Open AccessConcentration dependence of intracrystalline self-diffusion in zeolites
Author(s) -
Harry Pfeifer,
Jörg Kärger,
A. Germanus,
Wolfgang Schirmer,
Martin Bülow,
Jürgen Caro
Publication year - 1985
Publication title -
adsorption science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.682
H-Index - 36
eISSN - 2048-4038
pISSN - 0263-6174
DOI - 10.1177/026361748500200403
Subject(s) - chemistry , adsorption , zeolite , diffusion , pulsed field gradient , self diffusion , relaxation (psychology) , sorption , molecular diffusion , chemical physics , molecular sieve , analytical chemistry (journal) , molecule , thermodynamics , chromatography , organic chemistry , catalysis , physics , self service , marketing , business , psychology , social psychology , metric (unit) , operations management , economics
The nmr pulsed field gradient technique is applied to study molecular self-diffusion in zeolitic adsorbate—adsorbent systems. Depending on the zeolite type and on the nature of the adsorbate—adsorbent interaction, the concentration dependence of the self-diffusion coefficients reveals considerable differences. Furthermore, intracrystalline molecular transport may be significantly influenced by the co-adsorption of a second molecular species. Supported by additional nuclear magnetic relaxation and sorption rate measurements microdynamic models for the observed diffusion behaviour are established.