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Abstract
The surface acidic and redox properties of CeO 2, MoO 3, mechanically mixed CeO 2–MoO 3 and co-precipitated Ce–Mo–O catalysts were characterized by using microcalorimetric adsorption of ammonia and isopropanol (IPA) probe reaction, and the surface properties of these catalysts were correlated with their selectivity for the oxidation of toluene to benzaldehyde and benzoic acid. With the presence of O 2, IPA converted to propylene and diisopropyl ether on acidic sites while converted to acetone on redox sites. It was found that CeO 2 exhibited mainly the redox property while MoO 3 the surface acidity. The IPA probe reaction showed that the mechanically mixed CeO 2–MoO 3 exhibited the surface acidic property, similar to that of MoO 3, indicating that the surface of CeO 2 might be covered by MoO 3 in the mixture upon the calcination at 773 K. On the other hand, the co-precipitated Ce–Mo–O catalyst showed the equivalent acidic and redox properties, and thereby the selectivity to benzaldehyde was greatly enhanced on it as compared to the other catalysts studied in this work.
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