Detailed reaction kinetics for double-layered Pd/Rh bimetallic TWC monolith catalyst

• Reaction kinetics of Pd/Rh TWC was developed by combining kinetics of each catalyst.
• Combined kinetics well predicted TWC performances, independent of washcoat location.
• This may be understood by the thin catalyst layers less than 50 μm.

Detailed intrinsic reaction kinetics for the double-layered Pd/Rh-based TWC has been developed by combining the reaction kinetics derived for the individual Pd- and Rh-based catalysts without any further adjustment of the kinetic parameters obtained from the reaction kinetics of each catalyst. A 2D non-isothermal monolith reactor model based upon the combined reaction kinetics developed well describes the general trend of the TWC performance of and the temperature distribution in the double-layered Pd/Rh and Rh/Pd monolith reactors under steady-state conditions, irrespective of the location of Pd and Rh layers in the double-layered TWC monolith, mainly due to the thin catalyst layers washcoated onto the channels of the monolith. The detailed reaction kinetics has been further validated by its capability of predicting the TWC performance of the commercial Rh/Pd double-layered monolith reactor.

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