NDLI: Ce0.9Fe0.1O1.97/Ag: a cheaper inverse catalyst with excellent oxygen storage capacity and improved activity towards CO oxidation

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Ce_0.9Fe_0.1O_1.97/Ag: a cheaper inverse catalyst with excellent oxygen storage capacity and improved activity towards CO oxidation

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Catalysis Science & Technology Vol -3

Catalysis Science & Technology Vol -2

Catalysis Science & Technology Vol -1

Ce_0.9Fe_0.1O_1.97/Ag: a cheaper inverse catalyst with excellent oxygen storage capacity and improved activity towards CO oxidation

Content Provider	Royal Society of Chemistry (RSC)
Author	Huang, Xinsong Li, Liping Li, Guangshe Zuo, Ying
Copyright Year	2014
Abstract	Noble-metal-supported metal oxides (e.g., Au/CeO2, Pd/Al2O3, etc.) are popular as efficient catalysts for many important catalytic reactions, while their high price and easy deactivation restrict their broad application. Herein, we initiate a double substitution methodology to acquire catalysts with merits of excellent catalytic activity, high stability, and relatively low cost. For this purpose, a Au/CeO2 catalyst was used as reference, and the noble metal Au was completely replaced by the cheaper Ag, meanwhile the rare earth ion, Ce4+ of the CeO2 support was partially substituted by the transition metal ion, Fe3+. This inversely supported catalyst, Ce0.9Fe0.1O1.97/Ag, was prepared by a two-step method based on co-precipitation and a subsequent liquid-phase reduction. Systematic characterizations demonstrate that Ag nanoparticles with a diameter of around 50 nm were wrapped by Ce0.9Fe0.1O1.97 layers. Between the Ag nanoparticles and Ce0.9Fe0.1O1.97 layer, there existed a strong interaction. When this sample was tested as a catalyst for CO oxidation, a full conversion temperature of 150 °C was achieved at a space velocity of 24 000 ml h−1 g−1cat, showing a catalytic activity comparable to that previously reported in the literature on the known catalyst Au@CeO2 measured at a lower space velocity of 15 000 ml h−1 g−1cat. More strikingly, this catalyst showed a superb catalytic stability and enhanced oxygen storage capacity. The introduction of smaller Fe3+ into the CeO2 lattice and the strong interactions between Ag and Ce0.9Fe0.1O1.97 strongly improved the stability and catalytic performance.
Starting Page	402
Ending Page	410
Page Count	9
File Format	HTM / HTML PDF
ISSN	20444753
Volume Number	4
Issue Number	2
Journal	Catalysis Science & Technology
DOI	10.1039/c3cy00722g
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Oxygen storage Noble metal Ion Strong interaction Transition metal Stellar kinematics Coprecipitation Catalyst support Crystal structure
Content Type	Text
Resource Type	Article
Subject	Catalysis

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