Abstract
Two types of hydroxyapatite (HAP)–silica composites were prepared from aqueous solutions of Ca(NO 3) 2 and (NH 4) 2HPO 4 in the presence of SiO 2 in a buffer (pH 7.5) and an alkaline condition. Photooxidation of propylene with oxygen was carried out over the composites at 303 K. The major product was propylene oxide which exceeded 80% among C3 oxygenated products. The conversion increased with an increase in HAP content, but the selectivity of propylene oxide decreased. This was caused by that propylene oxide was strongly adsorbed on HAP followed by consecutive photooxidation. The thin-layered HAP in the HAP–SiO 2 composite is more effective for photoepoxidation of propylene than the bulk HAP.
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