Dual-layered paper-structured catalysts for sequential desulfurization and methane-steam reforming of simulated biogas containing hydrogen sulfide
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Biogas-powered fuel cells that use low-quality biogas produced from organic waste hold a great promise for providing ultra-clean electric energy with on-site power generators. However, natural biogas contains a small amount of H2S, which causes a rapid deactivation of steam-reforming metal catalysts, such as Ni. In this work, we successfully prepared two types of paper-structured catalyst, separately containing manganese oxides (MnOx) and nickel/magnesium oxides (Ni/MgO), for desulfurization and methane-steam reforming, respectively. In the sequential desulfurization and methane-steam reforming, paper catalyst assembly, designed by stacking MnOx papers upstream and Ni/MgO papers downstream in a dual-layered form, enabled continuous hydrogen production from simulated biogas containing ca. 2000 ppm H2S impurities, whereas single-layered Ni/MgO papers immediately lost their catalytic activity due to the H2S poisoning. This combination of flexible, stackable, and easy-to-handle paper-structured catalysts has the potential to improve the energy efficiency and to process economics of providing hydrogen to biogas-powered fuel-cell systems.
This research was supported by the Science and Technology Research Partnership for Sustainable Development (SATREPS), an international joint research program promoted by the Japan Science and Technology Agency (JST)/Japan International Cooperation Agency (JICA), and by a Grant-in-Aid for Scientific Research (B: 25289250) from the Ministry of Education, Culture, Sports, Science and Technology, Japan.
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