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Nature and Reactivity of the Active Species Formed After NO Adsorption and NO + O2 Coadsorption on an Fe-Containing Zeolite

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Abstract

Reactivity of the NO adspecies on Fe-ZSM-11 was studied by FTIR in situ. The effect of Fe content and the oxidation state of Fe in the samples were correlated with the catalytic activity. The relation between the adsorbed species, the Brønsted sites and catalytic activity in the SCR of NOx to N2 was also investigated. Moreover, FTIR allowed us to identify the active sites and the adsorption complexes present in FeMFI. Samples prepared by the sol–gel method with different Fe content displaying vastly different activity and selectivity in the reduction of NO to N2 with isobutane in excess of O2. Thus, in contact with pure nitric oxide, NO ions, mononitrosyl groups, nitro groups and nitrate ions have been identified. Fen+ active sites are the most probable centers for NO oxidation to NO2 and its further conversion to adsorbed nitro groups and nitrate ions, steps that are crucial for NO reduction. The concerted action of Fen+ and H+ sites of the catalysts over the NO conversion to N2 and isobutane conversion was analyzed.

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Authors and Affiliations

  1. Grupo Fisicoquímica de Nuevos Materiales /Centro de Investigación y Tecnología Química (CITeQ), Universidad Tecnológica Nacional, Facultad Regional Córdoba, Maestro Lopez esq. Cruz Roja, s/n, 5016, Córdoba, Argentina

    Andrea R. Beltramone & Oscar A. Anunziata

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  1. Andrea R. Beltramone
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  2. Oscar A. Anunziata
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Correspondence to Oscar A. Anunziata.

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Beltramone, A.R., Anunziata, O.A. Nature and Reactivity of the Active Species Formed After NO Adsorption and NO + O2 Coadsorption on an Fe-Containing Zeolite. Catalysis Letters 92, 131–140 (2004). https://doi.org/10.1023/B:CATL.0000014335.11364.30

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