IN-SITU MODELING OF THE ENHANCED BRONSTED ACIDITY IN ZEOLITES

被引：24

作者：

MAKAROVA, MA ^{[1
]}

BATES, SP ^{[1
]}

DWYER, J ^{[1
]}

机构：

[1] UMIST,DEPT CHEM,CTR MICROPOROUS MAT,MANCHESTER M60 1QD,LANCS,ENGLAND

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 1995年 / 117卷 / 45期

关键词：

D O I：

10.1021/ja00150a031

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Enhanced Bronsted acidity is experimentally modeled by a low-temperature adsorption of a Lewis acid (BF3) on the hydrogen form of EMT zeolite. The increase in acid strength is detected in FTIR studies of a low-temperature adsorption of carbon monoxide on the samples pretreated with BF3. The proton affinity of Bronsted hydroxyls decreases linearly with increase in the surface coverage with BF3. A structure for a surface complex, zeolite-Lewis acid, is proposed, and local and cooperative views on the mechanism of enhancing the acid strength of Bronsted hydroxyls are discussed.

引用

页码：11309 / 11313

页数：5

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