Enhancement of Bio-H 2 Purification Performance in a Multi-Stage Desulfurization Process Using Mining Waste and LaNi 5

Shuto Kitayama (), Mayu Hamazaki, Shoichi Kumon, Kimitaka Sato and Kiyoshi Dowaki ()
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Shuto Kitayama: Department of Industrial and Systems Engineering, Faculty of Science and Technology, Tokyo University of Science, Chiba 278-8510, Chiba, Japan
Mayu Hamazaki: Department of Industrial and Systems Engineering, Faculty of Science and Technology, Tokyo University of Science, Chiba 278-8510, Chiba, Japan
Shoichi Kumon: DOWA Holdings Co., Ltd., Tokyo 101-0021, Japan
Kimitaka Sato: DOWA Holdings Co., Ltd., Tokyo 101-0021, Japan
Kiyoshi Dowaki: Department of Industrial and Systems Engineering, Faculty of Science and Technology, Tokyo University of Science, Chiba 278-8510, Chiba, Japan

Energies, 2025, vol. 18, issue 4, 1-13

Abstract: The fuel-cell (FC) power system, utilizing biohydrogen from biomass resources, is a promising alternative to fossil fuels. However, hydrogen sulfide (H 2 S) in bio-syngas can severely degrade FC performance and increase environmental impact, necessitating impurity removal. This study investigates a multi-stage desulfurization process using neutralized sediment (NS) and a metal hydride (LaNi 5 ) as H 2 S adsorbents. NS, a mining waste material, can potentially reduce environmental impact when repurposed as an adsorbent, with its performance influenced by pore configuration and Fe content. However, the purified gas does not fully meet FC fuel specifications. To address this, LaNi 5 , which selectively absorbs and releases hydrogen, was incorporated to achieve higher purification levels. In our study, H 2 S adsorption tests were conducted using two fixed-bed flow reactors heated to 250 °C, where a gas mixture containing 196 ppm of H 2 S flowed through the system. The proposed multi-stage system achieved a breakthrough time of 182.5 h with purified gas remaining under 0.1 ppm and an adsorption capacity of 16.4 g/g-sorbent. These results demonstrate the high desulfurization performance achieved using NS and LaNi₅.

Keywords: hydrogen; biomass; desulfurization; hydrogen purification; neutralized sediment; metal hydride (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: 2025
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