The ability of H2S to reduce NO in a fixed bed reactor using a γ-alumina catalyst was studied with the objective of generating new methods for conversion of NO to N2. Compared to the homogenous reaction of NO with H2S, the catalyzed reaction showed improved conversions of NO to N2. Using a gas space velocity of 1000 h−1 and a feed of 1% NO and 1% H2S in argon, it was found that the conversion of NO to N2 was complete at 800 °C. This result compared to a 38% conversion of NO to N2 for the homogeneous gas phase reaction at 800 °C. At temperatures below 800 °C, a short fall in the nitrogen balance was discovered when the γ-alumina was employed as a catalyst. This discrepancy was explained by conversion of NO to NH3 and subsequent reaction of the NH3 with any SO2 in the system to form ammonium sulfur oxy-anion salts. This suggestion is supported by the finding that when larger amounts of H2S were used relative to NO, more NH3 was formed together in tandem with lower N2 mass balances. Several reaction pathways have been proposed for the catalytic reduction of NO by H2S.
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Clark, P.D., Nielsen, A.D. & Dowling, N.I. Catalytic Reduction of Nitric Oxide by Hydrogen Sulfide Over γ-alumina. Catal Lett 104, 73–78 (2005). https://doi.org/10.1007/s10562-005-7439-9
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DOI: https://doi.org/10.1007/s10562-005-7439-9