High Performance Diesel Oxidation Catalysts Using Ultra-Low Pt Loading on Titania Nanowire Array Integrated Cordierite Honeycombs



High performance of an ultra-low Pt loading diesel oxidation catalyst can be achieved by using a combination of novel nano-array structured support, precise control of ultrafine active Pt particles, and an addition of H₂ as a promoter into the exhausts. Highly stable mesoporous rutile TiO₂ nano-array was uniformly grown on threedimensional (3-D) cordierite honeycomb monoliths using a solvothermal synthesis. Atomic layer deposition was employed for precise dispersion of ultrafine Pt particles (0.95 ± 0.24 nm) on TiO₂ nano-array with a Pt loading of 1.1 g/ft³. Despite low Pt loading, the Pt/TiO₂ nano-array catalyst shows impressive low-temperature oxidation reactivity, with the conversion of CO and total hydrocarbon (THC) reaching 50% at 224 and 285°C, respectively, in the clean diesel combustion (CDC) simulated exhaust conditions. The excellent activity is attributed to the unique nano-array structure that promotes gas-solid interaction and ultra-small Pt particle dispersion that increase surface Pt atoms. We also demonstrate that addition of more H₂ into the exhaust can lower light-off temperature for CO and THC by up to ~60 °C and ~30 degrees °C, respectively.


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Titanium dioxide, Nanowires, Catalyst supports, Monolithic catalysts, Oxidation


US Department of Energy (Award # DE-EE0006854) and the US National Science Foundation (Award # CBET-1344792)


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