Assessing Molecular Transport Properties of Nanoporous Materials by Interference Microscopy: Remarkable Effects of Composition and Microstructure on Diffusion in the Silicoaluminophosphate Zeotype STA-7

被引：33

作者：

Tzoulaki, Despina ^{[1
]}

Heinke, Lars ^{[3
]}

Castro, Maria ^{[5
]}

Cubillas, Pablo ^{[6
]}

Anderson, Michael W. ^{[6
]}

Zhou, Wuzong ^{[4
]}

Wright, Paul A. ^{[4
]}

Kaerger, Joerg ^{[2
]}

机构：

[1] Tech Univ Munich, D-85747 Garching, Germany

[2] Univ Leipzig, Dept Expt Phys 1, D-04103 Leipzig, Germany

[3] Max Planck Gesell, Fritz Haber Inst, D-14195 Berlin, Germany

[4] Univ St Andrews, Sch Chem, St Andrews KY16 9ST, Fife, Scotland

[5] IFP Lyon, F-69390 Vernaison, France

[6] Univ Manchester, Sch Chem, Ctr Nanoporous Mat, Manchester M13 9PL, Lancs, England

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2010年 / 132卷 / 33期

关键词：

METHANOL;

D O I：

10.1021/ja104016n

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The influence of the chemical composition and of the storage and activation protocol on the diffusion of methanol into strongly chemically zoned crystals of the silicoaluminophosphate zeotype STA-7 has been investigated by interference microscopy. Analysis of the evolution of transient intracrystalline concentration profiles reveals that just-calcined SAPO STA-7 crystals with lower Si content (Si/(Si + P) = 0.18) exhibit higher surface permeability and bulk diffusivity than those with higher Si content (S/(Si + P) = 0.37). Remarkably, crystals with the higher Si content which were stored in the calcined form crack during activation along planes of weakness already present in the as-prepared crystals, creating fresh surfaces through regions of lower Si that are much more easily penetrated by the adsorbing methanol than are the original surfaces.

引用

页码：11665 / 11670

页数：6

共 24 条

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