Speaker
Description
The imperative shift towards a decarbonized hydrogen economy necessitates a transition from the current reliance on unabated fossil fuel-based hydrogen production, which results in significant CO2 emissions. This study proposes a novel approach to address this challenge by introducing a groundbreaking concept for the simultaneous separation of hydrogen (H2) and permanent storage of carbon dioxide (CO2) within depleted coalbed methane (CBM) reservoirs. This study investigates CO2-H2 competitive sorption in sub-bituminous and anthracite coals, addressing experimental challenges and model limitations. The experimental sequence included initial sorption tests with pure CO2 and H2 gases, followed by adsorption of the pre-mixed CO2-H2 mixture and the subsequent desorption after each adsorption equilibrium. Higher pure CO2 adsorption compared to pure H2 adsorption has been observed. In pre-mixed CO2/H2 adsorption, the mixture gas adsorption isotherms confirm the competitive sorption nature of CO2-H2 in coals. These isotherms demonstrate that gas adsorption is generally lower for binary gas injection compared to their pure gas counterparts, with the effect increasing as fugacity and molar fraction of the second gas rise. Subsequent desorption of CO2/H2 mixtures under varied conditions reveals competitive sorption effects of CO2 over H2, leading to higher sorbed amounts of CO2 and lower sorbed amounts of H2, consistent with observed composition ratio changes. Solubility-selectivity analysis elucidates coal-dependent trends in CO2/H2 competitive sorption. The study emphasizes the significant impact of multicomponent scenarios on coal selectivity for CO2 and H2, cautioning against sole reliance on pure-gas data for accurate estimations.
| Country | United States |
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