Document Type

Conference Paper

Publication Date


Publication Details

This conference paper was originally published as Beamish, B, Laxminarayana, C and Crosdale, PJ, Contrasts in methane sorption properties between New Zealand and Australian coals, in Aziz, N (ed), Coal 1998: Coal Operators' Conference, University of Wollongong & the Australasian Institute of Mining and Metallurgy, 1998, 561-565.


High pressure microbalance investigations have produced results for both New Zealand and Australian coals which show fundamental differences in their methane sorption properties. New Zealand high volatile bituminous C rank coals have a methane adsorption capacity of 38 cc/g( dan which decreases to a minimum of 23 cclg( dan at medium volatile bituminous rank and increases to 31 cc/g( dan at low volatile bituminous rank. Vitrinite-rich coal samples from Australia display a similar trend, but, the methane adsorption capacity is approximately 8 cc/g higher than for New Zealand coals at low volatile bituminous rank increasing to 20 cc/g higher at high volatile bituminous A rank. From these differences it is implied that New Zealand coals contain a lower proportion of microporosity than Australian coals, most likely due to the presence of volatile components blocking the micropore structure making them unable to sorb as much methane.