Surface fractal dimensions of alumina and aluminum borate from nitrogen isotherms

Article Abstract:

A fractal analysis of the nitrogen adsorption isotherms of alumina and aluminum borate samples was conducted to study the effects of calcination temperature on the surface roughness of the samples. The surface fractal dimension values for samples calcined from 500 to 1100 degrees Centigrade were found to be constant despite a large reduction of the BET surface area and pore volume. The alpha-alumina crystalline phase began to sinter and a slightly larger change in the surface fractal dimension was observed only after a 1250 degrees Centigrade calcination.

Surface chemistry, Aluminum compounds, Borates

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Aluminum local environment and defects in the crystalline structure of sol-gel alumina catalyst

Article Abstract:

A study relating to research on the role of low-temperature alumina phases in catalysis was conducted to identify the local environment of aluminum atoms and to gauge the relative abundance of aluminum and oxygen vacancies in the alumina lattice. The experiment was conducted in alumina prepared from the sol-gel method of hydrolysis of aluminum alkoxides. Experimental methodology, results and implications are discussed.

Catalysts, Metallic oxides, Metal oxides, Chemical structure, Crystal lattices

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