Rapid bistable reactions in porous catalysts

We analyze the kinetics of rapid bistable reactions (e.g., CO or hydrogen o xidation on Pt) occurring on a nm catalyst particle located inside a mesosc opic pore. Limitations for reactant diffusion inside a single pore are show n to modify the dependence of the reaction rate on the reactant pressures o utside the pore. In particular, the position of the maximum reaction rate i s shifted to higher CO pressures (provided that the O-2 pressure is fixed). This effect is significant if a pore is not too short. Similar effects are possible during oscillations in CO oxidation on supported nm catalyst part icles.