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Influence of molecular shape on probing mass transfer resistances on zeolites
Author(s) -
Kärger Jörg,
Pfeifer Harry,
Stallmach Frank,
Bülow Martin,
Struve Peter,
Entner Roland,
Spindler Herbert,
Seidel Rüdiger
Publication year - 1990
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690361005
Subject(s) - hydrothermal circulation , mass transfer , desorption , chemistry , butane , zeolite , methane , decane , chemical engineering , analytical chemistry (journal) , chemical physics , adsorption , chromatography , organic chemistry , catalysis , engineering
Mass transfer resistances in zeolite NaCaA after different hydrothermal pretreatment are probed by NMR tracer desorption studies with the short‐chain‐length hydrocarbons from methane to n ‐butane and with xenon. In all cases, the measurements lead to the coinciding result of forming surface barriers, which differ only slightly depending on the pretreatment modes, but lead to a retardation of molecular mass transfer more dramatically than the starting material. The dramatic retardation of mass transfer after hydrothermal pretreatment is confirmed by supplementary uptake measurements with n ‐decane.