期刊
CHINESE JOURNAL OF CHEMICAL ENGINEERING
卷 26, 期 1, 页码 116-126出版社
CHEMICAL INDUSTRY PRESS
DOI: 10.1016/j.cjche.2017.03.023
关键词
Zeolite; Catalyst; Kinetics; Xylene isomerization; ZSM-5 zeolite; Desilication
资金
- BIPC, Mahshahr, Iran [08-133/57665]
- BIPC
Desilication accompanied withminimumloss of crystallinity effect of a high alumina ZSM-5 zeolite on the isomerization reaction of ethylbenzene/xylene mixtures has been considered. Desilication was assessed through XRF, XRD, FTIR, TEM, nitrogen adsorption/desorption, NH3-TPD, Si-29 and Al-27 MAS NMR analytical techniques. Desilication was accompanied with the creation of super acid sites. There exists a limit (Si/Al molar ratio of 9.67) for keeping high crystallinity and obtaining improved catalytic performance. Desilication promotes ethylbenzene conversion by disproportionation and trans-alkylation reactions while the same reactions are limited for the xylene isomers. The p-xylene approach to equilibrium improves by more than 7% at 400 degrees C and a WHSV of 2 h(-1) for the optimumsamplewith respect to the parent zeolite. At the same conditions, the optimum sample exhibits the maximum ethylbenzene conversion of 89%, i.e. more than 40% w.r.t. of the parent zeolite. However, the xylene yield decreases only 3%. (C) 2017 The Chemical Industry and Engineering Society of China, and Chemical Industry Press. All rights reserved.
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