THE study of the combustion of carbon under conditions closely simulating cases of industrial importance involves simultaneous solutions to interlocked problems in heat and material transfer, fluid dynamics, and reaction kinetics.
MnO2 nanorods with exposed (110), (100), or (310) facets
were prepared and investigated for catalytic oxidation of chlorobenzene,
then the (110)-exposed MnO2 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 MnO2, but the polychlorinated byproducts and Cl2 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/Mn3+ 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 MnO2 presented a preferable activity, selectivity, and durability
along with the super resistance to H2O, 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 MnO2 was considered a promising
catalyst toward practical applications for catalytic oxidation of
actual Cl-VOCs emissions.
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