Journal of the Chemical Society - Faraday Transactions p. 685 - 691 (1996)
Update date:2022-08-10
Topics:
Wada, Kenji
Yoshida, Kiyomi
Watanabe, Yoshihisa
Mitsudo, Take-Aki
The photo-oxidation of ethene and propene using zinc oxide and titanium oxide-based catalysts has been investigated at various reaction temperatures. The activity of the zinc oxide catalyst (0.25 g) was greatly enhanced when the reaction temperature was raised to 450-500 K, to afford 21 μmol h-1 of ethanal, 16 μmol h-1 of propenal and 49 μmol h-1 of carbon oxides, together with small amounts of propanal and methanal at 493 K. Loading of Group 5 or 6 metal oxide species on zinc oxide suppressed the formation of carbon oxides and propenal, whereas a significant formation of propanal was observed in addition to ethanal. Molybdenum oxide-loaded catalysts showed high selectivities toward oxygen-containing chemicals. Since the MoO3/SiO2 catalyst showed a similar product distribution in the photo-oxidation of propene, surface active centres including molybdenum species on zinc oxide surface seem to be responsible for the reaction. The use of titanium oxide-based catalysts at ambient temperature generally resulted in low selectivities toward oxygen-containing chemicals.
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