Abstract
The role of textural and acid–base properties of supports on metal–support interaction effects has been evaluated through the results obtained in the liquid-phase selective hydrogenation of phenylacetylene carried out on 20 wt% supported nickel catalysts. SiO2, Al2O3, AlPO4, active carbon and a natural sepiolite were used as supports. The effects of Ni–Cu alloying were also studied. The relative adsorption constants, K_T,D, and the relative reactivities, RT,D, obtained in the consecutive hydrogenation process, were used to follow the effects of any electron transfer between the nickel atoms and acid–basic sites on the support surface. Structural defects of supported nickel crystallites were determined by X-ray diffraction line broadening analysis and used for measuring the participation of geometric effects of supported nickel crystallites in the catalytic activity. Results obtained may be better explained within a framework of simultaneous electronic and structural metal–support interaction effects.
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