FORMATION OF COKE IN THE DISPROPORTIONATION OF N-PROPYLBENZENE ON ZEOLITES

被引：25

作者：

LIU, SB ^{[1
]}

PRASAD, S ^{[1
]}

WU, JF ^{[1
]}

MA, LJ ^{[1
]}

YANG, TC ^{[1
]}

CHIOU, JT ^{[1
]}

CHANG, JY ^{[1
]}

TSAI, TC ^{[1
]}

机构：

[1] CHINESE PETR CORP,REFINING & MFG RES CTR,CHIAYI 60036,TAIWAN

来源：

JOURNAL OF CATALYSIS | 1993年 / 142卷 / 02期

关键词：

D O I：

10.1006/jcat.1993.1239

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We investigated the formation of coke on zeolitic catalysts in the disproportionation of n-propylbenzene by means of 129Xe, 27Al, and 13C NMR spectroscopy. According to 13C CP-MAS (proton cross polarization with magic angle spinning) spectra, the coke formed in USY and ZSM-5 zeolites was classified into aliphatics and aromatics. It was found that aliphatic coke could be removed by a simple evacuation procedure. The location of the coke determined from 129Xe NMR spectra and xenon adsorption isotherms varied with the zeolite catalysts. For zeolite USY, the coke was formed inside the supercages and is mainly polyaromatic. For zeolite ZSM-5. the coke is alkykaromatic and tended to deposit at the openings of the channels rather than at their intersections. In regard to the mechanism, the reaction on USY followed bimolecular kinetics, whereas on ZSM-5 the reaction was monomolecular. © 1993 Academic Press, Inc.

引用

页码：664 / 671

页数：8

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