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Coal Seams as an In-Situ Filter for Hydrogen Separation

APOGCE 2024 - SPE Asia Pacific Oil and Gas Conference and Exhibition
2024
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Conference Paper Description

Coal exhibits a selective sorption mechanism, making it a potential natural filtration system for gas purification. This study explores the use of coal seam gas reservoirs for the simultaneous separation and storage of carbon dioxide (CO) from a mixture of hydrogen (H) and CO, the main products of Steam Methane Reforming (SMR). In this work, we present the results of two experimental tests, conducted on a core sample from the Bowen Basin. First, we measured and characterized H sorption onto the coal sample. Then, we performed a proof-of-concept experiment-a binary-component coreflooding test- to assess the competitive sorption behavior of H and CO. The sorption measurements confirmed the low affinity of coal to H, consistent with earlier observations in the literature. We also compared the results of H sorption with the CO sorption measurements of the same core sample. The comparison demonstrated that the coal sorption capacity for CO is approximately seven times greater than its capacity for H at a pressure of 10 MPa. The coreflooding test verified that a similar sorption contrast can be expected when the coal is exposed to a mixture of H and CO. For this test, first, we equilibrated the sample with pure hydrogen and then continuously injected a mixture of H and CO with a molar ratio of 4:1. The coreflooding process showed that the injected CO displaced the adsorbed H, despite its lower partial pressure, and an efficient CO separation and storage from this mixture, was achieved. These findings highlight the potential of coal seams for dual-purpose CO storage and gas purification. The results suggest that coal's selective sorption can be potentially exploited for CO capture and storage, thereby contributing to the improvement of the sustainability of hydrogen production from fossil fuels with carbon capture, utilization and storage (CCUS).

Bibliographic Details

M. Sayyafzadeh; M. Camilleri; D. Heryanto; R. Sander

Society of Petroleum Engineers (SPE)

Earth and Planetary Sciences; Energy

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