Reaction Mechanism Revisited: Oxidation of Propylene on a Supported Palladium Catalyst
Hitoshi Mikami1, Hiroto Tsuchiya1, Nobutaka Maeda2
1Honda R&D Co., Ltd., Innovative Research Excellence, 4630 Shimotakanezawa, Haga-machi, Hagagun 321-3393, Tochigi, Japan.
Abstract:
Achieving the complete oxidation of hydrocarbons in automobile exhaust requires a firm understanding of the reaction mechanisms. We investigated catalytic oxidation of C3H6 on Pd/La-Al2O3 as a model reaction using in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) in combination with a transient method, i.e., modulation excitation spectroscopy. A conventional steady-state DRIFTS study demonstrated the formation of surface formate and acetate species, which have been considered to be reaction intermediate species. However, MES-DRIFTS overturned the previously considered mechanism and suggested an involvement of newly discovered acyl species as a potential intermediate species.
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