The Reduction of Platinum Consumption in Environmental Catalysts for Complete Oxidation of Volatile Organic Compounds
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.
Nobuhito Imanaka, "The Reduction of Platinum Consumption in Environmental Catalysts for Complete Oxidation of Volatile Organic Compounds" in "Composites at Lake Louise 2017", Eric Duoss, Lawrence Livermore National Laboratory, USA Waltraud M. Kriven, University of Illinois at Urbana-Champaign, USA Eds, ECI Symposium Series, (2017). http://dc.engconfintl.org/composites_all_2017/22