Abstract
The interface of a metal oxide is one of the most pivotal defects used for reactions, but its catalytic mechanism is still unclear. In this study, we propose an excessive impregnation method to improve the physicochemical properties and performance during the catalytic wet-air oxidation (CWAO) of landfill leachate (LL) over Ru-doped cost-effective Fe-Co-Ce nanoparticles supported on γ-Al2O3. In mineralization experiments, Fe0.75Co0.75Ce3Ru1.5/γ-Al2O3 (Ru-1.5) exhibited outstanding performance of 89.4% for LL removal, and its kinetic constant was about 2.1 times than the catalyst without Ru. Further investigation revealed the enhanced synergism of Fe, Co, Ru, Ce, and γ-Al2O3 in polymetallic oxides, and the corresponding mechanism can be explained as follows: Three-pronged approaches, activation of oxygen vacancies (OV), reversible electron transition among Fe, Co, and Ru accelerated by rare-metal Ce, and direct mineralization by adsorbing O2, were responsible for the CWAO of LL. Moreover, the addition of Ru not only promoted the catalytic activity, but also reduced the leaching of metals, including Fe, Co, and Ce. The spent catalyst had almost the same efficiency in maintaining high performance, indicating that the physicochemical properties strongly affect the performance of the catalyst.
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