| Abstract |
Supercritical CO2 (ScCO2) extraction could improve the bioavailability of coal for the enhancement of biogenic methane production. Here, the influence of prolonged ScCO2 extraction on methane yield was investigated since in-situ ScCO2 injection is time-consuming. The results showed that the enhancement of biomethane production from coal was negatively correlated with extraction time and extraction yield. With the extension of ScCO2 extraction time from 0.5 day to 28 days, the methane yield of extracted coals increased by 20.1∼111.4% than that of raw coal. ScCO2 mainly reacted with the organic structures on the surface of coal (such as the C-O and CH2-CO), rarely the skeleton structure. In the prolonged extraction, aromatics were first extracted, then oxygen-containing matters and aliphatics which reduces the methane production of extracted coal but increases the methane generation potential of extractable organic matter. Then, a conceptual model of ScCO2-MECBM was proposed for enhancing methane recovery in-situ. |
| Authors |
Feng Xu  , Zizhong Zhang , Hongguang Guo , Zhigang Li , Zaixing Huang  , Michael A. Urynowicz
|
| Journal Info |
Elsevier BV | The Journal of Supercritical Fluids , vol: 201
, pages: 106023 - 106023
|
| Publication Date |
10/1/2023 |
| ISSN |
0896-8446 |
Type |
article |
| Open Access |
closed
|
| DOI |
https://doi.org/10.1016/j.supflu.2023.106023 |
| Keywords |
Microbial Methane Generation (Score: 0.530866) , CO2 Sequestration (Score: 0.519912) , Methane Adsorption (Score: 0.505476) , Coalbed Methane (Score: 0.50102) , Coal Permeability (Score: 0.500946)
|
