Oxy-Anionic Doping: A New Strategy for Improving Selectivity of Ru/CeO2 with Synergetic Versatility and Thermal Stability for Catalytic Oxidation of Chlorinated Volatile Organic Compounds

作者：Kai Shen, Biao Gao, Hangqi Xia, Wei Deng, Jiaorong Yan, Xiaohan Guo, Yanglong Guo, Xingyi Wang, Wangcheng Zhan, Qiguang Dai · 发表于：Environmental Science & Technology · 年份：2022 · DOI：10.1021/acs.est.2c00942 · 被引用次数：71 · 研究领域：Catalytic Processes in Materials Science、Catalysis and Oxidation Reactions、Nanomaterials for catalytic reactions

Understanding the formation and inhibition of more toxic polychlorinated byproducts from the catalytic oxidation elimination of chlorinated volatile organic compounds (Cl-VOCs) and unveiling efficient strategies have been essential and challenging. Here, RuO x supported on CePO 4 -doped CeO 2 nanosheets (Ru/Pi-CeO 2 ) is designed for boosting catalytic oxidation for the removal of dichloromethane (DCM) as a representative Cl-VOC. The promoted acid strength/number and sintering resistance due to the doping of electron-rich and thermally stable CePO 4 are observed along with the undescended redox ability and the exposed multi-active sites, which demonstrates a high activity and durability of DCM oxidation (4000 mg/m 3 and 15,000 mL/g·h, stable complete-oxidation at 300 °C), exceptional versatility for different Cl-VOCs, alkanes, aromatics, N-containing VOCs, CO and their multicomponent VOCs, and enhanced thermal stability. The suppression of polychlorinated byproducts is determined over Ru/Pi-CeO 2 and oxy-anionic S, V, Mo, Nb, or W doping CeO 2, thus the oxy-anionic doping strategy is proposed based on the quenching of the electron-rich oxy-anions on chlorine radicals. Moreover, the simple mechanical mixing with these oxy-anionic salts is also workable even for other catalysts such as Co, Sn, Mn, and noble metal-based catalysts. This work offers further insights into the inhibition of polychlorinated byproducts and contributes to the convenient manufacture of monolithic cataly...