Enhanced ethylene selectivity and stability of Mo/ZSM5 upon modification with phosphorus in ethane dehydrogenation

doi:10.1016/j.jcat.2017.12.023

	Enhanced ethylene selectivity and stability of Mo/ZSM5 upon modification with phosphorus in ethane dehydrogenation
	Pan, Xiulian 1; Ji, Zhonghai 1,2; Lv, Houfu 1,2; Bao, Xinhe 1
刊名	JOURNAL OF CATALYSIS
	2018-05-01
卷号	361 页码:94-104
关键词	Dehydrogenation Mo/zsm5 Stability Coke Shape Selective
ISSN号	0021-9517
DOI	10.1016/j.jcat.2017.12.023
文献子类	Article
英文摘要	Nonoxidative conversion of ethane to ethylene and/or BTX (benzene, toluene, and xylene) suffers rapid deactivation due to coke deposition. We report here the effects of phosphorus modification on the stability and activity of Mo/ZSM5 for nonoxidative conversion of ethane. The results show that the ethylene and BTX yield and stability are significantly enhanced upon modification with 2.5 wt.% P center dot NH3OP TPD, pyridine FTIR, H-1 MAS NMR, (27)AI MAS NMR, P-31 MAS NMR, Xe-129 NMR, XPS, UV-visible diffuse reflectance spectra (UV-vis DRS), and nitrogen physisorption were carried out to understand the effects of P on the structure of Mo/ZSM5 and its correlation with catalytic performance. The presence of P reduces the acid strength and density, changes the channel system of ZSM5 by forming thermally stable SAPO-like interfaces with the framework AI, and improves the dispersion of molybdenum. Rapid deactivation still occurs on Mo/ZSM5 with 1 wt.% P due to the existence of denser silanol groups, more isolated Mo species, and reduced aperture size with little change in effective micropore volume. A higher P loading (2.5 wt.%) leads to less dense silanol groups and less reduced but stable molybdenum species, and simultaneously reduces channel diameter and internal volume. Consequently, the ethylene selectivity is enhanced and the formation of coke precursors is restricted, resulting in improved stability. (C) 2018 Elsevier Inc. All rights reserved.
WOS关键词	SOLID-STATE NMR ; METHANE DEHYDRO-AROMATIZATION ; HZSM-5 ZEOLITE ; PROPANE DEHYDROGENATION ; ALKANE DEHYDROGENATION ; H-ZSM-5 ZEOLITES ; LIGHT ALKANES ; OXIDATIVE DEHYDROGENATION ; STRUCTURAL DETERMINATION ; CATALYST PERFORMANCE
WOS研究方向	Chemistry ; Engineering
语种	英语
出版者	ACADEMIC PRESS INC ELSEVIER SCIENCE
WOS记录号	WOS:000431164500011
内容类型	期刊论文
源URL	[http://cas-ir.dicp.ac.cn/handle/321008/167226]
专题	大连化学物理研究所_中国科学院大连化学物理研究所
通讯作者	Bao, Xinhe
作者单位	1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Pan, Xiulian,Ji, Zhonghai,Lv, Houfu,et al. Enhanced ethylene selectivity and stability of Mo/ZSM5 upon modification with phosphorus in ethane dehydrogenation[J]. JOURNAL OF CATALYSIS,2018,361:94-104.
APA	Pan, Xiulian,Ji, Zhonghai,Lv, Houfu,&Bao, Xinhe.(2018).Enhanced ethylene selectivity and stability of Mo/ZSM5 upon modification with phosphorus in ethane dehydrogenation.JOURNAL OF CATALYSIS,361,94-104.
MLA	Pan, Xiulian,et al."Enhanced ethylene selectivity and stability of Mo/ZSM5 upon modification with phosphorus in ethane dehydrogenation".JOURNAL OF CATALYSIS 361(2018):94-104.