Catalytic combustion of hydrogen
 

I'm trying to simulate the catalytic combustion of a hydrogen/air mixture (5 % hydrogen and 95 % air) on platinum in 2d geometry.
The reaction mechanism includes only surface reactions and is imported in Chemkin format.
Also, computational domain consists of a gas region and a solid region (plate with platinum catalyst on interface).
Inlet and boundary temperature is 420 K.
The problem is that the reaction does not occur on the surface.

How to properly setup model?