Spatial Resolution of Reactant Species Consumption in Diesel Oxidation Catalysts

摘要

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. Significant NO oxidation was observed simultaneous to dodecane light-off, likely related to dodecane partial oxidation products.