e-journal

Highly active and stable bimetallic Ir/Fe-USY catalysts for direct and NO-assisted N2O decomposition

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Abstract.
The current research investigated N2O decompositions over the catalysts Ir/Fe-USY, Fe-USY and Ir-USY
under various conditions, and found that a trace amount of iridium (0.1 wt%) incorporated into Fe-USY
significantly enhanced N2O decomposition activity. The decomposition of N2O over this catalyst (Ir/Fe-
USY-0.1%) was also partly assisted by NO present in the gas mixture, in contrast to the negative effect of
NO over noble metal catalysts. Moreover, Ir/Fe-USY-0.1% can decomposemore than 90% at 400 oC (i.e. the
normal exhaust temperature) under simulated conditions of a typical nitric acid plant, e.g. 5000 ppm
N2O, 5% O2, 700 ppm NO and 2% H2O in balance He, and such an activity can be kept for over 110 h under
these strict conditions. The excellent properties of bimetallic Ir/Fe-USY-0.1% catalyst are presumably
related to the good dispersion of Fe and Ir on the zeolite framework, the formation of framework Al–O–Fe
species and the electronic synergy between the Ir and Fe sites. The reaction mechanism for N2O
decomposition has been further discussed on the temperature-programmed desorption profiles of O2, N2
and NO2.

Keywords: Bimetallic catalyst, Ir/Fe-USY, Synergy, NO-assisted N2O decomposition, Durability

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Informasi Detail

Judul Seri

Applied Catalysis B: Environmental

No. Panggil

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Penerbit

London : Elsevier B.V.., 2008

Deskripsi Fisik

Applied Catalysis B: Environmental 84 (2008) 734–741

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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