Effect of cations on methane adsorption by NaY, MgY, CaY, SrY, and BaY zeolites
- Cleveland State Univ., OH (United States)
Methane isotherms on NaY, MgY, CaY, SrY, and BaY zeolites are measured between 25 and 70[degree]C and upto 6760 kPa. All isotherms are of type I. The initial heat of adsorption for divalent cationic forms decreased with decreasing charge density (CaY > MgY > SrY > BaY) except for MgY. Similar anamoly was observed for methane adsorption on MgX (Zhang, S. Y.; Talu, O.; Hayhurst, D. T. J. Phys. Chem. 1991, 95, 1722) and it is attributed to incomplete dehydration (activation) at normal activation temperatures. The cation type significantly affected adsorption properties even at loadings as high as 7.5 molecules/cavity. CaY has the largest capacity per weight, but the methane pore density decreased in order of decreasing cationic size (BaY > SrY > CaY > MgY > NaY) at 25[degrees]C and 5200 kPa fugacity. This unexpected result is attributed to possible differences in molecular packing around the cations at high loadings. The data were satisfactorily correlated by the virial isotherm model. 29 refs., 6 figs., 3 tabs.
- OSTI ID:
- 7115609
- Journal Information:
- Journal of Physical Chemistry; (United States), Vol. 97:49; ISSN 0022-3654
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
METHANE
ADSORPTION
NATURAL GAS
STORAGE
ADSORPTION HEAT
CATIONS
COMPILED DATA
ISOTHERMS
ZEOLITES
ALKANES
CHARGED PARTICLES
DATA
ENERGY SOURCES
ENTHALPY
FLUIDS
FOSSIL FUELS
FUEL GAS
FUELS
GAS FUELS
GASES
HYDROCARBONS
INFORMATION
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
IONS
MATERIALS
MINERALS
NUMERICAL DATA
ORGANIC COMPOUNDS
PHYSICAL PROPERTIES
SILICATE MINERALS
SORPTION
THERMODYNAMIC PROPERTIES
032000* - Natural Gas- Transport
Handling
& Storage
400201 - Chemical & Physicochemical Properties