Characterization of Ultramicropores and Analysis of Their Evolution in Tectonically Deformed Coals by Low-Pressure CO2 Adsorption, XRD, and HRTEM Techniques

Porosity in coal is the main space and migration channel for coalbed methane, and more than 90% of the specific surface area of coal comes from ultramicropores (<1.1 nm), which are expected to be a...