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The transition state theory allows parameters, such as the pre-exponential factor and the activation energy, to be associated with the active centers. These parameters are indicators of the way in which a technical process can be described even if the dominant geometries acting between the species adsorbed and the substrate are not known precisely. The process of modeling methanol synthesis shown here indicates that elementary reactions can be combined with simple coupled differential equations to allow important conclusions to be drawn about the surface reactions of the catalyst.

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