Mechanism of silation of silica with hexamethyldisilazane

Article Abstract:

Research aiming to determine the nature of silyl species on the surface of silica silated with hexamethyldisilazane is presented. It has been established that the extent of reaction and product distribution are determined by the temperature of reaction.

Silica

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Mechanism of silation of alumina with hexamethyldisilazane

Article Abstract:

The silation of alumina with hexamethyldisilazane has been analyzed at temperature 150-450 degrees Celsius. A mechanism is proposed after the products and sequence of the reactions at the alumina surface have been examined. Results show that the reaction produces ammonia as well as methane, hexamethyldisiloxane and nitrogen. Initially, the reaction in each case generates pendant -O-SiMe3 and - NH-SiMe3 moieties. The subsequent reaction at temperatures above 300 degrees Celsius of these pendant groups with residual surface hydroxyls is the elimination of methane.

Analysis, Aluminum oxide

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Mechanism of H2S oxidation by ferric oxide and hydroxide surfaces

Article Abstract:

Spectroscopic and volumetric experiments on the interaction of H2S with the surfaces of alpha-Fe2O3 and amorphous ferric hydroxide were conducted. The surface sites involved in the interaction, the resulting intermediates and the reaction of H2S with other metallic oxides were also examined. The replacement of the O2- anions with S2- and SH- was the initial reaction of the H2S with the surface of alpha-Fe2O3 or amorphous ferric hydroxides. This reaction did not affect the surface hydroxyls. S2- was oxidized to elemental sulfur after the interaction of SH- with the hydroxyls.

Bulk solids, Hydrogen sulfide, Metallic oxides, Metal oxides, Surface chemistry, Hydroxides

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