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Direct propene oxidation with molecular O2 was performed at 428K under atmospheric pressure over titanium sulfate-modified zirconia (STi/Z) and sulfated-zirconia (SZ) catalysts, which were prepared by direct impregnation of TiIV sulfate and ammonium sulfate solution onto amorphous zirconia, respectively. The 7.5%STi/Z catalyst exhibited the highest propene conversion (5.6%) under the experimental conditions. C3-Oxygenates such as propene oxide (PO) and acetone were detected as products with C4-C6 hydrocarbons. The catalytic performances depended on the amounts of surface sites for NH3 adsorption, which could be associated with sulfate content, calcination temperature and reaction time. Molecular oxygen forms oxygenates, and reduces carbonaceous deposits.

Aeroblc Oxidation of Propene over Amorphous Zirconia Impregnated with Titanium Sulfate.