Journal of Catalysis
Journal of Catalysis
5 years ago

Insights into the active sites of ordered mesoporous cobalt oxide catalysts for the total oxidation of o-xylene

Insights into the active sites of ordered mesoporous cobalt oxide catalysts for the total oxidation of o-xylene
Cobalt oxide is a typical transition metal oxide that exhibits high catalytic activity for the total oxidation of volatile organic compounds. In this study, a reduction process in a glycerol solution was adopted to generate mesoporous CoO (meso-CoO) or CoO x (meso-CoO x ) from mesoporous Co3O4 (meso-Co3O4). The obtained samples were rich in Co2+ species and exhibited high catalytic activity for o-xylene oxidation. The meso-CoO x sample with the largest surface Co2+ amount performed the best: The o-xylene conversion at 240°C was 83%, and the reaction rate over meso-CoO x was nine times higher than that over meso-Co3O4. It is found that the samples with more surface Co2+ species possessed better oxygen activation ability, and the Co2+ species were the active sites that favored the formation of highly active O2 − and O2 2− (especially O2 −) species.

Publisher URL: www.sciencedirect.com/science

DOI: S0021951717301926

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