Room-temperature degradation of o-xylene in simulated air using an online-regenerable plasma-catalysis reactor with low amounts of nanosized noble metals on Co₃O₄

Abstract

The plasma catalytic degradation of o-xylene in simulated air was improved by loading low amounts of Pt, Pd, or Au on Co3O4. At room temperature, o-xylene conversion of and COx selectivity using 0.1wt%Pt/Co3O4 catalyst reached 98.9% and 80%, and the energy efficiency was at the top level in comparison with literature values. A stable o-xylene degradation performance could be obtained by online regenerating the heat-insulated reactor with a high energy density. After characterization, it was found that the loading of nano-sized Pt not only increased the Co3+/Co2+ ratio, where Co3+ is benefit for the formation of reactive oxygen species, but also conduce Pt0 to oxygen activation, resulting in effective promotion of o-xylene complete oxidation. Operando plasma diffuse reflectance infrared Fourier transform spectroscopy demonstrated the o-xylene complete oxidation and proved that Pt played a key role in the complete oxidation of o-xylene.