Promotional effects of Cu and K on precipitated iron-based catalysts for Fischer–Tropsch synthesis

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	Promotional effects of Cu and K on precipitated iron-based catalysts for Fischer–Tropsch synthesis
	Haijun Wan; Baoshan Wu; Chenghua Zhang; Hongwei Xiang; Yongwang Li
	2008
发表期刊	Journal of Molecular Catalysis A: Chemical
卷号	283 期号:1 页码:33–42
其他摘要	The effects of Cu and K promoters on precipitated iron-based Fischer-Tropsch synthesis (FTS) catalysts were investigated by using N-2 physical adsorption, temperature-programmed reduction/desorption (TPR/TPD) and Mossbauer effect spectroscopy (MES). The FTS performances of the catalysts were tested in a slurry-phase continuously stirred tank reactor (CSTR). The characterization results indicated that Cu promoter facilitates the high dispersion of Fe2O3, significantly promotes the reduction and H-2 adsorption, but severely suppresses CO adsorption and the carburization. However, K promoter severely retards the reduction and suppresses the H-2 adsorption, facilitates the CO adsorption and promotes the carburization. In the FTS reaction, it was found that Cu promoter decreases the FFS initial activity and water gas shift (WGS) reaction activity, promotes the oxidation of iron carbides to Fe3O4 and accelerates the deactivation of iron-based catalyst. However, K promoter improves the FTS activity and WGS reaction activity, suppresses the oxidation of iron carbide to Fe3O4 and significantly improves the stability of iron-based catalyst. As compared with individual promotion of Cu or K, the double promotions of Cu and K significantly improve the FTS and WGS activities and keep excellent stability. Due to weaker CO adsorption and stronger H-2 adsorption than the catalysts without Cu, Cu promoted catalysts have higher selectivity to light hydrocarbons and methane and lower selectivity to heavy hydrocarbons. However, the opposite result is obtained on the catalyst incorporated with K promoter.
关键词	Fischer–tropsch Synthesis Iron-based Catalyst Cu Promoter k Promoter
学科领域	热化学转化
收录类别	SCI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.qibebt.ac.cn/handle/337004/406
专题	热化学转化研究组
推荐引用方式 GB/T 7714	Haijun Wan,Baoshan Wu,Chenghua Zhang,等. Promotional effects of Cu and K on precipitated iron-based catalysts for Fischer–Tropsch synthesis[J]. Journal of Molecular Catalysis A: Chemical,2008,283(1):33–42.
APA	Haijun Wan,Baoshan Wu,Chenghua Zhang,Hongwei Xiang,&Yongwang Li.(2008).Promotional effects of Cu and K on precipitated iron-based catalysts for Fischer–Tropsch synthesis.Journal of Molecular Catalysis A: Chemical,283(1),33–42.
MLA	Haijun Wan,et al."Promotional effects of Cu and K on precipitated iron-based catalysts for Fischer–Tropsch synthesis".Journal of Molecular Catalysis A: Chemical 283.1(2008):33–42.

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