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Efficient oxygen storage property of Sr–Fe mixed oxide as automotive catalyst support

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Abstract

The efficiency of catalytic systems for the removal of nitrogen oxides (NOx) from automotive exhaust gases is strongly affected by the oxygen concentration in the exhaust gas. To overcome this problem, an oxygen storage material has been used in the purification systems. This study demonstrates the NO reduction under various oxygen concentrations over Pd/Sr3Fe2O7−δ catalysts in which Fe is partially replaced by other transition metals (Mn, Co, Ni, and Cu). Pd/Sr3(Fe0.8Ni0.2)2O7−δ with a layered perovskite structure showed the highest NO reduction activity among the examined catalysts under a wide range of oxygen concentrations. Ni3+ was found to replace Fe3+ rather than Fe4+ in Sr3Fe2O7−δ. Pd/Sr3(Fe0.8Ni0.2)2O7−δ showed significantly improved oxygen storage capacity as compared to Pd/Sr3Fe2O7−δ, which was attributed to the redox between Ni3+ and Ni2+ accompanying the Fe4+/Fe3+ redox reaction during oxygen release/storage processes. This study provides useful information for the design of novel catalysts with a perovskite-type structure.

Graphical abstract: Efficient oxygen storage property of Sr–Fe mixed oxide as automotive catalyst support

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Publication details

The article was received on 29 Aug 2018, accepted on 07 Nov 2018 and first published on 08 Nov 2018


Article type: Paper
DOI: 10.1039/C8TA08378A
Citation: J. Mater. Chem. A, 2019, Advance Article
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    Efficient oxygen storage property of Sr–Fe mixed oxide as automotive catalyst support

    K. Beppu, S. Hosokawa, H. Asakura, K. Teramura and T. Tanaka, J. Mater. Chem. A, 2019, Advance Article , DOI: 10.1039/C8TA08378A

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