Photothermal catalytic oxidation of toluene with enhanced efficiency over constructed CuMn2O4/Mn2O3 heterojunction catalyst
Photothermal catalyst oxidation of VOCs is a hot issue in the air purifier field due to the reducing of secondary energy consumption. Herein, we reported a photothermal catalyst CuMn 2 O 4 /Mn 2 O 3 with heterojunction for catalytic oxidizing toluene with high efficiency through sol–gel method followed different calcination temperature. Under the irradiation of 700 mW/cm 2 Xe lamp simulated sun light, the CuMn 2 O 4 /Mn 2 O 3 catalyst exhibited excellent full spectrum light absorption capacity, photo-thermal conversion ability and toluene conversion performance with a 90% toluene conversion (T = 233 °C, WHSV = 30,000 mL/g·h), together with a good catalytic stability. The excellent performance can be attributed to the synergistic effect of abundant oxygen vacancies, Mn 3+ active sites and heterojunctions between CuMn 2 O 4 and Mn 2 O 3 due to the XPS, H 2 -TPR, UPS characterizations.
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