Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/48504
Title: CONVERSION OF LEVULINIC ACID TO GAMMA-VALEROLACTONE USING P-CYMENE RU(II) N-HETEROCYCLIC CARBENE COMPLEXES
Authors: TAY BOON YING
Keywords: homogeneous catalysis, heterogeneous catalysis, carbene, ruthenium nanoparticles, levulinic acid, gamma-valerolactone
Issue Date: 16-Sep-2013
Source: TAY BOON YING (2013-09-16). CONVERSION OF LEVULINIC ACID TO GAMMA-VALEROLACTONE USING P-CYMENE RU(II) N-HETEROCYCLIC CARBENE COMPLEXES. ScholarBank@NUS Repository.
Abstract: This thesis deals with the catalytic hydrogenation of levulinic acid (LA) to gamma-valerolactone (GVL) using two hydrogen sources, molecular hydrogen (Route 1) and formic acid (FA, Route 2). Six p-cymene Ru(II) N-heterocyclic carbene (NHC) complexes bearing monodentate and bidentate NHC ligand moieties were prepared and characterised. In Route 1, we found that the catalysis proceeded in a heterogeneous fashion where the ruthenium complexes act as a precursor to catalytically active ruthenium nanoparticles (RuNPs) rather than a soluble metal catalyst. pH has an effect on the stability on the RuNPs. In Route 2, the catalysis was found to proceed in a homogeneous fashion where the presence of FA might aid in the formation of a formate-bridged ruthenium dimer that will first catalyse the decomposition of FA to hydrogen and carbon dioxide followed by the formation of GVL.
URI: http://scholarbank.nus.edu.sg/handle/10635/48504
Appears in Collections:Master's Theses (Open)

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