Browsing PhD / Doctoral by Department "Centre for Catalysis Research"

Now showing items 1-11 of 11

Adding ammonia during Fischer-Tropsch Synthesis: Pathways to the formation of N-containing compounds

Author: De Vries, Christian Date: 2017 The Fischer-Tropsch synthesis (FTS) process, better known for its ability to produce synthetic fuel via the hydrogenation of CO, has shown potential to produce valuable chemicals when ammonia is added to the feed. In this work certain aspects ... Read more
Electrocatalysis of oxide-based materials for the oxygen reduction and evolution reactions

Author: Mohamed, Rhiyaad Date: 2016 Electrochemical devices, such as fuel cells and electrolysers, are said to be at the forefront of a renewable energy technology revolution centred on hydrogen as an energy carrier. These devices rely on the chemical reactions of oxygen, namely ... Read more
Hydrogen spillover in the Fischer-Tropsch synthesis: the role of platinum and gold as promoters in cobalt-based catalysts

Author: Nabaho, Doreen Date: 2015 The Low Temperature Fischer-Tropsch (LTFT) synthesis involves the catalytic hydrogenation of carbon monoxide with the aim to produce long-chained hydrocarbons. Commercial cobalt-based catalysts incorporate oxidic supports that are known to ... Read more
Initial steps of the Fischer-Tropsch sysnthesis on Fe(100) : the role of hydrogen

Author: Van Helden, Pieter Date: 2009 In this thesis the role of hydrogen in the initial steps of the Fischer-Tropsch reaction on the model Fe(100) surface is explored. The Fischer-Tropsch reaction is an industrially applied catalytic process in which synthesis gas (H2 and CO ... Read more
Investigation of the promotional effect of Cu and Ag on iron-based Fischer-Tropsch catalysts using ferrites as model catalysts

Author: Chonco, Zandile Hlengiwe Date: 2014 The Fischer-Tropsch synthesis is regarded as a stepwise polymerisation reaction between adsorbed hydrogen, carbon monoxide and monomers formed from the reaction of hydrogen and carbon monoxide. The catalytically active metals for industrial ... Read more
Methanol conversion to olefins and propene oligomerization over modified SAPO-34 and dealuminated mordenite

Author: Van Niekerk, Miles Date: 1992 SAP0-34 and mordenite, catalysts with quite different pore structures, are known to be suitable for methanol conversion to light olefins and propene oligomerization to a distillate type product, respectively. In this study, these catalysts ... Read more
Nanosized iron crystallites for Fischer-Tropsch synthesis

Author: Mabaso, Evans Itai Date: 2005 Fischer-Tropsch synthesis is the production of hydrocarbons from CO and H2. The catalytically active metals for industrial application are cobalt and iron. In this work iron-based catalysts were studied. To ensure maximum metal utilisation ... Read more
Partial oxidation of α-olefins over iron antimony oxide catalysts

Author: Schnobel, Michael Date: 1997 Iron antimony oxide has been known to be an active and selective catalyst for the partial oxidation of propene to acrolein and the oxidative dehydrogenation of 1-butene to 1,3- butadiene. It has become the preferred catalyst for the industrial ... Read more
Pt and Pt-Pd cluster interaction with graphene and TiO₂ based supports: A DFT study

Author: Matsutsu, Molefi Date: 2016 Density functional theory (DFT) calculations have been performed to gain insight into the role of defects present on the surface of graphene and TiO₂ based supports on supported metal clusters. The clusters considered are a Pt₃₈ cluster and ... Read more
SiC and B₄C as electrocatalyst support materials for low temperature fuel cells

Author: Jackson, Colleen Date: 2017 Supported nano-catalyst technologies are key for increasing the catalyst utilisation and achieving economically feasible platinum metal loadings in hydrogen polymer electrolyte fuel cells (PEFCs). High surface area carbons are commonly utilised ... Read more
A study on the effect of lateral interactions on methanation over Fe(100)

Author: Abrahams, Robin Kyle Date: 2018 In this thesis, the lateral interactions involved in conversion of synthesis gas, a mixture of H2 and CO, to methane over Fe(100) and the effect they have on the kinetics of the process is explored. Understanding the methanation of syngas ... Read more