HETEROGENEOUS CATALYSIS IN SUSTAINABLE GREEN SOLVENT: ALKENES HYDROGENATION WITH NEW SILICA IMMOBILIZED PALLADIUM COMPLEX CONTAINING S,O-CHELATING LIGAND

Authors : Filiz YILMAZ

Pages : 546-554

Doi:10.18038/aubtda.409518

View : 11 | Download : 9

Publication Date : 2018-03-31

Article Type : Research Paper

Abstract :Pd(II) complex containing S,O-chelating ligand was immobilized on surface of the amine functionalized silica support in scCO 2 media. Silica-based catalyst ( SiO 2 -ThiophPd(II)) were characterized by IR, SEM, XRF, and BET analyses. The catalytic activity of the immobilized catalyst in hydrogenation reactions of alkenes has been compared with the homogeneous counterpart. SiO 2 -ThiophPd(II) catalyst showed good activity and reusability than homogeneous system. The best conversion in styrene hydrogenation was obtained with TOF value as 5871 h -1 at 370 K, 10 bar H 2 and 1500 psi total pressure. Especially, while homogeneous counterpart has not activity in cyclohexene hydrogenation, it has been provided 100% cyclohexane conversion with the immobilized catalyst. It has also been found that the catalyst can be reused at least ten times without significant loss of activity in the styrene hydrogenation
Keywords : Immobilized Pd II complex, Alkene Hydrogenation, Reusability