Oxidation reactions over a model monolithsupported Pt-Pd/Al 2 O 3 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 H 2 and CO are oxidized prior to C 3 H 6 and C 12 H 26 and clearly show back-to-front ignition of the reductant species. Significant NO oxidation was observed simultaneous to dodecane light-off, likely related to dodecane partial oxidation products.
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