Effects of K and Mn promoters over Fe2O3 on Fischer-Tropsch synthesis

• 作者: Dong Gu Jing Zhou Teng Lv Wei Weng Wei Xiao
• 来源期刊: 能源化学
• 年，卷（期）: 2020,（8）
• 页码范围: 118-127
• 页数: 10页
• 语种: 英文

摘要

Structural and compositional design of core-shell structure is an effective strategy towards enhanced catalysis.Herein,amorphous MnO2 nanosheets and K+-intercalated layered MnO2 nanosheets are controllably assembled over Fe2O3 spindles,in which the MnO2 nanosheets are perpendicularly anchored to the surface of Fe2O3.Such a core shell structure contributes to a high specific surface area and abundant pore channels on the surface of catalysts.In addition,the existence of K+ provides large numbers of basic sites and restrains the formation of unpleasant (Fe1-xMnx)3O4.Benefiting from the merits in structure and composition,CO adsorption is enhanced and remaining time of intermediates is prolonged on the surfaces of catalysts during the Fischer-Tropsch synthesis (FTS),facilitating to the formation of active iron carbides and C-C coupling reactions.Resultantly,the Fe2O3@K+-MnO2 shows both a high CO conversion of 82.3％ and a high Cs+ selectivity of 73.1％.The present study provides structural and compositional rationales on design high-performance catalysts towards FTS.