Acidity and catalytic activity of mildly acid-treated Mg-rich montmorillonite and hectorite

被引:58
作者
Komadel, P [1 ]
Janek, M [1 ]
Madejova, J [1 ]
Weekes, A [1 ]
Breen, C [1 ]
机构
[1] SHEFFIELD HALLAM UNIV, MAT RES INST, SHEFFIELD S1 1WB, S YORKSHIRE, ENGLAND
来源
JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS | 1997年 / 93卷 / 23期
关键词
D O I
10.1039/a705227h
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
XRD, FTIR spectroscopy, cyclohexylamine desorption, potentiometric titrations and catalytic activity in an ether-forming test reaction have been used to investigate mildly acid-treated montmorillonite (SAz-1) and hectorite. The number of acid sites obtained from the cyclohexylamine desorption agreed with the accepted cation exchange capacity values for all samples. No evidence of any free protons was found in the potentiometric titration curves, which proved that complete autotransformation of the acid-treated samples had occurred over a much shorter period than previously recorded. Acid sites associated with Al3+ (Fe3+) released from the SAz-1 structure during acid treatment and subsequent autotransformation were of sufficient strength to cataryse the test reaction and produce tetrahydropyrstnyl ether in 80% yield. The complete absence of catalytic activity in the acid-treated hectorite samples confirmed that acid sites associated with interlayer Mg2+ and Li+ were unable to catalyse the test reaction.
引用
收藏
页码:4207 / 4210
页数:4
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