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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 PublicationJOURNAL OF HAZARDOUS MATERIALS
ISSN0304-3894
Volume342Pages:749-757
AbstractA 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
KeywordLayered double hydroxides Rare earth catalysts H2S selective oxidation Water effect Catalytic mechanism
Document Type期刊论文
Identifierhttps://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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