Molecular adsorption at a well defined gas-solid interphase: Statistical Rate Theory approach |
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| Institution: | 1. Laboratory of Composite Materials and Functional Coatings, Center for Research and Technological Development in Electrochemistry (CIDETEQ). Parque Tecnológico Sanfandila, Pedro Escobedo, A.P. 064, C.P. 76703, Querétaro, México;2. Centro Mexicano para la Producción más Limpia, Instituto Politécnico Nacional, Av. Acueducto S/n, Col. La Laguna Ticomán, Ciudad de México, 07340, México.;3. Laboratorio de Electroquímica y Análisis de Superficies, Facultad de Ciencias Químicas, Departamento de Ciencia de Materiales, Universidad Juárez del Estado de Durango (UJED) Circuito Universitario, 34120, Durango, México.;4. Technical University of Cluj-Napoca, The Directorate of Research, Development and Innovation Management (DMCDI), Constantin Daicoviciu Street, No. 15, Cluj-Napoca 400020, Cluj county, Romania;5. Institute of Sciences-ICUAP, Benemérita Universidad Autónoma de Puebla, Ciudad Universitaria Puebla, 72530 Puebla, México |
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| Abstract: | The objective of Statistical Rate Theory is to derive explicitly the coverage dependence of the expression for the rate of adsorption. The other parameters in the rate expression can then be viewed as material properties of a gas-solid surface combination, since they have no coverage dependence. After these properties have been tabulated, they can be used with Statistical Rate Theory to predict the rate of adsorption in independent circumstances. This hypothesis is examined by considering CO adsorbing on Ni(1,1,1). The properties of this well defined gas-solid surface are first established from the EELS spectrum, ellipsometric isotherms, and an ultraviolet photoemission spectroscopic study of the desorption rate. These studies were conducted in different laboratories. After these material properties are measured, they are used with Statistical Rate Theory to predict the rate of CO adsorption on Ni(1,1,1) and the result is compared with a set of measurements. Close agreement was found throughout the experimental period. It had been previously reported that Absolute Rate Theory could not describe these results unless both the pre-exponential factor and the activation energy were allowed to depend on coverage. |
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