Insight into the H2S selective catalytic oxidation performance on well-mixed Ce-containing rare earth catalysts derived from MgAlCe layered double hydroxides

	Insight into the H2S selective catalytic oxidation performance on well-mixed Ce-containing rare earth catalysts derived from MgAlCe layered double hydroxides
	Zhang, Fenglian; Zhang, Xin; Hao, Zhengping; Jiang, Guoxia; Yang, Hongling; Qu, Siqiu
	2018-01-15
Source Publication	JOURNAL OF HAZARDOUS MATERIALS
ISSN	0304-3894
Volume	342 Pages:749-757
Abstract	A series of well-mixed Ce-containing MgAlCe rare earth catalysts derived from layered double hydroxides were synthesized and tested for H2S selective catalytic oxidation. Particularly, no chemisorption O-vacancies but intrinsic defect sites were present on catalyst surface. Significantly, the catalysts exhibited excellent catalytic activity, reasonable durability, and outstanding sulfur selectivity (100%) at relatively low temperatures. Furthermore, the catalyst followed a step-wise mechanism, and the catalyst deactivation was due mainly to the slower oxidation rate of Ce3+ to Ce4+ by O-2 as compared to the reduction rate of Ce4+ to Ce3+ by H2S. Particularly, the added water, a Lewis base, can compete with inefficient S-8 catalyst for the occupation of Lewis acid sites and active sites. Meanwhile, it can change the characteristics of catalyst surface, resulting in sulfur existing form transforming from inefficient S-8 catalyst to inactive S3. Thus, lead to a decrease of deposited inefficient S-8 catalyst content. Consequently, decrease the catalytic activity. (C) 2017 Elsevier B.V. All rights reserved.
Department	环境纳米技术与健康效应重点实验室
Keyword	Layered double hydroxides Rare earth catalysts H2S selective oxidation Water effect Catalytic mechanism
Document Type	期刊论文
Identifier	https://ir.rcees.ac.cn/handle/311016/41095
Collection	环境纳米技术与健康效应重点实验室
Recommended Citation GB/T 7714	Zhang, Fenglian,Zhang, Xin,Hao, Zhengping,et al. Insight into the H2S selective catalytic oxidation performance on well-mixed Ce-containing rare earth catalysts derived from MgAlCe layered double hydroxides[J]. JOURNAL OF HAZARDOUS MATERIALS,2018,342:749-757.
APA	Zhang, Fenglian,Zhang, Xin,Hao, Zhengping,Jiang, Guoxia,Yang, Hongling,&Qu, Siqiu.(2018).Insight into the H2S selective catalytic oxidation performance on well-mixed Ce-containing rare earth catalysts derived from MgAlCe layered double hydroxides.JOURNAL OF HAZARDOUS MATERIALS,342,749-757.
MLA	Zhang, Fenglian,et al."Insight into the H2S selective catalytic oxidation performance on well-mixed Ce-containing rare earth catalysts derived from MgAlCe layered double hydroxides".JOURNAL OF HAZARDOUS MATERIALS 342(2018):749-757.

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