Effect of supercritical-CO2 interaction time on the alterations in coal pore structure.
KHSM Sampath, I Sin, MSA Perera, SK Matthai, PG Ranjith, Li Dong-yin
Journal of Natural Gas Science and Engineering | Elsevier BV | Published : 2020
The supercritical CO2 (S-CO2) interaction time is a vital parameter in CO2 geo-sequestration in coal seams, which is under-evaluated up to date. Through this study, we provide an experimental insight into this aspect by evaluating the effect of S-CO2 interaction time on the coal pore structural alterations. The results revealed that the S-CO2 pre-exposure has a notable impact on the adsorption capacity of coal, in which short-term (order of hours) and long-term (order of weeks) S-CO2-treated coal show less and higher adsorption capacities, respectively, compared to untreated coal. The pore characterisation results infer that both surface area and pore volume are decreased by about 20% after ..View full abstract