Catalytic combustion technology is
one of the effective methods
to remove VOCs such as toluene from industrial emissions. The decomposition
of an aromatic ring via catalyst oxygen vacancies is usually the rate-determining
step of toluene oxidation into CO2. Series of CeO2 probe models were synthesized with different ratios of surface-to-bulk
oxygen vacancies. Besides the devotion of the surface vacancies, a
part of the bulk vacancies promotes the redox property of CeO2 in toluene catalytic combustion: surface vacancies tend to
adsorb and activate gaseous O2 to form adsorbed oxygen
species, whereas bulk vacancies improve the mobility and activity
of lattice oxygen species via their transmission effect. Adsorbed
oxygen mainly participates in the chemical adsorption and partial
oxidation of toluene (mostly to phenolate). With the elevated temperatures,
lattice oxygen of the catalysts facilitates the decomposition of aromatic
rings and further improves the oxidation of toluene to CO2.
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