects of Co and Fe co-doping in ABO(3) perovskite on H2S selective catalytic oxidation. A series of LaFexCo1-xO3 (x = 0, 0.2, 0.4, 0.6, 0.8, 1.0) perovskites were synthesized by the sol-gel method. Compared to LaFeO3 and LaCoO3, co-doped LaFexCo1-xO3 significantly improved the H2S conversion and sulfur selectivity at a lower reaction temperature. Nearly 100% sulfur yield was achieved on LaFe0.4Co0.6O3 under 220 degrees C with exceptional catalyst stability (above 95% sulfur yield after 77 h). The catalysts were characterized by XRD, BET, FTIR, XPS, and H-2-TPR. The characterization results showed that the structure of LaFexCo1-xO3 changed from the rhombic phase of LaCoO3 to the cubic phase of LaFeO3 with Fe substitution. Doping with appropriate iron (x = 0.4) facilitates the reduction of Co ions in the catalyst, thereby promoting the H2S selective oxidation. This study demonstrates a promising approach for low-temperature H2S combustion with ~100% sulfur yield.