Hydrogenation is one of the major processes used in commercial and academic applications in the manufacture of chemical intermediates; high tonnage products of high value, and useful chemicals, such as agrochemicals and pharmaceuticals. Free solvent hydrogenation of cyclohexanol using Au, Au:Pd and Pd/CsxH0.5PW12O40 catalysts have been performed in the liquid phase. Reaction conditions, for example supports with/without Cs-salt loading, metal loading and/or ratio were varied to achieve ideal conditions. The Palladium supported on Cs2.5H0.5PW12O40 is a successful catalyst for such hydrogenation, and Cs2.5H0.5PW12O40 has been shown to be the best of the supports investigated for the preparation of catalysts using the impregnation method. Pd, Au and Au:Pd catalysts supported on TiO2 have been used for the hydrogenation of furfuryl alcohol and furfural with H2 at room temperature. The influence of the pressure, catalyst mass, support, Au:Pd variation, Pd loading and solvent have been investigated. In addition, Ru and Ru:Pd was studied with furfural, and also the effect of Ru:Pd ratios. The selective hydrogenation of both Furfuryl alcohol and Furfural into 2-methylfuran was investigated at room temperature using Palladium supported catalysts. This study has shown that Pd/TiO2 catalysts can be very effective for the synthesis of 2-methylfuran at room temperature and low pressure hydrogen (1-3 bar). The effect of various reaction conditions (pressure, catalyst amount, and solvent) has been studied. Controlling the catalyst composition can control the selectivity to molecules with multiple functioning groups, and reaction conditions can promote or hinder the various reaction pathways, thus increasing selectivity to the desired hydrogenation yields.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:629846 |
| Date | January 2014 |
| Creators | Aldosari, Obaid |
| Publisher | Cardiff University |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Source | http://orca.cf.ac.uk/67364/ |
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