Acidity of Beta zeolite determined by TPD of ammonia and ethylbenzene disproportionation

被引：91

作者：

Camiloti, AM ^{[1
]}

Jahn, SL

Velasco, ND

Moura, LF

Cardoso, D

机构：

[1] Univ Fed Sao Carlos, Dept Chem Engn, BR-13565905 Sao Carlos, SP, Brazil

[2] Fed Univ Santa Maria, Thermotech Dept, Santa Maria, RS, Brazil

来源：

APPLIED CATALYSIS A-GENERAL | 1999年 / 182卷 / 01期

关键词：

acidity; beta zeolite; ethylbenzene disproportionation; ammonia TPD;

D O I：

10.1016/S0926-860X(98)00418-9

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 acidity of Beta zeolites with Si/Al ratios ranging from 18 to 33 was determined using appropriate temperature programmed desorption of ammonia conditions and their catalytic behavior was evaluated by disproportionation of ethylbenzene. Samples with greater Si/Al ratios presented higher acid strength by retaining ammonia at higher temperatures and showed a higher ethylbenzene disproportionation activity per aluminum atom. These results indicate that as the aluminum content in zeolite Beta is reduced in that range, the strength of the associated acid sites increases. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：107 / 113

页数：7

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