Catalytic NH3 decomposition with limonite rich in α-FeOOH has been studied as a hot gas cleanup method to remove a low concentration of NH3 from fuel gas produced in coal gasification. Fine particles of metallic Fe formed from α-FeOOH achieve the almost complete decomposition of 2000 ppm NH3 to N2 at 500°C under a high space velocity of 45,000 h−1 and show the stable catalytic performance for 50 h. The predominant catalytic mechanism involving the formation and subsequent decomposition of Fe nitrides may be proposed on the basis of the XRD and TPD results.
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Tsubouchi, N., Hashimoto, H. & Ohtsuka, Y. High Catalytic Performance of Fine Particles of Metallic Iron Formed from Limonite in the Decomposition of a Low Concentration of Ammonia. Catal Lett 105, 203–208 (2005). https://doi.org/10.1007/s10562-005-8691-8
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DOI: https://doi.org/10.1007/s10562-005-8691-8