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Benzene hydrogenation over Pt/siliceous zeolites
A comprehensive study has been made on benzene hydrogenation over several zeolite and alumina supported platinum catalysts. It was found that the hydrogenation activity of the supported Pt depends strongly on the support structure, reaction temperature, and Pt content and deposition procedures. For Pt/ZSM-5 (Si/Al = 150), a higher activity was observed for supported Pt prepared by impregnation than ion-exchange method. Consequently, a reverse trend was observed for the methylcyclopentane-to-cyclohexane product ratio, which serves as an indicator for bifunctional catalysis. Selective modifications of Pt/ZSM-5 catalysts using various phosphines as Pt-poisoning agents have been made to identify the locations of the supported Pt. The results correlate well with rate constants and activation energies derived from the zeroth order kinetics model. Furthermore, a highly active Pt/silicalite catalyst has been developed, its potential applications in catalyzing benzene saturation reaction of light reformate in gasoline is also discussed.
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Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate