Constructing\nBridge Hydroxyl Groups on the Ru/MO<sub><i>x</i></sub>/HZSM‑5\n(M = W, Mo) Catalysts to Promote\nthe Hydrolysis Oxidation of Multicomponent VOCs

Chlorinated\nand oxygenated volatile organic compounds (CVOCs and\nOVOCs) pose a significant threat to human health. Catalytic oxidation\neffectively removes these pollutants, but catalyst deactivation is\na challenge. Our study focused on the hydrolysis oxidation of chlorobenzene\n(CB) and ethyl acetate (EA) over Ru/MO<sub><i>x</i></sub>/HZSM-5 (M = W, Mo). It was found that doping MoO<sub><i>x</i></sub> to the catalyst increased the structural hydroxyl amount and\nbalanced surface acidity, thus significantly improving the catalytic\nstability, with Ru/MoO<sub><i>x</i></sub>/HZSM-5 exhibiting\na better activity for CB and EA oxidation (<i>T</i><sub>90%</sub> = 438 and 276 °C at space velocity = 20,000 mL g<sup>–1</sup> h<sup>–1</sup>, respectively). Water vapor\nintroduction considerably promoted hydrolysis oxidation and protected\nthe active sites from being poisoned by cumulative chlorine. The synergistic\ninteraction of the Mo–O(H)–Al structure in Ru/MoO<sub><i>x</i></sub>/HZSM-5 with the Si–OH–Al structure\npromotes the activation of H<sub>2</sub>O to form bridging hydroxyl\ngroups, which provide a proton-rich environment for hydrolysis oxidation.\nIt was also found that dissociated H<sub>2</sub>O reacted with adsorbed\noxygen species to form highly active *OOH, accelerating the deep oxidation\nof intermediates. We believe that the present study can provide a\nunique strategy for the effective elimination of multicomponent VOCs\nunder complex conditions.