Synthesis and characterization of ruthenium and nickel nanoparticles on graphene composites, and their application in catalytic hydrogenation and catalytic transfer hydrogenation reactions
Date Issued
2015
Date
2015
Author(s)
Lee, Jer-Yeu
Abstract
The main theme of thesis is on the synthesis and characterization of the graphene composite abbreviated as GO-IL-Ru, based on graphite oxide with additional functional groups of organic ionic trains. It contains Ru at 1.61 wt% level (by ICP-OES), and the oxidation state of Ru NPs is Ru0 (by XANES and EXAFS). GO-IL-Ru has been used as a catalyst in both the hydrogenation reactions and transfer hydrogenation reactions. The catalytic activity of GO-IL-Ru was very good at compounds with phenyl groups, but not at those containing electronegative substituents or heterocyclic rings. Moreover, under insufficient hydrogen supplies, polystyrene polymer was formed, paralled to the styrene hydrogenation. When the TEMPO radical was added in the reaction mixture, both hydrogenation products and polymerization products were decreased in yields. Microwave speed-up of the catalytic transfer hydrogenation reactions was experimentably found as expected. Ni(NO3)2 could be thermally decomposed in the presence of rGO to form magnetic NiO NPs on rGO sheets. The rGO-NiO composite contains Ni at 46.9 wt% level (by ICP-OES), the oxidation state of Ni is NiII (by XPS and PXRD). The rGO-NiO composite also has the ability to catalyze the transfer hydrogenation reactions, especially benzadehyde and related compounds.
Subjects
graphene
metal nanoparticle
hydrogenation
Type
thesis
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