气体吸附法测定煤岩比表面积结果探讨分析

Researched on different characterization methods of specific surface, liquid nitrogen adsorption experiment, carbon dioxide adsorption experiment and adsorption isothermal experiment were done with coal samples from Hancheng. Results show that: the volume of Langmuir from isothermal adsorption experiment and D-R model from liquid nitrogen adsorption experiment indicate a positive correlation relationship between specific surface of micropore and adsorption capacity of methane, while a weak correlation under the BET model. The carbon dioxide representation in specific surface of micropore is more effectively to reflect the adsorption capacity of coal than the BET model, which infers that the D-R model is more suitable. The carbon dioxide representation in specific surface of micropore could reflect the coal adsorption capacity indeed. In view of the pore in coal has the characteristics of small pore size and complex pore structure, the D-R model from carbon dioxide adsorption experiment is more effectively to describe the adsorption capacity of micropore in coal.