Isoteric heat of adsorption: theory and experiment

Article Abstract:

The pure gas isoteric heats of adsorption of pure N2 and CO2 on a pelletized silicalite sample were investigated experimentally by multicomponent differential calorimeters and theoretically by a data analysis algorithm based on the Gibbsian Surface Express model. The silicalite sample was found to be energetically homogenous toward N2 adsorption, but energetically heterogeneous toward CO2 adsorption. The heterogeneity for CO2 adsorption was suspected to be due to the presence of polar alumina on the silicalite sample.

Adsorption, Silicon compounds

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Vapor-liquid equilibria of binary and ternary mixtures containing methane, ethane, and carbon dioxide from Gibbs ensemble simulations

Article Abstract:

Simulations of the liquid-phase-vapor-phase equilibria of binary and ternary mixtures in the Gibbs ensemble made possible the creation of molecular models for methane, ethane and carbon dioxide. Equality of chemical potentials between the two phases was maintained through transfer of the smallest molecule and exchange for remaining molecules. Successful acceptance of ratio of exchange was usually more than 10 times larger than that for transfer. These results agree with experimental and other simulation data.

Models, Vapor-liquid equilibrium, Gibbs' free energy, Ethanes, Ethane, Mixtures

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Characterization of porous materials by gas adsorption: do different molecular probes give different pore structures?

Article Abstract:

Issues concerning the adsorption isotherms of methane, argon, carbon dioxide and nitrogen at 77 degrees Kelvin and at room temperature on amorphous activated carbon AX21 are presented.

Gases, Chemistry, Physical and theoretical, Physical chemistry, Gas absorption, Gas adsorption, Amorphous substances, Amorphous materials, Argon

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