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Catalysis on a fractal lattice: A model for poisoning.

We investigate the problem of a reaction kinetics scheme on a catalytic surface poisoned by a foreign species. The reaction model we use is a monomer-monomer Langmuir-Hinshelwood scenario. First we present theoretical calculations and Monte Carlo simulations on geometrically disordered lattices such as percolation clusters in Euclidean dimension d=2 and in d=3. Then, we apply our findings to the problem of poisoning of a catalytic surface. We show that the structural changes on the surface strongly affect the reactivity of the catalysis though the poison is taken to remain inert to the reaction.