n-pentane isomerization in different phase regions near the critical temperature

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	n-pentane isomerization in different phase regions near the critical temperature
	Hou, ZS; Han, BX; Zhang, JM; Liu, ZM; He, J; Zhang, XG; Yang, GY
刊名	JOURNAL OF SUPERCRITICAL FLUIDS
	2003
卷号	25 期号:1 页码:81-90
关键词	N-pentane Isomerization Coking Supercritical Fluid Sulfated Zirconia
ISSN号	0896-8446
英文摘要	The isomerization reaction of n-pentane over porous solid acid catalyst was investigated at 198.0 degreesC, which is slightly higher than the critical temperature of n-pentane. The pressure of the reactant in the reactor was controlled so that the reaction fluid was in gas, near critical, and supercritical (SC) states. The results showed that the conversion of n-pentane increased sharply with increasing pressure near the critical point. The amount of coke deposition depends strongly on the pressure of the reaction fluid. The main reason for the deactivation of the catalyst was coke deposition on the catalyst. Deactivation of catalyst was repressed at the higher pressure because more coke precursors produced in the reaction was dissolved into the fluid, which increases the stability of the catalyst. UV-vis, IR, thermogravimetric analysis and H-1 NMR studies indicated that there were at least two kinds of coke precursors on catalyst surface. The effect of pressure on the properties of the coke was not considerable, although it influences the quantity of the coke deposition on the catalyst significantly. The loss of sulfur can be neglected at reaction temperature and the state of sulfur remains unchanged after reaction. It is advantageous to conduct the isomerization reaction at SC condition. (C) 2002 Elsevier Science B.V. All rights reserved.
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000180592900008
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/80495]
专题	中国科学院化学研究所
通讯作者	Han, BX
作者单位	Chinese Acad Sci, Inst Chem, Ctr Mol Sci, Beijing 100080, Peoples R China
推荐引用方式 GB/T 7714	Hou, ZS,Han, BX,Zhang, JM,et al. n-pentane isomerization in different phase regions near the critical temperature[J]. JOURNAL OF SUPERCRITICAL FLUIDS,2003,25(1):81-90.
APA	Hou, ZS.,Han, BX.,Zhang, JM.,Liu, ZM.,He, J.,...&Yang, GY.(2003).n-pentane isomerization in different phase regions near the critical temperature.JOURNAL OF SUPERCRITICAL FLUIDS,25(1),81-90.
MLA	Hou, ZS,et al."n-pentane isomerization in different phase regions near the critical temperature".JOURNAL OF SUPERCRITICAL FLUIDS 25.1(2003):81-90.