Transient sorption and desorption studies of cyclopropane and propylene with Cs/NaX and Ni/NaX zeolites

Journal Article · Fri May 01 04:00:00 EDT 1992 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1016/0021-9517(92)90282-M· OSTI ID:7180614

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

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

Transient diffusion and sorption experiments of cyclopropane and propylene in Cs[sup +] and Ni[sup 2+] ion-exchanged Zeolites X in a flow microreactor reveal that the nature of the diluent gas affects the kinetics of intracrystalline mass transport of these molecules in the zeolite. The rate of intracrystalline mass transport and the equilibrium uptake are strongly dependent on temperature. The results indicate that cyclopropane does not react with either Cs[sup +] or Ni[sup 2+] ion-exchanged Zeolites X in the range 40-240 C to give other gas-phase products. For Cs/NaX the enthalpy of sorption for cyclopropane at loadings approaching zero is [minus]8.8 kcal/mol, and the entropy of sorption is [minus]31.2 cal/mol-K. For Ni/NaX the enthalpy of sorption for both cyclopropane and propylene is [minus]9.1 kcal/mol, and the corresponding vales for the entropy of sorption are [minus]30.8 and [minus]29.8 cal/mol-K.

• OSTI ID: 7180614
• Journal Information: Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 135:1; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020500 -- Petroleum-- Products & By-Products
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKALI METALS
ALKANES
ALKENES
CESIUM
CYCLOALKANES
DIFFUSION
ELEMENTS
ENTHALPY
ENTROPY
EQUILIBRIUM
HYDROCARBONS
INORGANIC ION EXCHANGERS
ION EXCHANGE
ION EXCHANGE MATERIALS
MASS TRANSFER
MATERIALS
METALS
MINERALS
NICKEL
ORGANIC COMPOUNDS
PERMEABILITY
PHYSICAL PROPERTIES
PROPYLENE
SILICATE MINERALS
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSIENTS
TRANSITION ELEMENTS
ZEOLITES