Effects of alkali on iron-based catalysts for Fischer-Tropsch synthesis: CO chemisorptions study

被引：44
|
作者：
Li, Jifan [1 ,2 ,3 ]
Cheng, Xiaofan [2 ]
Zhang, Chenghua [1 ,2 ]
Yang, Yong [1 ,2 ]
Li, Yongwang [1 ,2 ]
机构：
[1] Chinese Acad Sci, Inst Coal Chem, State Key Lab Coal Convers, Taiyuan 030001, Peoples R China
[2] Chinese Acad Sci, Inst Coal Chem, Natl Engn Lab Indirect Coal Liquefact, Taiyuan 030001, Peoples R China
[3] Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
来源：
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL | 2015年 / 396卷
基金：
国家高技术研究发展计划(863计划);
关键词：
Alkali promoters; Fischer-Tropsch synthesis; CO pulse experiments; Methane formation; POTASSIUM; ADSORPTION; CARBON; HYDROGENATION; METHANATION; TRANSIENT; SURFACES; KINETICS; PROMOTER; FE(100);
D O I：
10.1016/j.molcata.2014.10.006
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The CO hydrogenation reactions over un-promoted and alkali (Li, Na, K and Rb) promoted iron-based catalysts were studied by pulsing CO method. The pulse experiments indicate that alkali metals suppress the CO hydrogenation or conversion and the methane formation. Through analyzing the data, it is found that alkali promoters decrease the surface concentration of hydrogen, improve the CO adsorption and increase the retention time of carbon species on the catalyst surface in the turn of Li, Na, K, Rb. These promotional effects well explain the hydrocarbon product variation over different alkali promoted catalysts in Fischer-Tropsch synthesis. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码：174 / 180
页数：7
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