文献类型：期刊文献

英文题名：Effect of the Zr promoter on precipitated iron-based catalysts for high-temperature Fischer-Tropsch synthesis of light olefins

作者：Yang, Yi[1];Qian, Weixin[1];Zhang, Haitao[1];Han, Zhonghao[1];Ma, Hongfang[1];Sun, Qiwen[2];Ying, Weiyong[1]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Sch Chem Engn, Engn Res Ctr Large Scale Reactor Engn & Technol, Shanghai 200237, Peoples R China;[2]State Key Lab Coal Liquefact & Coal Chem Technol, Shanghai 201203, Peoples R China

年份：2022

卷号：12

期号：14

起止页码：4624

外文期刊名：CATALYSIS SCIENCE & TECHNOLOGY

收录：;EI(收录号：20222612263272);WOS:【SCI-EXPANDED(收录号:WOS:000810707100001)】；

基金：We gratefully acknowledge the financial support from the National High Technology Research and Development Plan of China (863 plan, 2011AA05A204) and the Fundamental Research Funds for the Central Universities (No. JKA01211710).

语种：英文

外文关键词：Catalyst selectivity - Dissociation - Fischer-Tropsch synthesis - Hematite - Olefins - Ternary alloys - Zirconia

摘要：FeMnxZr and FeMnxZr2Na catalysts prepared by coprecipitation and impregnation methods were applied to investigate the promoting effects of Zr on iron-based catalysts for high-temperature Fischer-Tropsch synthesis (HTFT). Ar physisorption and TEM demonstrated that Zr-promoted catalysts have a larger BET surface area and larger pore volume, which are more conducive to the distribution of active phases. Zr promoted the dispersity of iron particles and reduced the grain size of iron particles, resulting in the improvement of the FTS activity. The CO-TPD and MES results revealed that the introduction of Zr promoted the dissociative adsorption of CO, thereby promoting the formation of the active phase chi-Fe5C2 while suppressing the formation of epsilon '-Fe2.2C and further improving the FTS activity and the selectivity to C-2(=)-C-4(=) in the hydrocarbon distribution. However, the addition of an excessive amount of Zr caused the excess ZrO2 to cover the surface of the active site, inhibiting the CO dissociative adsorption and the formation of chi-Fe5C2, resulting in a decrease in the CO conversion and the selectivity to C-2(=)-C-4(=). The XPS and H-2-TPR results proved the interaction between Fe2O3 and ZrO2. And the Fe-ZrO2 interaction inhibited the coke deposition and aggregation of the Fe species, as confirmed by XRD and TEM, respectively. The FeMn5Zr2Na catalyst exhibited the highest C-2(=)-C-4(=) selectivity of 34.4% at a CO conversion of 96.3%. And FeMn5Zr2Na displayed the highest production of light olefins (441.6 g h(-1) kg(Cat)(-1)), which was significantly higher than FeMn2Na (162.2 g h(-1) kg(Cat)(-1)).