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In this study, reaction characteristics of C 2 H 4 /O 2  and C 3 H 6 /O 2  on practical Pt/Al 2 O 3  monolith catalyst are investigated, and a simplified microkinetic surface reaction mechanism is proposed by taking the observed surface species and their occupied active surface sites into account. Importance of more than one active PGM surface site occupations at the adsorption step of C 2 H 4  or C 3 H 6  and multiple-sited stable intermediate CHxspecies are considered. Gas phase experimental results show that the light-off temperature as well as complete conversion temperature of both C 2 H 4 /O 2  and C 3 H 6 /O 2  mixture shift to lower side with the increase in oxygen concentration. The surface species analyses show the presence of stable intermediate CHxspecies and linearly adsorbed CO on the platinum surface. Numerically simulated light-off performance with the proposed reaction mechanism shows good agreement with the experimental results of C 2 H 4 /O 2  and C 3 H 6 /O 2 . Moreover, simulation results also agree well with the additional experimental results with multiple gas compositions and validate the proposed detailed reaction mechanism.

combustion science and technology

Development of Detailed Surface Reaction Mechanism of C 2 H 4 /C 3 H 6  Oxidation on Pt/Al 2 O 3  Monolith Catalyst Based on Gas Phase and Surface Species Analyses