Abstract
The current catalysts for polychlorinated aromatics (PCAs) oxidation showed either poor low-temperature catalytic activity, low mineralization ability or bad stability, and developing oxygen vacancies enriched catalysts with abundant acid sites is a potential solution for the above drawbacks. Herein, oxygen vacancies enriched Nb-WOX were developed for o-DCB (o-dichlorobenzene, a PCAs model compound) oxidation, and they showed notably better low-temperature catalytic activity with T50% <350 °C than did commercial WO3 (T50% >400 °C) under the WHSV of 36000 mL g−1h−1. Nb-WOX supported Ru exhibited even lower T50% (173 °C) and T90% (238 °C), as well as high COX yield with >99% ratio of CO2 to CO and good stability (>99% conversion for 500 mins) when with 1.5 wt% Ru loading at 300 °C. The above phenomenon was attributed to the abundant oxygen vacancies and acid sites in Nb-WOX that contributed to the better redox property, stronger interaction with Ru species and the removal of accumulated chloride. The o-DCB oxidation mechanism revealed that the higher CO2 ratio to CO on Ru/Nb-WOX arose from the deep oxidation of CO byproducts. The work described here will instruct us to degrade PCAs effectively through catalysts design.
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