Abstract
Objective of the studies is to measure and determine regularities of changes in adsorption and methane energy bond with the open surface of mineral carbons within metamorphism series. Donbas mineral carbons have been used as the samples. Volumetric method has been applied in the range of room temperatures and pressures of free methane phase (i.e. 0.015 to 3.5 MPa) to measure methane amount at the open surface of the mineral carbons. Depending upon changes in carbon content, adsorption behaviour is close to parabolic one: adsorption is maximal on the peripheries of metamorphic series, and minimal within its central part. For the first time, methane energy bond with the open surface of mineral carbons has been determined. In the context of the metamorphic series, bonding energy varies from 2 to 10 kJ/mol. Direct linear dependence of adsorption from pressure takes place for coal where carbon content is less than 76 %. It is the result of effect of large area of open surface of low-metamorphized coal. Inversely, nonlinear dependence is observed as for anthracite. The authors connect the fact with filling of all spaces at the open surface when gas phase pressure is 0.1 MPa.
Highlights
Due to the short period of physical adsorption, gas emission from solid body surface takes fractions of a second
It can be explained by the fact that coal with low metamorphic intensity has large open surface, gas access to which is provided by means of heavy-gauge pores and fissures
Regularity of methane energy bond variation has been determined as well as adsorption volume at the surface dry mineral carbons of metamorphic series over room temperature range when methane pressure is more than 0.1 MPa or less than it
Summary
Due to the short period of physical adsorption, gas emission from solid body surface takes fractions of a second. Similar phenomenon is possible during coal-methane system reactivation or when coal is separated from a gas-bearing seam In such a case, emission of the adsorb methane effects both level and rate of change in gas content of a face zone. Measurements within 0.9-3.5 MPa range have shown that in the context of mineral carbons where carbon content is less than 84 %, dependence of Qads on P is close to linear one in terms of the whole pressure range. It can be explained by the fact that coal with low metamorphic intensity has large open surface, gas access to which is provided by means of heavy-gauge pores and fissures. Papers [17, 18] inform on the similar Qads dependence upon P for mineral carbons with low metamorphic intensity.
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