Abstract
The abatement of brominated volatile organic compounds (Br-VOCs) is an urgent task due to their serious harmfulness to human health and the environment. In this work, ordered mesoporous spinel Co3O4 was synthesized for the catalytic oxidation of dibromomethane (CH2Br2) as a model pollutant for Br-VOCs. The combined results of XRD, BET, and TEM suggested that ordered mesoporous spinel Co3O4 was successfully synthesized. Ordered mesoporous spinel Co3O4 showed a higher catalytic activity than bulk spinel Co3O4. Particularly, Co3O4-K showed the highest catalytic activity, and its T90 value was only 271 °C. Meanwhile, Co3O4-K showed the highest selectivity to CO2 at low temperature, and a good stability for at least 30 h. The superior catalytic activity was related to their ordered mesoporous channel structures with large specific surface area, high content of active Co3+, and strong redox property. According to the results of product analysis and in situ DRIFT spectra, a reasonable mechanism for CH2Br2 oxidation over ordered mesoporous spinel Co3O4 was proposed.
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