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In situ FT-IR investigation of the reduction of NO with CO over Au/CeO2-Al2O3 catalyst in the presence and absence of H2

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Abstract.
The NO + CO + H2 reaction over CeO2, Au/CeO2 (3 wt% Au), Au/CeO2-Al2O3 (2.9 wt% Au, 20 wt% Al2O3) and
CeO2-Al2O3 mixed support prepared by co-precipitation has been studied by FT-IR spectroscopy at
elevated temperatures. Formation of NCO species has been detected on all of the samples. The presence of
metallic gold is not necessary for the generation of the isocyanates on ceria and themixed ceria-alumina
support. The NCO species are produced by a process involving the dissociation of NO on the oxygen
vacancies of the support, followed by the reaction between N atoms lying on the surface and CO
molecules. Gold plays an important role in the modification of ceria leading to Ce3+ and oxygen vacancies
formation, and causes significant lowering of the reduction temperature of CeO2 and CeO2-Al2O3
enhancing the reducibility of ceria surface layers. The role of H2 is to keep the surface reduced during the
course of the reaction. The onset temperature, at which the interaction between the surface isocyanates
and NO begins, is low (100 oC). This explains the high activity of the Au/CeO2-Al2O3 catalyst with 100%
selectivity in the reduction of NO by CO at low temperature (200 oC) and in the presence of H2.

Keywords: Ceria, Ceria-alumina, Supported gold, NO reduction by CO, Mechanism, In situ FT-IR spectroscopy

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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 88 (2009) 113–126

Bahasa

English

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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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