Formation of surface barriers on silicalite-1 crystal fragments by residual water vapour as probed with isobutane by interference microscopy

Autor:	Despina Tzoulaki, Wolfgang Schmidt, Ursula Wilczok, Jörg Kärger
Rok vydání:	2008
Předmět:	Chemistry Diffusion Analytical chemistry Mineralogy Sorption General Chemistry Condensed Matter Physics Molecular sieve Interference microscopy Crystal chemistry.chemical_compound Mechanics of Materials Isobutane General Materials Science Zeolite Water vapor
Zdroj:	Microporous and Mesoporous Materials. 110:72-76
ISSN:	1387-1811
DOI:	10.1016/j.micromeso.2007.08.041
Popis:	In the framework of this study and for the very first time interference microscopy has been applied to examine molecular uptake and release on only one segment rather than on the whole unity of an MFI crystal. We performed subsequent cycles of uptake/release of isobutane in/from the fragments and recorded the evolution of the intracrystalline concentration profiles. The measurements exhibit perfect reproducibility and show that the overall process is dominated by intracrystalline diffusion. Most remarkably, under the presence of even traces of spurious water molecules inside the sorption vessel, with increasing cycle numbers uptake and release are progressively controlled by resistances on the crystal surface, indicating the formation of surface barriers.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::d28071c2271825bfcadc0d794dece4ab https://doi.org/10.1016/j.micromeso.2007.08.041 Zobrazit plný text záznamu Full Text from ScienceDirect