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

Despina Tzoulaki, Lars Heinke, Maria Castro, Pablo Cubillas, Michael W. Anderson, Wuzong Zhou, Paul A. Wright, Joerg Kaerger

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)11665-11670
Number of pages6
JournalJournal of the American Chemical Society
Volume132
Issue number33
DOIs
Publication statusPublished - 25 Aug 2010

Keywords

  • METHANOL
  • CATALYSTS
  • ZEOLITES
  • OLEFINS

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