Browsing Masters by Department "Centre for Catalysis Research"

Now showing items 1-20 of 24

Aromatization of alkenes by gallium/H-ZSM-5 zeolite catalysts

Author: Nash, Robin John Date: 1994 Gallium/H-ZSM-5 zeolite catalysts have been extensively researched for the aromatization of liquified petroleum gas (LPG). In 1989 BP and UOP collaborated to commission a pilot plant in Grangemouth, Scotland, for the aromatization of propane ... Read more
[Ca₂₄Al₂₈O₆₄]⁴⁺(e⁻)₄ electride as a novel support system for iron-based Fischer-Tropsch synthesis

Author: Motala, Muhammad Date: 2018 Iron-based Fischer-Tropsch (FT) technology is well established in the industrial production of hydrocarbon resources. The use of a stable inorganic electride as a support system, with potential promoter effects which could replace commonly ... Read more
Characterisation of acidic/basic properties of alumina supports

Author: Ferreira, Riki Date: 2002 Previous experience with the preparation and testing of Co/alumina catalysts for Fischer-Tropsch synthesis has revealed that, while commercial available aluminas result in materials of signiﬁcantly different catalytic performance, no correlation ... Read more
Characterization of gold catalysts for methanol synthesis

Author: Van Heerden, Tracey Date: 2012 The activity (per mass of catalyst) of supported gold catalysts across a range of reduction and oxidation reactions is significantly affected by the average crystallite size of the gold crystallites in the catalyst. Supported gold catalysts ... Read more
Development of bimetallic Pd-Zn catalysts for methanol steam reforming: hydrogen production for fuel cells

Author: Xalabile, Philasande Date: 2015 Proton exchange membrane fuel cell (PEMFC) has been reported as clean and efficient energy technology from conversion of H₂. However, one of the main challenges remains the storage and transport of hydrogen. The promising alternative is to ... Read more
DFT insight into the oxygen reduction reaction (ORR) on the Pt₃Co(111) surface

Author: Matsutsu, Molefi Date: 2012 Proton exchange membrane fuel cells (PEMFC) are identified as future energy conversion devices, for application in portable and transportation devices. The preferred catalyst for the PEMFC is a Pt-catalyst. However, due to the slow oxygen ... Read more
Factors influencing the catalytic activity of Fe-ZSM-5 during the catalytic conversion of N₂O

Author: Van der Walt, Franschua Johan Date: 2015 Zeolites have found widespread applications as acid catalysts for decades. By introducing transition metal ions in the cation position, the zeolite is transformed into a redox catalyst. The nature of the trivalent heteroatom influences the ... Read more
High throughput experimentation: a validation study for use in catalyst development

Author: Luchters, Niels Date: 2016 High throughput and combinatorial experimentation is becoming more and more used in catalysis research. The benefits of parallel experiments are not only limited to shorten the time - to - market, but also give opportunities to study the ... Read more
The hydrocracking of Fischer-Tropsch wax : using n-tetradecane as a model compound

Author: Kotsiopoulos, Athanasios Date: 2005 Increasingly stringent legislation has been applied to transportation fuels to minimise or eliminate aromatics and sulphur compounds in diesel fuel. This has led to manufacturers determining alternative production methods to comply to ... Read more
Hydrocracking of long chain n-Paraffins under Fischer-Tropsch conditions

Author: Koen, Matthew Anthony Date: 2014 A number of various iron-palladium loaded H-MFI zeolites used for the hydrocracking of n- hexadecane under Fischer-Tropsch conditions were tested to address the inherent low CO tolerance of the pure palladium noble metal hydrocracking catalysts. ... Read more
The hydrocracking of long chain n-paraffins under Fischer-Tropsch conditions

Author: Binneman, Jacqueline Date: 2012 Interest in the area of hydrocracking has grown rapidly over the years. In the early 1960's companies such as Chevron and Universal Oil Products (UOP) introduced new hydrocracking processes to manufacture high octane gasoline. The demand for ... Read more
In situ study of Co₃O₄ morphology in the CO-PROX reaction

Author: Khasu, Motlokoa Date: 2017 The preferential oxidation (PROX) reaction is an effective process for the removal of trace amounts of carbon monoxide from a reformate stream. Tricobalt tetraoxide (Co₃O₄) is the candidate for CO-PROX in a H₂ rich gas and could be an alternative ... Read more
Influence of catalyst ink mixing procedures on catalyst layer properties and in-situ PEMFC performance

Author: Jacobs, Clayton Jeffrey Date: 2016 Despite the benefits of fuel cell technology its advancement to being commercially functional is hindered by a number of crucial factors. These factors are often associated with the lack of appropriate materials or manufacturing routes that ... Read more
Influence of particle size and morphology of Pt₃Co/C on the oxygen reduction reaction

Author: Hlabangana, Ntandoyenkosi Date: 2015 Polymer electrolyte fuel cells have shown great potential in providing clean energy with no emissions. The kinetics of the cathode reaction, i.e. the oxygen reduction reaction (ORR) are sluggish necessitating high loadings of the catalyst ... Read more
Investigation into the behaviour of a wash-coated PGM-based catalyst layer onto micro-channel reactors for the steam reforming of methane

Author: Van Niekerk, Wesley Date: 2017 A wash-coating method which had originally been used for wash-coating a Rh/Al₂O₃ catalyst onto stainless steel micro-channels (MC) for the reforming of propane [24] was tested in the steam reforming of methane. The robustness of this method ... Read more
Iron modification of rhodium nano-crystallites for CO hydrogenation

Author: Nozonke, Dumani Date: 2013 The aim of this study was to investigate the effect of iron on alumina-supported well defined nano-sized rhodium crystallites on the activity and selectivity for CO hydrogenation. The objective was to prepare model catalysts with similar ... Read more
Isomerisation of cresols over zeolites HZSM5, HBeta and HMordenite

Author: Hunt, Raymond Cedrick Date: 2005 In the natural (phenolic material obtained from coal) phenolics industry two problems are experienced with regards to cresol isomers. Firstly, insufficient quantities are recovered from natural sources such as coal tar and refinery caustics ... Read more
Kinetic models for the Pt/CeO₂ catalysed water-gas shift reaction

Author: Brown, Darryl Edward Date: 2018 As the global population grows, so does the world's demand for energy. Consequently, there exists an increased interest in the development of fuel cells for power generation due to their low greenhouse gas emissions. For fuel cells to be a ... Read more
Performance of gold catalysts for low temperature water gas shift

Author: Roberts, Stephen Date: 2001 The ultimate objective of the study was to investigate the performance of suitably prepared gold catalysts for low temperature water gas shift (LTS) - and more specifically to investigate the performance of these catalysts at temperatures ... Read more
Preferential oxidation of carbon monoxide in hydrogen-rich gases over supported cobalt oxide catalysts

Author: Nyathi, Thulani Mvelo Date: 2016 The preferential oxidation of CO (CO-PROX) has been identified as one route of further reducing the trace amounts of CO (approx. 0.5 - 1 vol%) in the H2-rich reformate gas after the high- and low-temperature water-gas shift reactions. CO-PROX ... Read more