期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 132, 期 33, 页码 11665-11670出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja104016n
关键词
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资金
- European Commission [MRTN-CT-2004-005503]
- German Science Foundation
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.
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