文献类型：期刊文献

英文题名：Role of nanosized sheet-like SAPO-34 in bifunctional catalyst for syngas-to-olefins reaction

作者：Huang, Yuxuan[1];Ma, Hongfang[1];Xu, Zhiqiang[1];Qian, Weixin[1];Zhang, Haitao[1];Ying, Weiyong[1]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, Engn Res Ctr Large Scale Reactor Engn & Technol, Minist Educ,State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2020

卷号：273

外文期刊名：FUEL

收录：;EI(收录号：20201508405638);WOS:【SCI-EXPANDED(收录号:WOS:000528188600047)】；

基金：This work is supported by National High Technology Research and Development Plan of China (863 plan, No. 2011AA05A204).

语种：英文

外文关键词：OX-ZEO; Light olefins; Nanosized sheet-like SAPO-34; Carbonaceous species

摘要：Direct conversion of syngas to light olefins via oxide-zeolite strategy attracted extensive attention recently. Nanosized sheet-like SAPO-34, denoted as SAPO-34(NS), was synthesized and utilized as the zeotype in the bifunctional catalyst to enhance the activity of syngas-to-olefins (STO) reaction. SEM and Ar physisorption demonstrated that SAPO-34(NS) exhibited abundant outer cages and facilitated the diffusion of reactant and products. GC-MS revealed that the carbonaceous species in ZnCrOx + SAPO-34(NS) was lighter because of the enhancement of diffusion, thus ZnCrOx + SAPO-34(NS) was more active during STO reaction than the bifunctional catalyst containing micron-sized cubic SAPO-34. The evolution of carbonaceous species in the bifunctional catalyst proved that maintaining tetramethyl-benzenes as the majority of carbonaceous species was benefit to enhance CO conversion in STO reaction over bifunctional catalyst. 18.49% CO conversion and 88.18% light olefins selectivity (free of CO2) were achieved over ZnCrOx + SAPO-34(0.061NS) at 653 K, 1.0 MPa, GHSV = 6000 ml.g(-1).h(-1). The catalytic performance was stable after 6000 min of reaction.