Spatially-Resolved Reactant Species Concentrations in a Model Diesel Oxidation Catalyst

William  Epling, University of Waterloo

Authors: Bill Epling, Karishma Irani and Dick Blint

Oxidation reactions over a model monolith-supported Pt-Pd/Al2O3 diesel oxidation catalyst were characterized as a function of temperature and position within the catalyst using spatially resolved capillary-inlet mass spectrometry (SpaciMS). The data obtained demonstrate that H2 and CO are oxidized prior to C3H6 and C12H26 and clearly show back-to-front ignition of the reductant species. NO oxidation was observed to light-off at the same time as the dodecane, and high NO conversions were observed, likely related to dodecane partial oxidation products.

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