文献类型：期刊文献

英文题名：Study on surface morphology and selectivity of precipitated iron catalysts of FTS

作者：Wang Xingjun[1];Gao Miao[1];Hong Bingqing[1];Shang Guofeng[1];Li Ping[1];Liu Yu[1];Wang Fuchen[1];Yu Zunhong[1]

机构：[1]Inst Clean Coal Technol ECUST, Minist Educ, Key Lab Coal Gasificat, Shanghai 200237, Peoples R China

年份：2009

卷号：4

期号：5

起止页码：723

外文期刊名：ASIA-PACIFIC JOURNAL OF CHEMICAL ENGINEERING

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000271441300037)】；

基金：This project is supported by Shanghai Leading Academic Discipline Project, Project Number: B506

语种：英文

外文关键词：precipitated iron catalysts; surface morphology; Fischer-Tropsch synthesis; selectivity

摘要：The precipitated iron catalyst was prepared by co-precipitation. The surface morphology of the catalyst was investigated under different reduction conditions by SEM (S-250, USA). Under H-2-reduction, the surface morphology of the catalyst had the obvious changes, which the diameter reduced, adhered together, came into being wads considered as a group. But the surface morphology of the catalyst had almost no change under CO reduction. The crystal structure of the catalyst was studied under different reduction conditions by X-ray diffraction (XRD) (Rigaku D/max, Japanese). It was found that the catalyst was reduced completely with H-2, but it was reduced partly with CO. The crystal structure of the catalyst converted into the metallic phase with H-2 reduction. However, most of the iron converted into iron oxide (Fe3O4) with CO reduction. And the predominant phase in a sample of a mature catalyst is chi-Fe5C2, which is the active phase in the Fischer-Tropsch synthesis (FTS). The experimental results showed that CO conversion and H-2 conversion increase with the change of reaction temperature from 260 to 300 degrees C, under the conditions of pressure P = 2.6 MPa, space velocity = 0.86 NI h(-1) g-Fe-1, n(H-2)/n(CO) = 2/3, and most of the hydrocarbon products are C5-11 which hold half of the hydrocarbon products. The next content is C2-4 which holds the quarter of hydrocarbon products. Then it is C12+, which is equal to 18%. And the last is C-1, which is equal to 7%. (c) 2009 Curtin University of Technology and John Wiley & Sons, Ltd.