Screening Study of Silica-Supported Catalysts for Photoepoxidation of Propene by Molecular Oxygen
作者： Hisao Yoshida , Chizu Murata , Tadashi Hattori
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摘要: Abstract To find systems that are effective for the photocatalytic epoxidation of propene by molecular oxygen, 50 types silica-supported metal oxides were screened photooxidation activity. Many elements on silica found to be active photooxidation, and samples classified according High selectivity oxide (PO), but with a conversion as low silica, was observed loaded alkali metals (Li, Na), alkaline-earth (Mg, Ca, Sr, Ba), rare-earth (Y La). It seems moderate electron negativity improve silica. Some (such Ti, Zn, Pb, Bi) gave high yields PO. The most systems, PO CO x selectivity, Ti Zn under experimental conditions. Furthermore, photoepoxidation proceeds catalytically sample. dispersion surface is an important factor production in these systems.
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