Selective oxidation of ammonia to nitrogen on transition metal containing mixed metal oxides |
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Authors: | Lucjan Chmielarz, Piotr Ku trowski, Alicja Rafalska- asocha,Roman Dziembaj |
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Affiliation: | Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Kraków, Poland |
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Abstract: | The selective catalytic oxidation of ammonia to nitrogen (NH3-SCO) has been studied over hydrotalcite derived mixed metal oxides containing Cu, Co, Fe or Ni. XRD, BET, NH3-TPD and TPR techniques were used for catalysts characterization. Results of NH3-SCO were compared with those of selective catalytic reduction of NO with NH3 (NO-SCR). Reaction mechanism was studied by temperature-programmed surface reaction (TPSR) and activity tests with a various contact time. Catalytic performance of the studied samples depends on both kind and loading of transition metals in the mixed metal oxide system. The Cu-containing samples have been found to be the most active catalysts of the NH3-SCO process. Transition metal loading strongly influences distribution of ammonia oxidation products. The highest selectivity to N2 was measured for the catalysts with the lowest transition metal content. |
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Keywords: | Hydrotalcite derived mixed metal oxides Transition metals Selective oxidation of NH3 |
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