Abstract
Developing efficient catalysts for catalytic oxidation of toluene at low temperatures is challenging. Herein, the OH groups and oxygen vacancies are introduced into CeO2 by methanol modification and applied in catalytic oxidation of toluene. CeO2-T-M, one of the modified CeO2, displays the greatest catalytic activity for toluene oxidation with T90 of 235 oC. In situ characterizations and theoretical calculations show that abundant OH groups and oxygen vacancies on the CeO2-T-M are well correlated with the catalytic activity. The OH groups facilitate the adsorption and activation of gaseous oxygen into adsorbed active oxygen species (O22-) and lattice oxygen (O2-) over oxygen vacancies. And the toluene and key intermediates (benzyl alcohol, benzaldehyde, benzoate, and maleic anhydride) are more easily adsorbed and oxidized on CeO2-T-M. Meanwhile, the consumed OH groups will be regenerated with activated lattice oxygen by dehydrogenation, thus the catalytic activity and stability for toluene oxidation are enhanced over modified CeO2.
Published Version
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