Xiamen Key Laboratory of Materials for Gaseous Pollutant Control, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
Environ Sci Technol. 2024 Sep 3;58(35):15836-15845. doi: 10.1021/acs.est.4c04533. Epub 2024 Aug 22.
The design of a catalyst with multifunctional sites is one of the effective methods for low-temperature catalytic oxidation of chlorinated volatile organic compounds (CVOCs). The loss of redox sites and competitive adsorption of HO prevalent in the treatment of industrial exhaust gases are the main reasons for the weak mineralization ability and poor water vapor resistance of V-based catalysts. In this work, platinum (Pt) is selected to combine with the V/CeO catalyst, which provides more redox sites and HO dissociative activation sites and further enhances its catalytic performance. The results show that PtV/CeO achieves 90% of the CO yield at 318 °C and maintains excellent catalytic activity rather than continuous deactivation within 15 h after water vapor injection. The formation of Pt-O-V bonds enhances the redox ability and promotes deep oxidation of polychlorinated intermediates, accounting for the significantly improved mineralization ability of PtV/CeO. The dissociative activation effect of Pt on HO molecules strengthens the migration and activation of V-adsorbed HO, precluding V-poisoning and notably improving water resistance. This study lays a solid foundation for the efficient degradation of chlorobenzene under humid conditions.
设计多功能位催化剂是低温催化氧化挥发性有机氯化物（CVOCs）的有效方法之一。在处理工业废气时，氧化还原位的损失和 HO 的竞争吸附是 V 基催化剂矿化能力弱和水蒸气阻力差的主要原因。在这项工作中，选择铂（Pt）与 V/CeO 催化剂结合，提供更多的氧化还原位和 HO 离解活化位，从而进一步提高其催化性能。结果表明，PtV/CeO 在 318°C 时达到 90%的 CO 产率，并且在水蒸气注入后 15 小时内保持优异的催化活性，而不是连续失活。Pt-O-V 键的形成增强了氧化还原能力，促进了多氯中间产物的深度氧化，这是 PtV/CeO 矿化能力显著提高的原因。Pt 对 HO 分子的离解活化作用增强了 V 吸附 HO 的迁移和活化，防止了 V 中毒，显著提高了耐水性。这项研究为在潮湿条件下高效降解氯苯奠定了基础。
