A new technique for measuring surface acidity by ammonia adsorption

被引：21

作者：

Brown, DR

Rhodes, CN

机构：

[1] Catalysis Research Unit, Leeds Metropolitan University, Leeds, LS1 3HE, Calverley Street

[2] Department of Chemistry, University of York

来源：

THERMOCHIMICA ACTA | 1997年 / 294卷 / 01期

关键词：

DSC; TG; surface acidity; ammonia; catalyst; clay; ion-exchange resin;

D O I：

10.1016/S0040-6031(96)03139-5

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

A new method for measuring the surface acidity of solid acid catalysts is described. A Stanton Redcroft combined TG-DSC instrument has been modified to allow the introduction of a series of controlled pulses of ammonia into the helium stream passing over the sample. The weight of ammonia adsorbed by the sample and the enthalpy of adsorption are interpreted in terms of the abundance and strength of the surface acid sites. Surface acidity measurements made on three acid-activated clays and an acidic sulphonated ion-exchange resin are compared with catalytic activity data in two model reactions. (C) 1997 Elsevier Science B.V.

引用

页码：33 / 37

页数：5

共 6 条

[1] METHODS FOR CHARACTERIZING ZEOLITE ACIDITY [J].