Abstract
An investigation of the nature of the oxidation sites on silica-alumina and their role in various reactions has been carried out. Positive ion radical formation with adsorbed anthracene and perylene was examined along with the effects of silica-alumina on propylene polymerization, alkylation of aromatic hydrocarbons, and the decomposition of a carbonyl compound, pivalaldehyde. The effects of sodium ion exchange and ammonia adsorption on the activity of silica-alumina for these reactions were also examined. The results indicate that Bronsted acid sites are responsible for propylene polymerization and alkylation of aromatic hydrocarbons, while oxidation sites are responsible for aromatic ion radical formation. A spectrum of both Bronsted and oxidation sites is proposed to account for the activity of silica-alumina.
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