SYNTHESIS AND REACTIVITY OF THIN OXIDE-FILMS ON THE MG(001) SURFACE
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The adsorption and reaction of a series of Bronsted acids were examined on the oxidized Mg(001) surface. Continuous oxide films of one to two monolayers in thickness were formed by exposure of the clean Mg(001) surface to O2 at room temperature; these oxide layers were characterized by AES and LEED. Temperature-programmed desorption experiments indicated that Bronsted acids interacted with these oxide films in three characteristic patterns. Acetic acid and acetylene were irreversibly adsorbed, and large amounts of surface carbon were observed after TPD experiments. Alcohols and water were reversibly dissociated into hydrogen and alkoxy species (hydroxyl in the case of water). Upon heating, the dissociated components formed only the parent molecule via recombination above 300 K. Neither dehydration nor dehydrogenation products were observed following alcohol adsorption. Formaldehyde, propylene, and propyne were weakly adsorbed, desorbing from the surface below 260 K. The above results are in excellent agreement with previous studies of adsorption on bulk magnesium oxide powders and suggest that the chemical properties of the highest coordination ion pair sites for MgO may be reproduced on such oxide films. 1985, American Chemical Society. All rights reserved.
