Non-thermal plasma synthesis of supported Cu-Mn-Ce mixed oxide catalyst towards highly improved catalytic performance for volatile organic compound oxidation
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A 0.4 wt%Pt/Ce0.76Zr0.19Zn0.05O1.95 catalyst was prepared by the evaporative drying method. The catalytic toluene oxidation activity of the catalyst was investigated and the calcination temperature dependence on the toluene oxidation activity was characterized. It was confirmed that only CO2 and steam were produced by the complete oxidation of toluene, and no toluene-derived compounds were detected as by-products with a gas chromatography-mass spectrometer. Toluene was completely oxidized at 320 °C on the 0.4 wt%Pt/Ce0.76Zr0.19Zn0.05O1.95 catalyst calcined at 500 °C. The toluene oxidation activity slightly decreased with increasing the calcination temperature of the catalyst. However, significant deactivation was not recognized in the present 0.4 wt%Pt/Ce0.76Zr0.19Zn0.05O1.95 catalyst, and toluene was completely oxidized at 360 °C even after calcination at 1000 °C. From these results, it became obvious that the 0.4 wt%Pt/Ce0.76Zr0.19Zn0.05O1.95 catalyst has high thermal stability for toluene oxidation activity.
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The catalytic activity of catalysts for the oxidation of toluene and toluene+xylene mixture was investigated in the microreactor of fixed-bed type. The calcination temperatures and loadings of catalysts played the important role in the activity of catalysts for the oxidation of toluene. The increasing calcination temperatures and loadings of catalysts increased the crystallite size of the platinum to result in the higher oxidation activity of catalysts. The catalytic activity for the toluene oxidation over catalysts turned out to be increasing in the order of $500^{\circ}C\; catalysts calcined at for 3 hrs in the air showed the highest activity for the oxidation of the toluene. The decrease of oxidation activity of catalysts calcined at might result from the decrease of active sites by sintering of platinum metals as well as supports. The 1.0wt% catalyst showed the activity from the lower temperature at , reached the light-off temperature () at , and leveled off its activity at with the conversion of 100% 'Mutual promotion' effects were observed for the binary mixture of toluene and xylene. The activity of the easy-to-oxidize toluene was slightly increased with the existence of the xylene. It might suggest the different mechanism for the oxidation of toluene and xylene on the catalysts on different sites, and its reaction of gaseous oxygen.
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