Browsing Faculty of Engineering by Author "Roberts, Mokone J."
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The characterisation of slow-heated inertinite- and vitrinite-rich coals from the South African coalfields
Roberts, Mokone J.; Everson, Raymond C.; Neomagus, Hein W.J.P.; Okolo, Gregory N.; Van Niekerk, Daniel (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 ... -
Chemical–structural properties of South African bituminous coals: insights from wide angle XRD–carbon fraction analysis, ATR–FTIR, solid state 13C NMR, and HRTEM techniques
Okolo, Gregory N.; Neomagus, Hein W.J.P.; Everson, Raymond C.; Roberts, Mokone J.; Bunt, John R. (Elsevier, 2015)The chemical–structural properties of four South African bituminous coals were investigated using wide angle X-ray diffraction–carbon fraction analysis (WAXRD–CFA), attenuated total reflection Fourier transform infra-red ... -
Comparing the porosity and surface areas of coal as measured by gas adsorption, mercury intrusion and SAXS techniques
Okolo, Gregory N.; Everson, Raymond C.; Neomagus, Hein W.J.P.; Roberts, Mokone J.; Sakurovs, Richard (Elsevier, 2015)In this paper, we compare the surface area, porosity and other physical–structural properties of four bituminous coals from three different coal fields of South Africa determined using carbon dioxide (CO2) and nitrogen ... -
Density functional theory molecular modelling and experimental particle kinetics for CO2-char gasification
Roberts, Mokone J.; Everson, Raymond C.; Neomagus, Hein W.J.P.; Van Sittert, Cornelia G.C.E.; Okolo, Gregory N. (Elsevier, 2015)Experimental measurements and DFT atomistic modelling were conducted to elucidate the mechanisms for gasification chemistry of char with CO2 gas. The molecular models used were based on experimental representations of coal ... -
Influence of maceral composition on the structure, properties and behaviour of chars derived from South African coals
Roberts, Mokone J.; Everson, Raymond C.; Neomagus, Hein W.J.P.; Branken, David J.; Van Niekerk, Daniel (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 ...