Improved CO, hydrocarbon and NO oxidation performance using zone-coated Pt-based catalysts

Catalysis Today, Available online 15 May 2012, In Press, Corrected Proof

Improved CO, hydrocarbon and NO oxidation performance using zone-coated Pt-based catalysts

Ali Abedi, Jin-Yong Luo, William S. Epling

Department of Chemical Engineering, University of Waterloo, 200 University Ave W, Waterloo, ON N2L 3G1, Canada

Abstract

Investigators describe the effect of an axial Pt distribution along a diesel oxidation catalyst (DOC) by comparing a standard catalyst, with a homogeneously distributed Pt amount along the length, with a non-homogeneously distributed catalyst (zoned).

The zoned catalyst had more Pt located at the upstream portion, and less downstream, while maintaining the same total amount of Pt as the standard case. The effects of flow rate on NO, CO or C₃H₆ oxidation, and during oxidation of NO and C₃H₆ as a mixture, were used for the comparison. The reaction details along the catalyst were also resolved using spatially resolved, capillary inlet mass spectrometry (Spaci-MS). Results showed that the performance of the two catalysts were similar at low flow rate and with a single reacting gas, while the zoned sample worked better for CO and C₃H₆ oxidation as the flow rate increased, and better for NO oxidation in the NO/C₃H₆ gas mixture.

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