Catalytic oxidation of chlorobenzene over ruthenium-loaded VMoTi catalyst

Designing efficient catalysts is important for controlling the pollution of chlorinated volatile organic compounds (CVOCs). In this work, chlorobenzene (CB) was selected as the target pollutant. A novel (RuO₂)_x-V₂O₅-MoO₃/TiO₂(denoted as Ru_x-VMoTi, x = 1, 2, 3) catalyst was successfully synthesized by loading different contents of Ru onto V₂O₅-MoO₃/TiO₂ (denoted as VMoTi) via the impregnation method. Activity tests showed that Ru loading significantly enhanced the catalytic performance. Among these, Ru₂-VMoTi exhibited the best performance, with its T₉₀ dropping to 250 °C, CO₂ yield reaching 75% at 325 °C, and demonstrating good stability. A series of characterizations was performed on the catalyst. The results showed that the lattice defects induced by Ru loading promote increased formation of oxygen vacancies (O_v). Ru loading also increased the number of acidic sites and the low-temperature redox activity of the catalyst, thus enhancing the performance of CB catalytic oxidation. The catalytic oxidation pathway of CB and the promoting mechanism of Ru were further analyzed by in situ DRIFTS and GC–MS. This study provides new insights for designing efficient and stable catalysts for CVOCs through the metal synergistic strategy.

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