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- W2018791856 abstract "<TEX>$TiO_2$</TEX>- and <TEX>$SiO_2$</TEX>-supported <TEX>$Co_3O_4$</TEX>, Pt and <TEX>$Co_3O_4$</TEX>-Pt catalysts have been studied for CO and <TEX>$C_3H_8$</TEX> oxidations at temperatures less than <TEX>$250^{circ}C$</TEX> which is a lower limit of light-off temperatures to oxidize them during emission test cycles of gasoline-fueled automotives with TWCs (three-way catalytic converters) consisting mainly of Pt, Pd and Rh. All the catalysts after appropriate activation such as calcination at <TEX>$350^{circ}C$</TEX> and reduction at <TEX>$400^{circ}C$</TEX> exhibited significant dependence on both their preparation techniques and supports upon CO oxidation at chosen temperatures. A Pt/<TEX>$TiO_2$</TEX> catalyst prepared by using an ion-exchange method (IE) has much better activity for such CO oxidation because of smaller Pt nanoparticles, compared to a supported Pt obtained via an incipient wetness (IW). Supported <TEX>$Co_3O_4$</TEX>-only catalysts are very active for CO oxidation even at <TEX>$100^{circ}C$</TEX>, but the use of <TEX>$TiO_2$</TEX> as a support and the IW technique give the best performances. These effects on supports and preparation methods were indicated for <TEX>$Co_3O_4$</TEX>-Pt catalysts. Based on activity profiles of CO oxidation at <TEX>$100^{circ}C$</TEX> over a physical mixture of supported Pt and <TEX>$Co_3O_4$</TEX> after activation under different conditions, and typical light-off temperatures of CO and unburned hydrocarbons in common TWCs as tested for <TEX>$C_3H_8$</TEX> oxidation at <TEX>$250^{circ}C$</TEX> with a Pt-exchanged <TEX>$SiO_2$</TEX> catalyst, this study may offer an useful approach to substitute <TEX>$Co_3O_4$</TEX> for a part of platinum group metals, particularly Pt, thereby lowering the usage of the precious metals." @default.
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- W2018791856 date "2011-02-28" @default.
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- W2018791856 title "CO and C3H8Oxidations over Supported Co3O4, Pt and Co3O4-Pt Catalysts: Effect on Their Preparation Methods and Supports, and Catalyst Deactivation" @default.
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- W2018791856 doi "https://doi.org/10.5322/jes.2011.20.2.251" @default.
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