e-journal

Effect of extra-framework gallium on the structure of iron species in Fe/ZSM-5

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Abstract.
A series of Fe/Ga-ZSM-5 catalysts with different Ga contents were prepared by solid-state ion exchange
method. Ultraviolet and visible Raman spectroscopy, ultraviolet–visible diffuse reflectance spectroscopy,
H2-temperature-programmed reduction, and N2O decomposition at 523 K were used to investigate the
effect of extra-framework Ga on the nature of the Fe species in Fe/Ga-ZSM-5 catalysts. Introducing
extra-framework Ga and high-temperature treatment can significantly affect the distribution even the
nature of the Fe species in Fe/Ga-ZSM-5. For the high-temperature treated catalysts, the presence of
extra-framework Ga remarkably increases the amount of the Fe(II) sites and the activity of direct N2O
decomposition, suggesting that extra-framework Ga can promote the formation of the active sites for
N2O decomposition. The possible interpretation of the beneficial role of extra-framework Ga is that extraframework Ga facilitates the reduction of bi- and oligo-nuclear Fe(III) sites to form the Fe(II) sites and interacts with the Fe sites with low nuclearity to form a mixed Fe–Ga–O phase for the high-temperature
treated catalysts.

Keywords:
Raman spectroscopy
N2O decomposition
Transient response
Extra-framework Ga
Isolated
Bi-nuclear
Oligo-nuclear

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Informasi Detail

Judul Seri

Journal of Catalysis

No. Panggil

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Penerbit

London : Elsevier Inc.., 2008

Deskripsi Fisik

Journal of Catalysis 259 (2008) 269–275

Bahasa

English

ISBN/ISSN

00219517

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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