PARASELECTIVITY OF ZEOLITES WITH MFI STRUCTURE - DIFFERENCE BETWEEN DISPROPORTIONATION AND ALKYLATION

被引：38

作者：

KIM, JH ^{[1
]}

NAMBA, S ^{[1
]}

YASHIMA, T ^{[1
]}

机构：

[1] TOKYO INST TECHNOL,DEPT CHEM,MEGURO KU,TOKYO 152,JAPAN

来源：

APPLIED CATALYSIS A-GENERAL | 1992年 / 83卷 / 01期

关键词：

ACID STRENGTH; DISPROPORTIONATION; METALLOSILICATE; PARASELECTIVITY; TOLUENE; TORTUOSITY; XYLENES; ZSM-5; ZEOLITE;

D O I：

10.1016/0926-860X(92)80025-8

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 disproportionation of toluene was carried out on HZSM-5 zeolites modified with boron oxide and coked as well as on several metallosilicate zeolites with MFI structure at 823 K. The para-selectivity of the HZSM-5 zeolite modified with large amounts of boron oxide was higher than that of the parent HZSM-5, while those of the metallosilicate zeolites were as low as that of the HZSM-5. Para-selectivity for the disproportionation of toluene was related to the pore tortuosity. This means that the high para-selectivity for the disproportionation of toluene is caused by "product selectivity". On the other hand, the para-selectivity for the alkylation of ethylbenzene with ethanol is related to the acid strength. We report that the reason of the enhancement in para-selectivity for the disproportionation is distinct from that for alkylation.

引用

页码：51 / 58

页数：8

共 12 条

[1] SELECTIVE ALKYLATION OF TOLUENE WITH METHANOL TO PRODUCE PARA-XYLENE [J].