Browsing Faculty of Engineering by Author "Phiri, Zebron"
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The effect of acid demineralising bituminous coals and de-ashing the respective chars on nitrogen functional forms
Phiri, Zebron; Everson, Raymond C.; Neomagus, Hein W.J.P.; Wood, Barry J. (Elsevier, 2017)An opportunity presented itself to compare changes in nitrogen functional forms brought by the acid treatment of South African bituminous coals and their respective chars. X-ray photoelectron spectroscopy (XPS) was used ... -
Release of nitrogenous volatile species from South African bituminous coals during pyrolysis
Phiri, Zebron; Everson, Raymond C.; Neomagus, Hein W.J.P.; Engelbrecht, Andre D.; Wood, Barry J. (ACS, 2018)The influence of typical South African coal attributes on the release of nitrogen into the volatile stream during pyrolysis was studied by utilizing three bituminous coals. The majority of South African coals are characterized ... -
Transformation of nitrogen functional forms and the accompanying chemical-structural properties emanating from pyrolysis of bituminous coals
Phiri, Zebron; Everson, Raymond C.; Neomagus, Hein W.J.P.; Wood, Barry J. (Elsevier, 2018)Characterisation of simultaneous changes in nitrogen functionalities and condensed aromatic crystallites during pyrolysis of bituminous coals was conducted. X-ray photoelectron spectroscopy (XPS) was utilised to determine ...