Hydrogen Yield Enhancement in Biogas Dry Reforming with a Ni/Cr Catalyst: A Numerical Study

Akira Nishimura (), Souta Yamada, Ryoma Ichii, Mizuki Ichikawa, Taisei Hayakawa and Mohan Lal Kolhe
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Akira Nishimura: Division of Mechanical Engineering, Mie University, Tsu 514-8507, Japan
Souta Yamada: Division of Mechanical Engineering, Mie University, Tsu 514-8507, Japan
Ryoma Ichii: Division of Mechanical Engineering, Mie University, Tsu 514-8507, Japan
Mizuki Ichikawa: Division of Mechanical Engineering, Mie University, Tsu 514-8507, Japan
Taisei Hayakawa: Division of Mechanical Engineering, Mie University, Tsu 514-8507, Japan
Mohan Lal Kolhe: Faculty of Engineering and Science, University of Agder, Jon Lilletuns vei 9, NO 4879 Grimstad, Norway

Energies, 2024, vol. 17, issue 21, 1-19

Abstract: This numerical study investigates the impact of the reaction temperature, molar ratio of CH 4 :CO 2 , and catalyst porosity ( ε p ) on the H 2 yield and H 2 selectivity during biogas dry reforming over a Ni/Cr catalyst. Using COMSOL Multiphysics, we conducted detailed simulations to elucidate the underlying reaction characteristics. Our findings reveal that increasing ε p from 0.1 to 0.95 significantly provides a 5 times increase in H 2 production and a 2.3% increase in H 2 selectivity while simultaneously reducing CO selectivity by 2.3%. This effect is attributed to the improved mass transfer within the catalyst bed, leading to more efficient reactant conversion and product formation. Additionally, we observed a strong correlation between higher reaction temperatures and increased H 2 yield and H 2 selectivity. By optimizing these operational parameters, our results suggest that Ni/Cr catalysts can be effectively employed for the sustainable production of H 2 from biogas.

Keywords: biogas dry reforming; Ni/Cr catalyst; numerical simulation; reaction characteristics; catalyst porosity; H 2 production (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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