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Effect of iron impurities on the catalytic activity of BEA, MOR and MFI zeolites in the SCR of NO by ethanol

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Abstract.
The combined use of chemical analysis, XRD, EPR and Mossbauer techniques provides detailed
information on the nature of iron impurities in commercial BEA, MOR and MFI zeolites. EPR and
Mo¨ ssbauer spectroscopies evidence that iron impurities are present mainly as tetrahedral Fe(III) species
and to a minor extent as octahedral Fe(III) species, with relative amounts depending on the type of
zeolite. Iron impurities present in commercial BEA, MOR and MFI zeolites are active in the selective
catalytic reduction (SCR) of NO by ethanol, with NO conversion higher than 37, 43 and 50% for BEA, MOR
and MFI, respectively, and with selectivity toward N2 higher than 90% for all zeolites in the temperature
range 575–775 K. The much higher activity of commercial BEA, MOR and MFI than that of FeSiBEA and
CoSiBEA, both prepared by a two-step postsynthesis method, suggests that Fe(III) impurities in
commercial zeolites are present in tetrahedral and/or octahedral environments, possibly close to lattice
Al, which make them active in the SCR of NO by ethanol. The Brønsted and Lewis acidic sites in studied
zeolites are determined by FTIR measurements of pyridine adsorption.

Keywords: BEA, MOR, MFI, Iron impurities, SCR of NO, XRD, EPR, Mo¨ssbauer

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Informasi Detail

Judul Seri

Applied Catalysis B: Environmental

No. Panggil

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Penerbit

London : Elsevier B.V.., 2009

Deskripsi Fisik

Applied Catalysis B: Environmental 86 (2009) 45–52

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

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