How pore structure of coal can be affected by peatificatiion and coalification processes?
Answers
1. Introduction
Deformation and metamorphism could occur in coal to different extents under stable pressure conditions after coal is formed. As a complex organic material with a complicated porous structure, coal has been studied by many researchers on the relationships between the macromolecular structure and the nanopore structure [1–3]. Duber and Rouzaud discussed the change between the pores and the macromolecular structure of coal and proposed that the size and shape of the pores in coal depend on coalification, the temperature, and the anisotropic stress, which can affect the metamorphic grade of coal . Cao et al. considered that tectonic stress could affect the chemical structure of coal, thereby leading to changes in the macromolecular structure, which could affect the nanopore structure (<100 nm) and its distribution.