Overview of hydrogen production technologies from biogas and the applications in fuel cells

Traditionally, H2 is a large-scale production by the reforming process of light hydrocarbons, mainly natural gas, used by the chemical industry. However, the reforming technologies currently used encounter numerous technical/scientific challenges, which depend on the quality of raw materials, the conversion efficiency and security needs for the integration of H2 production, purification and use, among others. Biogas is a high-potential versatile raw material for reforming processes, which can be used as an alternative CH4 source. The production of H2 from renewable sources, such as biogas, helps to largely reduce greenhouse gas emissions. Within this context, the integration of biogas reforming processes and the activation of fuel cell using H2 represent an important route for generating clean energy, with added high-energy efficiency. This work expounds a literature review of the biogas reforming technologies, emphasizing the types of fuel cells available, the advantages offered by each route and the main problems faced.

► Biogas has great potential for H2 generation through several reforming processes. ► Biogas purification methods can involved physicochemical and biological processes. ► In various reforming processes, biogas treated can be used as a methane source. ► H2 can be produced involving predominantly catalytic processes. ► High-temperature fuel cells are better suited for the direct use of biogas.