Characterisation of acid-treated bentonite.: Reactivity, FTIR study and 27Al MAS NMR

被引：30

作者：

Haffad, D ^{[1
]}

Chambellan, A ^{[1
]}

Lavalley, JC ^{[1
]}

机构：

[1] Univ Caen, ISMRAa, UMR 6506, F-14050 Caen, France

来源：

CATALYSIS LETTERS | 1998年 / 54卷 / 04期

关键词：

bentonite; acidity; FTIR; test reaction;

D O I：

10.1023/A:1019064930150

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：

Acid-treated bentonite shows a catalytic activity towards decomposition of isopropanol due to overall acidity whereas the selectivity accounts for the nature of its acid sites. The examination of the IR spectra using different basic probes such as 2,6-dimethylpyridine, pyridine and CD3CN shows the presence of various types of acid sites. The Lewis acid sites, considered to be the most abundant, are well characterised by pyridine and CD3CN adsorption. In contrast, lutidine adsorption reveals both the existence of Bronsted acid sites and the presence of hydroxyl groups characteristic of beidellite. The potential site created by Al in tetrahedral layers is confirmed by using Al-27 MAS NMR.

引用

页码：227 / 233

页数：7

共 37 条

[1] REACTIONS OF ALK-1-ENES OVER ION-EXCHANGED MONTMORILLONITES [J].