The Reduction of Platinum Consumption in Environmental Catalysts for Complete Oxidation of Volatile Organic Compounds

Conference Dates

November 12-16, 2017


Pt/Co3O4/CeO2-ZrO2-SnO2/-Al2O3 catalysts were successfully prepared by both conventional co-precipitation and impregnation methods. The catalytic performances for toluene oxidation on these materials indicate that the addition of Co3O4 to the Pt/CeO2-ZrO2-SnO2/-Al2O3 catalyst was significantly effective in reducing the platinum amount without further reduction in its activity. In fact, complete oxidation of toluene was realized by using the 1wt%Pt/11wt%Co3O4/16wt%Ce0.62Zr0.20Sn0.18O2.0/-Al2O3 catalyst at the temperature as low as 160 °C, which was lower than that with the 5wt%Pt/-Al2O3 catalyst (170 °C). Since the oxidation activities of both 1wt%Pt/16wt%Ce0.62Zr0.20Sn0.18O2.0/-Al2O3 and 1wt%Pt/11wt% Co3O4/-Al2O3 were below compared to that of the present 1wt%Pt/11wt%Co3O4/16wt%Ce0.62Zr0.20Sn0.18O2.0/-Al2O3, the main reason for the high toluene oxidation activity in the 1wt%Pt/11wt%Co3O4/16wt%Ce0.62Zr0.20Sn0.18O2.0/-Al2O3 catalyst can be ascribed to the concerted effect of Pt, Co3O4, and Ce0.62Zr0.20Sn0.18O2.0 on -Al2O3.

In addition, novel type of refractory and noble Pt metal-free 17wt%La1−xCaxCoO3−x/2/Ce0.76Zr0.19Zn0.05O1.95 (0 ≤ x ≤ 0.15) catalysts was also tested for complete toluene oxidation. The composition was optimized to obtain the optimum toluene oxidation activity. Catalytic tests for toluene oxidation and characterization of oxygen release/storage properties of these materials suggest that the Ca2+ addition in the LaCoO3 lattice was appreciably effective in the enhancement of the toluene oxidation even after high-temperature treatment as high as around 1400 °C. In fact, complete oxidation of toluene was realized at 320 °C by using the 17wt%La0.9Ca0.1CoO2.95/Ce0.76Zr0.19Zn0.05O1.95 catalyst treated at 1400 °C. La0.9Ca0.1CoO2.95 oxide on the Ce0.76Zr0.19Zn0.05O1.95 support promoted toluene oxidation without using any precious platinum metal, and, therefore, the present catalyst has an advanced potential as the novel toluene oxidation catalyst.

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