SHAPE-SELECTIVE DISPROPORTIONATION OF XYLENE OVER PARTIALLY CATION-EXCHANGED H-MORDENITE

被引:20
作者
NAMBA, S
IWASE, O
TAKAHASHI, N
YASHIMA, T
HARA, N
机构
[1] TOKYO INST TECHNOL,DEPT CHEM,MEGURO KU,TOKYO 152,JAPAN
[2] TOKYO UNIV AGR & TECHNOL,DEPT IND CHEM,KOGANEI,TOKYO 184,JAPAN
关键词
D O I
10.1016/0021-9517(79)90135-0
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
The shape-selective disproportionation of xylene to form 1,2,4-trimethylbenzene over the partially exchanged H-mordenite catalysts by various cations has been studied. The catalysts were prepared by a conventional or rapid cation-exchange method. The shape selectivity depends on the ionic radius of exchanged cation. The most suitable ionic radius is nearly 0.096 nm. The most suitable catalyst is the H-mordenite exchanged by Cu cation. This catalyst has a high selectivity, not only because there is not enough space to form the transition state leading to 1,3,5-trimethylbenzene, but also because the diffusion of 1,3,5-trimethylbenzene is inhibited. The rapid cation exchange is more effective than the conventional one, because a smaller amount of cation controls the pore dimension and provides a high selectivity without a drop in activity. © 1979.
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页码:445 / 452
页数:8
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