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Rational Design of Oxidation Catalysts for Diesel Emission Control
Technical Paper
2008-01-0070
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Euro IV-V and US 2007-2010 emission control regulations, combined with changing engine-out emission characteristics of advanced diesel combustion systems result in different performance and durability requirements for diesel oxidation catalysts depending upon specific platforms and regulation levels. A rational catalyst design approach has been utilized to develop a series of catalysts with performance, durability, and PGM utilization characteristics to meet different system requirements. Promoted-Pt catalysts with 40 °C lower CO light-off temperatures and improved thermal durability compared to Pt-only formulations have been developed for use in applications with low exhaust temperatures. The promoted-Pt catalysts also provide tunable NO oxidation activity, which is important for NO/NO2 control (SCR) and areas where excessive NO2 emissions are of concern. Results are presented for a Pt/Pd formulation that provides major improvements in thermal durability compared to Pt-only formulations for use in high temperature environments (e.g., active regeneration systems). Data are also presented for Pt/Pd/Au formulations with equal or better performance and durability compared to Pt/Pd formulations. The Pt/Pd/Au systems provide alternative PGM utilization strategies that can act as a buffer from PGM price fluctuations, allowing more stable system cost.
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Fujdala, K., Truex, T., Nicholas, J., and Woo, J., "Rational Design of Oxidation Catalysts for Diesel Emission Control," SAE Technical Paper 2008-01-0070, 2008, https://doi.org/10.4271/2008-01-0070.Also In
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