Hydor-dehydrogenation of six-member hydrocarbon cycles on supported platinum-cobalt bimetallic catalysts

摘要

The dehdyrogenation of cyclohexane and hydrogenation of benzene and toluene wee studied on alumina-and NaY-supported Pt,Co and Pt-Co catalysts.The toluene/benzene adsorption equilibrium constant ratios were also determined.hydro-dehydrogenation data were compared with the activities of these catalysts in CO conversion and methane ~1H-~2H exchange data determined and published earlier for the same catalysts.Addition of Co to Pt reduced the hydro-dehydrogenation conversion rates.This effect was substantialy stronger for benzene and toluene hydrogenation than that for dehydrogenation of cyclohexane.The turnover frequency (TOF) value for cyclohexane dehydrogenation indicated a synergy effect between Pt and Co in case of alumina supported Pt:Co sample of 50:50 at%.The TOF values indicated also the existence of significant "cooperation"between Pt and Co in PtCo/Al_2O_3 catalysts.Synergy,found fo rall samplesin formation of oxygenates from CO is elucidated on the basis of Pt-Co interaction,indicated by the increased toluene/benzene adsorption equilibrium constants and conversion rates of thedifferent hydrocarbons.