Transient diffusion, sorption, and desorption of cyclopropane in NaX zeolite

Journal Article · Sun Sep 01 04:00:00 EDT 1991 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1016/0021-9517(91)90326-Y· OSTI ID:5636749

Efsthathiou, A M; Suib, S L; Bennett, C O ^[1]

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1. Univ. of Connecticut, Storrs (United States)

Transient diffusion, sorption, and desorption experiments of cyclopropane in NaX zeolite at 1 bar in a flow microreactor reveal that the nature of the diluent gas used in the sorbate mixture affects the kinetics of intracrystalline mass transport of cyclopropane in the zeolite. The rate of intracrystalline mass transport and the equilibrium uptake are strongly dependent on temperature. The outward mass transport of cyclopropane into 1 bar Ar gas is found to be an activated process with an apparent activation energy of 7.4 kcal/mol. Rates of diffusion are affected by the gas phase pressure. The enthalpy of sorption for cyclopropane at loadings approaching zero is found to be {minus}9.0 kcal/mol, and the entropy of sorption is {minus}18.2 cal/mol-K.

• OSTI ID: 5636749
• Journal Information: Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 131:1; ISSN 0021-9517; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400 -- Petroleum-- Processing
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ACTIVATION ENERGY
ADSORPTION ISOTHERMS
ALKANES
CATALYSTS
CONTROL
CYCLOALKANES
DESORPTION
ENERGY
ENTHALPY
ENTROPY
EQUILIBRIUM
HYDROCARBONS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
ISOTHERMS
KINETICS
MASS TRANSFER
MATERIALS
MINERALS
ORGANIC COMPOUNDS
PHYSICAL PROPERTIES
SILICATE MINERALS
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
TEMPERATURE CONTROL
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
ZEOLITES