Characterization of the structure and catalytic activity of Pt/sepiolite catalysts

Four catalysts containing 1% w/w Pt deposited on various sepiolite supports were prepared. Two natural sepiolites and another two obtained by acid tre atment of one of them were used. Both the sepiolites used as metal supports and the catalysts were characterized for structure and surface properties, using H-1 and Si-29 MAS NMR spectroscopy, and Si-29 CP/MAS NMR spectroscop y, in addition to hydrogen, pyridine, and CO2 chemisorption measurements. T he activity of the catalysts in the hydrogenation of benzene to cyclohexane and the dehydrogenation of cyclohexane to benzene was examined and the cat alyst supported on the natural sepiolite called Pangel was found to be the most active of all. (C) 2000 Academic Press.