Browsing by Advisor/Supervisor
Now showing items 1-12 of 12
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Design and characterization of asymmetrical porous nickel membranes
(North-West University, 2006)As an alternative to organic membranes, ceramic membranes are suitable for the chemical industry due to their intrinsic thermal, chemical and mechanical stability. The centrifugal dispositioning technique has the advantage ... -
Leaching kinetics of synthetic heazlewoodite
(North-West University, 2004)The sources of base metals are mainly in the form of oxides or sulphides, of which the sulphides are predominantly present in South Africa. These metals are intergrown platinum group and base metals in the form of alloys ... -
Membrane facilitated separation of NF3 and CF4
(North-West University, 2013)Nitrogen trifluoride (NF3) is frequently used as a source of fluorine in the electronics device manufacturing industry as a dry etchant during plasma assisted etching of silicon wafers, or during the plasma cleaning of ... -
Modelling atmospheric chemical transformations under South African conditions
(Potchefstroom University for Christian Higher Education, 2000)South Africa is in the process of adapting to new social and economical structures. The government has made it clear that the creation of work and economic growth is of the utmost importance. This policy will put South ... -
Molecular modelling study of alkene metathesis with phosphine ligated Grubbs-type precatalysts
(North-West University, 2014)In this study, an attempt was made to identify the electronic and steric properties of the precatalyst ligands that determine the characteristics of phosphine ligated Grubbs-type precatalysts for alkene metathesis by means ... -
'n Ondersoek van alkynmetatese deur middel van molekuulmodellering en laboratoriumeksperimentering
(North-West University, 2004)In this study, the metathesis reaction of alkynes was investigated with the classic Mo(CO)6/PhOH-catalyst system by utilizing both laboratory experimentation and molecular modelling. The reaction was optimized by using ... -
The partition behavior and the chemical speciation of selected trace elements in a typical coal sample during pyrolysis
(North-West University, 2008)Sasol is by far the world's leading company in upgrading of low-grade coal into high value chemicals and fuels. Such plants also utilise fine particles or pulverised coal in the combustion process to generate steam and ... -
Separation of tantalum and niobium by solvent extraction
(North-West University, 2012)Niobium (Nb) and tantalum (Ta) are found in the same group (VB) of the periodic table of elements and therefore have similar chemical properties, which is the reason why they are difficult to separate. They are usually ... -
Separation of zirconium and hafnium via solvent extraction
(North-West University, 2010)Zirconium metal (Zr) is highly desirable as a cladding material for nuclear fuel rods in nuclear power plants, because of its very low nuclear absorption cross-section for thermal neutrons, however to use this Zr metal it ... -
Separation of Zr and Hf via fractional crystallization of K2Zr(Hf)F6 : a theoretical and experimental study
(North-West University, 2009)Due to the low absorption cross section for thermal neutrons of zirconium (Zr) in contrast to hafnium (Hf), Zr-metal must essentially be Hf free (<100 ppm Hf) to be suitable for use in nuclear reactors. However, Zr and Hf ... -
Stikstofoksiedvorming in huishoudelike osoongenerators
(North-West University, 2006)Ozone (03) is used as a steriliser of air and water, but the nitrogen oxides (NOx) are harmful to man and the environment. Ozone generators excite electrons to higher energy levels so that O3 and NOx can be manufactured ... -
Synthesis and modelling of imine derivatives as ligands for Grubbs type pre–catalysts
(North-West University, 2010)The Grubbs type pre–catalysts are widely used for olefin metathesis. The pre–catalysts exhibit high activity and selectivity, but low stability and short lifetimes Salicylideneanilines (SA) are Schiff bases that can be ...
