Abstract
Actual industrial emissions usually contain multiple aromatic VOCs, but little is known about adsorption and oxidation behaviors of multicomponent aromatic VOCs over catalysts, which limits the practical application of catalytic oxidation technology. Herein, the adsorption and oxidation of toluene and o-xylene mixture generated during paint production over Pt-based supported catalysts (Pt/NiO, Pt/Co3O4, Pt/Nb2O5 and Pt/CeO2) were investigated. Pt/Nb2O5 and Pt/CeO2 catalysts significantly promoted the oxidation of mixture. However, Pt/NiO and Pt/Co3O4 catalysts exhibited more difficulties in degrading mixed VOCs. Characterization results revealed that Pt/NiO and Pt/Co3O4 possessed higher percentage of surface adsorbed oxygen. Pt/Nb2O5 and Pt/CeO2 had more surface lattice oxygen, Pt0 species and acid sites. The weak competitive adsorption over Pt/Nb2O5 and Pt/CeO2 catalysts might be related to their acidic and electronic properties. In situ experiments proved that surface adsorbed oxygen and surface lattice oxygen of Pt/CeO2 could oxidize toluene and o-xylene simultaneously at lower temperature. However, the depleted oxygen species on Pt/Co3O4 could not be replenished in time due to the strong competitive adsorption and different oxidation mechanisms. This study uncovers the mixing effect of toluene and o-xylene over Pt/MOx catalysts, which provides a guiding direction towards the development of catalysts for efficient degradation of multicomponent VOCs.
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