Bulletin of the Chemical Society of Japan · 1972 · 11 citations · 15 references
Natural SciencesChemical EngineeringChemistryChemical KineticsPhysical ChemistrySurface ScienceCatalytic MaterialsCatalytic MechanismsCatalytic Reaction KineticsSurface CatalysisSurface Reaction KineticsSurface ReactionsApparent Activation EnergyCarbon DioxideCatalyst MechanismsCatalyst Structure-activity RelationshipsCatalytic Surface KineticsZeolite AdsorptionZeolite CatalystsZeolites
Abstract In order to estimate the reactivity of each hydroxyl group, the exchange reaction of deuterium with the hydroxyl groups on the surfaces of the HX, HY, and CaHX zeolites and aerosil was investigated kinetically by an infrared method. The hydroxyl groups appearing at 3660 cm−1 on the HX and HY zeolites were more readily exchanged with deuterium than were the other hydroxyl groups on the two zeolites. However, in the case of the CaHX, the order of activities of each hydroxyl group changed with the pressure of deuterium. The rate equation for the reaction is expressed by a Langmuir-type equation. This fact indicates the homogeneity of each hydroxyl group on zeolite. It was found that adsorbed water and carbon dioxide catalyzed the exchange reaction. Furthermore, a compensation effect between the apparent activation energies and the frequency factors occurs in this reaction.
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