  We introduce a simple model of heterogeneous catalysis on a disordered
surface which consists of two types of randomly distributed sites with
different adsorption rates. Disorder can create a reactive steady state in
situations where the same model on a homogeneous surface exhibits trivial
kinetics with no steady state. A rich variety of kinetic behaviors occur for
the adsorbate concentrations and catalytic reaction rate as a function of model
parameters.
