Sorption behaviors of methanol vapor by coal extracts and residues

The role of volatiles and coal structural variation in coal methane adsorption

“…7b). The newly created pore spaces become the physical diffusion sites that contribute to the enhancement of methane adsorption capacity [30,31]. This is consistent with data from Bae et al [23], who indicated that volatiles produce energy barriers that prevent adsorbed molecules from passing through the pores.…”

“…The alignment of these structures generates the coal's aggregate, crystal structure. The aggregation states reflect the stability of the carbonaceous coal matrix [30,31]. Chemically, coal consists of three-dimensional, cross-linked macromolecule networks [32].…”

“…The aggregated coal structure has been investigated using chemical methods. Takanohashi et al [30,31] prepared coal samples with different aggregation states by extracting Argonne premium coal with a solvent composed of carbon disulfide, N-methyl-2-pyrrolidinone (CS 2 -NMP), acetone, and pyridine. They found that the adsorption capacity of the solvent-extracted coal was enhanced due to newly developed pores in these less aggregated structures.…”

Difference in Extraction Yields between CS2/NMP and NMP for Upper Freeport Coal

“…It gives us a notion that diffusibility of NMP into the coal inside is inadequate in the case of extraction with NMP alone. Upper Freeport coal was reported , to have more micropores into which ordinary reagents including NMP could diffuse only marginally, while for the extraction residue after removing extract components, any solvents could easily diffuse. , …”

Experimental testing of methanol sorption on selected coal samples from Upper Silesian Basin

“…The production of active carbons from specific hard coals is also dynamically growing. Various chemical processes occurring on the coal surface involve the stage of inter-phase processes, including: oxidation, agglomeration, flotation, wetting and adsorption of gases and vapours (Takanohashi et al 2000). Like many other materials, coal substance has the ability to adsorb low-molecule substances, such as water, methanol or gases.…”