Biogas consisting mainly of methane (CH4) and carbon dioxide (CO2) from anaerobic digestion and landfills, is a valuable and renewable biorael that could have a significant impact on future energy scenarios (1-3). Trace contaminants such as hydrogen sulfide (H2S, 0.005 - 2 v%), ammonia (NH3, <1 v%) and siloxanes (0 -0.02%) are often present in biogas (4). Although their existences and quantities largely depend on the source of biogas production, these trace contaminants could induce severe problems in biogas use because 1) they are detrimental to any biogas conversion devices (e.g., corrosion, erosion, fouling) and 2) they generate harmful environmental emissions. Therefore, it is important to purify biogas and remove these harmful contaminants upstream before it enters its end use processes/devices, especially for fuel cell applications.
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