As a promising abatement technology for CVOCs removal, catalytic oxidation has been sent to the spotlight with a great importance to develop suitable catalysts with high activity, high selectivity and long-time stability. In this work, it was found that doping niobium and tungsten into TiO₂ could improve activity of the catalysts for catalytic oxidation of dichloromethane and the latter stood out. The W₁Ti₁₀O_x catalyst exhibited highest activity below 225 °C and was overtaken then by RuO₂/W₁Ti₁₀O_x as temperature rose (100% dichloromethane conversion and 100% CO₂ selectivity at 300 °C), which could be attributed to the synergistic effects of acidity and redox ability according to NH₃-TPD, Py-IR and H₂-TPR results. In addition, abundant surface active oxygen species and high oxygen mobility also made contribution to the decomposition of dichloromethane. However, distinct deactivation over W₁Ti₁₀O_x was observed during the activity and stability tests. Further research went to show that the loss of active components tungsten species, as culprit of the inactivation, was caused by the reaction between tungsten and chlorine. And loading RuO₂ could avoid the formation of WCl_x or WO_xCl_y and the loss of tungsten via Deacon reaction, thereby improving the resistance of Cl-poisoning and stability of the catalysts.

作为一种很有前景的 CVOCs 减排技术，催化氧化已成为人们关注的焦点，对于开发具有高活性、高选择性和长期稳定性的合适催化剂具有重要意义。在这项工作中，发现在TiO ₂中掺杂铌和钨可以提高二氯甲烷催化氧化催化剂的活性，并且后者表现突出。W ₁ Ti ₁₀ O _x催化剂在 225 °C 以下表现出最高活性，然后随着温度升高被 RuO ₂ /W ₁ Ti ₁₀ O _{x取代（100% 二氯甲烷转化率和 100% CO 2根据 NH 3} -TPD、Py-IR 和 H ₂ -TPR 结果，这可归因于酸度和氧化还原能力的协同效应。此外，丰富的表面活性氧物种和高氧迁移率也有助于二氯甲烷的分解。然而，在活性和稳定性测试期间观察到明显的 W ₁ Ti ₁₀ O _x失活。进一步的研究表明，作为失活罪魁祸首的活性成分钨物种的损失是由钨和氯之间的反应引起的。负载RuO ₂可以避免形成WCl _x或WO _x Cl_y和通过 Deacon 反应损失钨，从而提高催化剂的抗氯中毒和稳定性。