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  4. Methanogenic activity in water-saturated reservoir analogues for underground hydrogen storage: The role of surface area
 
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2024
Journal Article
Title

Methanogenic activity in water-saturated reservoir analogues for underground hydrogen storage: The role of surface area

Abstract
The activity of methanogenic Archaea in porous formations is influenced by various pore characteristics, including porosity, surface area, and the gas-liquid interfacial area. This study explores the impact of surface area on methanogenic activity using techniques such as MICP, NMR, SEM, and μCT. The cells of Methanothermococcus thermolithotrophicus, ranging from 1 to 2 μm, indicate that pores smaller than this threshold are not accessible for microbial traversal and colonization. Upon normalization of microbial activities based on pore volume and interfacial area, the findings exhibit strong correlations with specific surface areas of accessible pores in the examined rocks, as determined by MICP, NMR, and SEM. These areas ranged from 0.001 to 0.017 m2/g, 0.003-0.024 m2/g, and 0.012-0.02 m2/g, respectively. The normalized activities increase from 0.19 to 0.44 mM/(h·cm3·cm2) with an increase in the specific surface area, varying by method. Furthermore, an empirical model has been established to quantitatively evaluate hydrogen loss during underground hydrogen storage or the efficiency of bio-methanation, incorporating pore volume, specific surface area, and interfacial area.
Author(s)
Khajooie, Saeed  
RWTH Aachen University  
Gaus, Garri
Fraunhofer-Einrichtung für Energieinfrastrukturen und Geothermie IEG  
Seemann, Timo
RWTH Aachen  
Klaver, Jop  
RWTH Aachen  
Claes, Hannes  
KU Leuven
Nehler, Mathias  orcid-logo
Fraunhofer-Einrichtung für Energieinfrastrukturen und Geothermie IEG  
Ahrens, Benedikt  orcid-logo
Fraunhofer-Einrichtung für Energieinfrastrukturen und Geothermie IEG  
Littke, Ralf  
RWTH Aachen  
Journal
International journal of hydrogen energy  
Open Access
DOI
10.1016/j.ijhydene.2024.09.395
Language
English
Fraunhofer-Einrichtung für Energieinfrastrukturen und Geothermie IEG  
Keyword(s)
  • specific surface area

  • Microbial activity

  • Underground hydrogen storage

  • Pore size distributions

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