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Modification of CeO2–ZrO2 mixed oxides by coprecipitated/impregnated Sr: Effect on the microstructure and oxygen storage capacity

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Abstract.
Strontium was introduced to modify CeO2–ZrO2 mixed oxides (CZ) by two methods, coprecipitation
(CZS) and impregnation (SCZ). Structural and textural characterizations revealed that Sr could retard
the sintering of oxide particles and restrict the phase segregation during the hydrothermal ageing
treatment. Specifically, the impregnation method brought about a more satisfying thermal stability of
the modified CZ. This phenomenon was attributed to the enrichment of Sr on the particle surface and
the formation of SrZrO3 phase. The reducibility of the oxides was investigated by means of the oxygen
storage capacity (OSC), and aged SCZ (SCZa) presented the best OSC performance. The reduction-ratiodependent
activation energy (Ea) was extremely low for the surface reduction of SCZa, suggesting the
participation of highly active oxygen. The SrZrO3/CeO2–ZrO2 interface was considered as the possible
origin of this oxygen species. During bulk reduction, the effect of Sr on enhancing the reducibility was
evident as well.

Keywords:
CeO2–ZrO2 mixed oxides
Strontium
Impregnation
OSC
Interface

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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 258 (2008) 177–186

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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