Pt and Mo Co-Decorated MnO 2 Nanorods with Superior Resistance to H 2 O, Sintering, and HCl for Catalytic Oxidation of Chlorobenzene

MnO 2 nanorods with exposed (110), (100), or (310) facets were prepared and investigated for catalytic oxidation of chlorobenzene, then the (110)-exposed MnO 2 nanorod was screened as the candidate parent and further modified by Pt and/or Mo with different contents. The loading of Pt enhanced activity and versatility of the pristine MnO 2, but the polychlorinated byproducts and Cl 2 were promoted, conversely, as the decoration of Mo inhibited the polychlorinated byproducts and improved durability. Determination of structure and properties suggested that Pt facilitated the formation of more oxygen vacancies/Mn 3+ and surface adsorbed oxygen weakened the bonds of surface lattice oxygen, while Mo stabilized surface lattice oxygen and increased acid sites, especially Brønsted acid sites. Expectedly, Pt and Mo bifunctionally modified MnO 2 presented a preferable activity, selectivity, and durability along with the super resistance to H 2 O, high-temperature, and HCl, and no prominent deactivation was observed within 30 h at 300 °C under dry and humid conditions, even at high-temperature aging at 600 °C and HCl-pretreatment (7 h). In this work, the optimized Mo and Pt codecorated MnO 2 was considered a promising catalyst toward practical applications for catalytic oxidation of actual Cl-VOCs emissions.