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In ‐ situ CIR‐FTIR study of the diffusion of supercritical hydrocarbons in zeolite L
Author(s) -
Süer Murat G.,
Dardas Zissis,
Lu Yaping,
Moser William R.,
Ma Yi H.
Publication year - 1997
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.690430709
Subject(s) - supercritical fluid , zeolite , heptane , diffusion , thermal diffusivity , chemistry , fourier transform infrared spectroscopy , microporous material , analytical chemistry (journal) , hydrocarbon , chemical engineering , thermodynamics , organic chemistry , catalysis , physics , engineering
Cylindrical internal reflectance infrared spectroscopy (CIR‐FTIR) was used for the determination of the transport properties of hydrocarbons in zeolite L at high temperatures and pressures. This was the first time that the intracrystalline diffusivity of hydrocarbons in microporous media could be determined under supercritical conditions by using a dynamic technique. The study investigated the self‐diffusion of n‐heptane, the counterdiffusion of n‐hexane and 1‐hexene, and the codiffusion of n‐heptane and pyxlene in zeolite L under subcritical and supercritical conditions. The diffusion time constants obtained for the single and binary systems showed that the diffusion within the pore was reduced significantly under supercritical conditions (i.e., liquidlike behavior) as the hydrocarbon density within the pore was increased.