Abstract
Oxidation of o-xylene on the Sn−Sb oxide system calcined at 500 °C yields tolualdehyde as main partial oxidation product, its quantity increasing with the increasing Sb content, and some phthalic anhydride at lower Sb concentration (≤40 at. % Sb). Increase in catalyst calcination temperature leads to a decrease in selectivity to partial oxidation products, accompanied by an increase in total oxidation products. Comparison of the results with those reported for the same catalysts in propylene oxidation /2–4/ shows different responses of both hydrocarbons to surface structure changes occurring on calcination, thus indicating different “surface structure sensitivity” for both oxidation reactions in the case of the Sn−Sb−O system.
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