Characterization of Hydrophobic Nature of High Siliceous Zeolite-Silicalite by Adsorption and Diffusion
Rept. for Oct 1986-Sep 1987
CHEMICAL RESEARCH DEVELOPMENT AND ENGINEERING CENTER ABERDEEN PROVING GROUND MD
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Silicalite samples with SiAl ratios of 126, 563, and 1062 were characterized in terms of adsorption and diffusion with water, methanol, benzene and n-hexane at 25 C. The characterization was carried out by the gravimetric method with a Cahn electro-balance in a constant-volume and constant-temperature system. It was found that 1 the saturation equilibrium adsorption capacity for water in silicalite decrease as the SiAl ratio increases 2 the effect of Si Al ratio on the saturation equilibrium adsorption capacity of organics in silicalite is small and 3 the diffusion of guest molecules in silicalite depends primarily on the size of the guest molecules. Additionally, a comparison of hydrophobic properties of silicalite and activated carbon was made. The result indicates that the water adsorption capacity of silicalite is about twelve times less than that of activated carbon. Hydrophobicity of silicalite increases substantially after fluorination F-silicalite. Keywords Hydrophobicity Aluminum Silicalite Zeolite Silica Adsorption Diffusion Methanol Benzene Hexane.
- Inorganic Chemistry