Synergistic effect of Pt/Ce and USY zeolite in Pt-based catalysts with high activity for VOCs degradation

Pt/Ce-USY catalysts were synthesized by ethylene glycol reduction (r) and ion exchange (ex) methods, respectively, and the synergistic effect of Pt/Ce and USY zeolite was investigated for VOCs removal at low-temperature. For 1,2-dichloroethane (DCE) degradation, Pt/Ce-USY catalysts doped with CeO2 exhibit more superior activity than Pt/USY catalysts, which owes to the synergistic effect between the abundant acid sites (especially strong acidity) and strong oxidizing sites. While for non-chlorinated VOCs degradation, Pt/USY-r and Pt/Ce-USY-r catalysts both exhibit pretty good low-temperature activity and give the very low T90 values for benzene, ethyl acetate and n-hexane degradation, resulting from the active Pt species dispersed on the surface of USY zeolite. Moreover, loading Pt significantly promotes the deep oxidation of CH3Cl and C2H3Cl intermediates to CO2 and inhibits the deposition of carbon species, thus increases the durability of the catalyst for VOCs degradation, principally, benefiting from the strong Pt-CeO2 interaction.