Abstract
A combined system of Raman spectroscopy and ellipsometry is developed for the observation of catalyst surfaces under reaction conditions. The deposition of carbon species on Co catalysts during the Boudouard reaction and the hydrogenation of these carbon species are observed quickly and in situ by a rotating analyzer ellipsometer in connection with the observation of Raman scattering of the surface carbon species and the mass analysis of the product. Prior to the hydrogenation reaction the state of surface hydrogen on Co was studied by the ellipsometer at temperatures above the desorption temperature T d determined by TDS. It is concluded that hydrogen atoms on Co are mainly located at subsurface sites at T > T d, and the surface carbons are attacked by them from the metal side to produce hydrocarbons.
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