Most of the approaches to surface kinetics assume an infinite twohyphen;dimensional plane. Although this condition can be met experimentally, in most of the practical cases the surface is usually in the form of small particles or spheres to maximize the total surface area. Here, we extend our previous twohyphen;dimensional results to dimerization where the reactants are constrained to move on a spherical particle. Using a statistical nonequilibrium thermodynamic approach, we find that under certain conditions the curvature of the sphere is an important parameter which significantly affects the rate coefficient.
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