Browsing by Subject "XRD"
Now showing items 1-10 of 12
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The characterisation of slow-heated inertinite- and vitrinite-rich coals from the South African coalfields
(Elsevier, 2015)The development of coal char structures with pyrolysis has been extensively investigated but has traditionally been focused on the carboniferous coals in the northern Hemisphere. In this investigation, the properties of ... -
Corrosion mechanism of steels in MDEA solution and material selection of the Desulfurizing equipment
(ESG, 2017)In the present study, the corrosion properties of three steel were evaluated in 45 wt.% Methyldiethanolamine (MDEA) solution, saturated to the hydrogen sulfide (H2S) and carbon dioxide (CO2) as in the oilfields. Corrosion ... -
Determination of Corrosion Inhibition Efficiency Using HPHT Autoclave by Gingko biloba on Carbon Steels in 3.5% NaCl solution Saturated with CO2
(ESG, 2014)Leaves extract of Gingko biloba (GBE) was characterized using mass spectrometry (MS) and Fourier transform infrared spectroscopy (FTIR) methods. The influence of GBE on corrosion of carbon steels (J55,N80, P110SS and C110 ... -
The experimental evaluation of nitrogen transformation in South African coal chars and the concomitant release of nitrogenous species
(North-West University, 2018)The effect of typical South African (SA) coal properties on nitrogen functional transformation and release were examined in the course of pyrolysis in a fluidised bed (FB) and drop-tube furnace (DTF). Chars were generated ... -
Influence of maceral composition on the structure, properties and behaviour of chars derived from South African coals
(Elsevier, 2015)The generation of coal chars is an important intermediate step in coal conversion processes such as combustion and gasification. The char structure impacts their behaviour in these processes. Detailed investigations on ... -
Mineralogical behaviour of North Dakota lignite in an oxygen/steam blown moving bed reactor
(Elsevier, 2013)In this study, lignite fromNorth Dakota (USA)was thermally treated in a commercial-scale oxygen/steamblown moving bed reactor at the Dakota Gasification Conpany (DGC) in order to identify mineralogical changes that occur ... -
Prediction of dissolution of copper from a chalcopyrite carbonatite ore of South Africa
(EARET, 2018)Chalcopyrite accounts for 70% of all copper bearing minerals and therefore has been studied closely to understand the dissolution kinetics in hope of overcoming the passivation film and increasing the extraction rates ... -
Relevance of electrochemical and surface studies to probe zanthoxylum schinifolium (sichuan pepper) as an effective corrosion inhibitor for N80 steel in CO₂ saturated 3.5% NaCl solution
(ESG, 2014)The inhibition of the corrosion of N80 steel in 3.5 wt.% NaCl solution saturated with CO₂ by the extract of Zanthoxylum schinifolium (ZSE) has been studied using electrochemical impedance ... -
Structural and chemical modifications of typical South African biomasses during torrefaction
(Elsevier, 2016)Torrefaction experiments were carried out for three typical South African biomass samples (softwood chips, hardwood chips and sweet sorghum bagasse) to a weight loss of 30 wt.%. During torrefaction, moisture, non-structural ... -
Towards practical applications of EQCN experiments to study Pt anchor sites on carbon surfaces
(Springer, 2018)This work investigates the viability and outlines the current challenges in electrochemical quartz crystal nanobalance (EQCN) experiments on supported Pt catalysts. EQCN experiments involving Pt supported on 2-D “surface-treated ...
