Application of the Dubinin-Radushkevich and Dubinin-Astakhov equations in the characterization of microporous solids

被引：121
作者：
Gil, A
Grange, P
机构：
[1] U. de Catalyse et Chim. des M., Univ. Catholique de Louvain, 1348 Louvain-la-Neuve, Place Croix du Sud
来源：
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 1996年 / 113卷 / 1-2期
关键词：
adsorption isotherms; adsorption potential distributions; Dubinin-Astakhov equation; Dubinin-Radushkevich equation; microporosity; pillared clays;
D O I：
10.1016/0927-7757(96)81455-5
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 application of the Dubinin-Radushkevich (DR) and Dubinin-Astakhov (DA) equations to the characterization and comparison of microporous solids has been studied. Nitrogen adsorption isotherms at low relative pressures have been measured for a variety of microporous solids: four pillared clays (Al-PILC, SiAl-PILC, Ti-PILC and Zr-PILC), two zeolites (Y-82 and H-ZSM5), and two activated carbons. Both equations have been used to obtain the adsorption potential distributions for all samples. The pillared clays show bimodal adsorption potential distributions in both formalisms. These bimodal distributions are related to bimodal micropore size distributions, and the presence of two types of surfaces of adsorption in the micropores is also considered. The zeolites and activated carbons show single-peaked distributions in both formalisms, but modifications of the adsorption potential distributions are observed.
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收藏
页码：39 / 50
页数：12
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