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Published on: February 7, 2017
Sm-modified MnOx catalyst enables enhanced low-temperature toluene oxidation: Synergistic dual oxygen reservoir and
Zixuan Zhang1, Haiyang Li2, Huixin Yu3
1College of Environmental and Safety Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China.
Abstract:
Low-temperature catalytic oxidation of VOCs on MnOx catalysts is often hindered by insufficient oxygen supply and sluggish redox activity. A series of Sm-modified MnOx (SmxMny) catalysts were developed to construct interfacial Sm-O-Mn coordination structures, forming stable oxygen storage reservoirs. Among these, Sm2Mn8 exhibited the best catalytic performance for toluene (T50 = 212 °C, T90 = 228 °C), which demonstrated excellent water resistance and long-term stability under humid conditions as well as high space velocity. Comprehensive characterization indicates that the optimal Sm doping concentration induces significant lattice restructuring, forming highly disordered nanosheet structures rich in oxygen vacancies while stabilizing Mn4 + species. Furthermore, the Sm-O-Mn structure substantially reduces the formation energy of oxygen vacancies, maximizes surface oxygen adsorption, and maintains the lattice oxygen reserve. The efficient oxidation pathway of Sm2Mn8 was identified via in situ DRIFTS technology: toluene → benzyl alcohol → benzaldehyde → benzoic acid → maleic anhydride → CO2 + H2O, while simultaneously suppressing the formation of phenolic byproducts. This study reveals the synergistic role of Sm-O-Mn structure in regulating oxygen vacancy formation and lattice oxygen retention, providing a rational strategy for designing high-performance catalysts for low-temperature VOCs oxidation.
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Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
Catalysis
Heterogeneous Catalysis

