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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 ...

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 ...

The effect of acid washing on the pyrolysis products derived from a vitrinite-rich bituminous coal

Roets, Leon; Strydom, Christien A.; Bunt, John R.; Neomagus, Hein W.J.P.; Van Niekerk, Daniel (Elsevier, 2015)

Extensive characterization of the pyrolysis products, derived from raw and acid washed samples of a vitrinite-rich South African bituminous coal is reported. Pyrolysis experiments were carried out with use of a modified ...

The effect of added minerals on the pyrolysis products derived from a vitrinite-rich demineralised South African coal

Roets, Leon; Bunt, John R.; Neomagus, Hein W.J.P.; Strydom, Christien A.; Van Niekerk, Daniel (Elsevier, 2016)

A better understanding of the behaviour of the inorganic matter present in coal will assist in more cost-effective operations and more consistency in product yield and composition during thermal processing. In this study, ...

Modeling the nonisothermal devolatilization kinetics of typical South African coals

Hattingh, Burgert B.; Everson, Raymond C.; Neomagus, Hein W.J.P.; Bunt, John R.; Van Niekerk, Daniel (ACS, 2014)

Multicomponent model fitting was conducted in order to evaluate the devolatilization rate behavior of four typical South African coals, with the aid of nonisothermal thermogravimetry. Rate evaluation was conducted at four ...

Elucidation of the structural and molecular properties of typical South African coals

Hattingh, Burgert B.; Everson, Raymond C.; Neomagus, Hein W.J.P.; Bunt, John R.; Van Niekerk, Daniel; Jordaan, Johan H.L.; Mathews, Jonathan P. (ACS, 2013)

Advanced analytical techniques were performed on four South African coals, three noncoking and one coking, containing different maceral contributions (vitrinite contents ranging between 24 and 66 vol %, m.m.f.b.). ...