Browsing Doctoral Degrees (Chemistry) by Title
Now showing items 40-59 of 116
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Heterometallic ruthenium (II)-platinum (II) complexes : a new paradigm : a kinetic, mechanistic and computational investigation into substitution behaviour.
(2014-10-17)Abstract available in PDF file. -
The hydrogenolysis of glycerol to lower alcohols.
(2010)Much work has been done towards the hydrogenolysis of glycerol to 1,2-PDO and 1,3-PDO using various heterogeneous systems including Rh, Ru, Pt, PtRu, copper systems and Raney Ni in batch systems. However, routes to lower ... -
Hydrogeochemical modeling of the speciation and leaching of fly ash co-disposed with water, brines and organics : a case study of Sasol-Eskom coal ash disposal, South Africa.
(2013-12-06)Two coal utility plants in South Africa selected (one from Sasol and another from Eskom) for this study produce large volumes of fly ash (over 40 Mt from Eskom at Tutuka, and 3 Mt from Sasol Synfuels at Secunda annually), ... -
Imidazolium, phosphonium and pyridinium ionic liquids with flourinated anions : synthesis characterization and applications.
(2013)Four sets of ionic compounds were synthesized, each with an organic spacer between two ligands creating a dication with the bromide as the counter anion. In each of the sets of ionic compounds, the counter anion was ... -
The incorporation of impurities into sucrose crystals during the crystallisation process.
(1998)The main objective of this work is to propose a mechanism for the transfer of impurities into the sucrose crystal. To this end the transfer of impurities into the sucrose crystal was investigated, under crystallisation ... -
Influence of bridging groups on the reactivity of dinuclear platinum (II) complexes with bis(2-pyridylmethyl)amine chelate headgroups.
(2009)The influence on the reactivity of both the length as well as the structural nature of diamine bridges linking dinuclear Pt(II) complexes with homotopic bis(2-pyridylmethyl)amine headgroups has been investigated. For this ... -
Influence of bridging groups on the reactivity of dinuclear platinum (II) complexes with bis(2-pyridylmethyl)amine chelate headgroups.
(2009)The influence on the reactivity of both the length as well as the structural nature of diamine bridges linking dinuclear Pt(II) complexes with homotopic bis(2-pyridylmethyl)amine headgroups has been investigated. For this ... -
Investigating the pathway and fate of inorganic impurities in a bisulfite dissolving pulp production process.
(2011)This study sought to investigate the pathway and fate of metals and Si in a bisulfite pulp production process, at the same time providing a means to mitigate on the residual metals bound in the final pulp. The metals ... -
An investigation of the solvent extraction kinetics of Germanium by 7- alkylated.-8-hydroxyquinoline extractants.
(1990)Equilibrium and kinetic data for the solvent extraction of germanium by three impure commercial 7-alkylated-8hydroxyquinoline extractants which vary in structure at the 7alkyl group, are evaluated in order to elucidate ... -
Investigations in dienamine chemistry.
(1991)Reaction of the pyrrolidine dienamines of ~1,8a-2-octalones with methyl vinyl ketone is complex. In methanol as solvent, the reaction occurs primarily with the linear dienamine isomer and results in annulation of the ... -
Investigations into the reactions of enamines and imines.
(1990)The alkylation of 2-methylcyclohexanone imines using methyl acrylate has been investigated with a view to optimising the reaction conditions. The mechanism of this alkylation reaction has been investigated and it has been ... -
Isolation and identification of novel compounds from indigenous plants.
(1993)Abstract available in pdf file. -
The mechanism of the selective inotropic and hypotensive effects of triterpenoids of plant origin.
(2015)Abstract available in PDF file. -
N-heterocyclic carbene-iron(II) complexes : chemistry and application as transfer hydrogenation catalysts.
(2013-11-27)In the last decade N-heterocyclic carbene (NHC) ligands have become important in organometallic chemistry and homogeneous catalysis, rivalling the well established phosphines. Most of the current attention to date has ... -
Nitrogen- and phosphine-donor ruthenium(II/III) and palladium(II) complexes : synthesis and catalytic hydrogenation of ketones, alkenes and alkynes.
(2016-02-29)The ligands, 2-(2-pyridyl)benzimidazole (L1), 2-(2-pyridyl)bezothiazole (L2), and 2-(2-pyridyl)bezoxazole (L3) were prepared from o-phenylenediamine, o-aminothiophenol and 2-aminophenol, respectively, following literature ... -
Nitrogen-donor late transition metal complexes as ethylene oligomerization catalysts.
Abstract available in PDF file. -
Nitrogen-doped carbon nanotubes : controlled synthesis, physicochemical characterization and application as Pd catalyst supports in a hydrogenation reaction.
(2015)Catalysis is a fundamental pillar in the development of a sustainable economy that is in line with the principles of green chemistry. This drives the need to develop novel catalytic systems whose activity and selectivity ... -
Organic flame retardants in the indoor environment.
(2016-04-08)Flame retardants (FRs) have become ubiquitous contaminants found in humans, animals, various outdoor environments, e.g. air, soil, sediment, etc., and indoor environments particularly, homes, automobiles, classrooms and ... -
Oxidation and oxidative dehyrogenation of n-octane using V₂O₅ supported on hydroxyapatites.
(2012)Vanadium pentoxide with loadings varying from 2.5-15 wt% was supported on hydroxyapatite (HAp) by the wet impregnation technique. The materials were characterized by techniques such as X-ray powder diffraction (XRD), ...
