Article Dans Une Revue Journal of Physical Chemistry C Année : 2016

Standard and Fast Selective Catalytic Reduction of NO with NH3 on Zeolites Fe-BEA

Résumé

Two Fe-containing BEA zeolites were prepared by ion-exchange (IE; Fe-BEA) and postsynthesis (PS; Fe-BEA/DeAl) procedures. Similar Fe content (0.8 to 0.9 Fe wt%) was evidenced for studied samples. Fe-BEA, prepared by ion exchange, contained essentially iron cations at the exchange sites of the zeolite. These iron cations are either isolated or bridged through an oxygen atom (Fe-oxo cations). In Fe-BEA/DeAl, a high portion of iron was introduced in the T-positions of zeolite lattice. The other part was either at an exchange positions or deposited as oxide clusters on the outer surface of zeolite grains. For Fe-BEA, significantly higher acidity than for Fe-BEA/DeAl was evidenced by FT-IR studies with adsorption of NH3 and CO. The catalytic performance of Fe-BEA and Fe-BEA/DeAl was investigated in standard selective catalytic reduction (SCR) (NO2/NO = 0) and fast SCR (NO2/NO = 0.85). Fe-BEA revealed high catalytic activity in both SCR NOx reactions; however, production of N2O was much more apparent over this catalyst than over Fe-BEA/DeAl. In line with EPR and IR studies, the isolated or bridged-through-an-oxygen-atom extraframework iron oxo-sites in FeBEA were found to deliver higher catalytic activity than the iron oxo-sites in tetrahedral framework positions in Fe-BEA/DeAl.

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hal-01355502 , version 1 (23-08-2016)

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Magdalena Jabłońska, Gerard Delahay, Krzysztof Kruczała, Artur Błachowski, Karolina A. Tarach, et al.. Standard and Fast Selective Catalytic Reduction of NO with NH3 on Zeolites Fe-BEA. Journal of Physical Chemistry C, 2016, 120, pp.16831−16842. ⟨10.1021/acs.jpcc.6b05692⟩. ⟨hal-01355502⟩
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