Biogas is a valuable and renewable biofuel. However, the presence of trace contaminants such as hydrogen sulfide (0.005 � 2 v%), ammonia (<1 v%) and siloxanes (0 � 0.02%) could induce severe problems in biogas use. Thus, it is important to purify biogas and remove these harmful contaminants upstream, especially for fuel cell applications. In this paper, we have developed a series of solid adsorbents for biogas purification including H2S removal, NH3 capture and siloxane adsorption at ambient conditions. The developed metal oxide adsorbent exhibited a high H2S breakthrough capacity (~4.2 wt%) and was able to achieve extremely low level of sulfur (below 10 ppbv). The NH3-MBS had not only high capacity, but also good regenerability and stability for ammonia capture. The primary adsorbents screening experiments showed that the commercial silica gel had a better performance in siloxane adsorption. With the combination of these adsorbents, the biogas purification process could be designed.

Development of solid adsorbents for biogas purification

244th National Meeting (2012)

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