Intracrystalline mass transfer in zeolites monitored by microscopic and macroscopic techniques

Journal Article · Wed Jan 03 00:00:00 EST 1990 · Journal of the American Chemical Society; (USA)

DOI:https://doi.org/10.1021/ja00157a003· OSTI ID:6876223

Foerste, C; Kaerger, J; Pfeifer, H ^[1]

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1. Karl-Marx-Universitaet, Leipzig (Germany Democratic Republic)

Conventional {sup 1}H NMR signal intensity measurements have been used to monitor macroscopically the kinetics of molecular exchange of deuterium-labeled molecules between the intracrystalline space of zeolite crystallites and the surrounding atmosphere. After reaching equilibrium, a pulsed-field-gradient experiment was performed within the same sample tube so that it became possible for the first time to compare results for the intracrystalline migration of adsorbed molecules derived from macroscopic (intensity) and microscopic (pulsed-field-gradient) measurements on identical samples. For benzene adsorbed on zeolite Na-X the intracrystalline diffusivities resulting from these two measuring techniques are found to be in satisfactory agreement. This result proves that molecular exchange between benzene adsorbed in the intracrystalline space of Na-X and the surrounding atmosphere is essentially controlled by intracrystalline mass transfer.

• OSTI ID: 6876223
• Journal Information: Journal of the American Chemical Society; (USA), Vol. 112:1; ISSN 0002-7863
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
36 MATERIALS SCIENCE
ZEOLITES
CHEMICAL REACTION KINETICS
CATALYST SUPPORTS
DATA ANALYSIS
DEUTERIUM COMPOUNDS
EXPERIMENTAL DATA
MASS TRANSFER
MEASURING INSTRUMENTS
MEASURING METHODS
NMR SPECTRA
DATA
HYDROGEN COMPOUNDS
INFORMATION
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
KINETICS
MATERIALS
MINERALS
NUMERICAL DATA
REACTION KINETICS
SPECTRA
400202* - Isotope Effects
Isotope Exchange
& Isotope Separation
360603 - Materials- Properties