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Issue 23, 2018
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Crystal plane dependent dopant migration that boosts catalytic oxidation

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Abstract

CeO2 rods with {110} facets and cubes with {100} facets were utilized as catalyst supports to probe the effect of crystallographic facets on the iron species and the structure-dependent catalytic performance. In this approach, Fe-doped ceria nanorods and nanocubes with dominantly exposed {110} and {100} crystal planes were respectively prepared and were subjected to pretreatments either in a N2 or O2 atmosphere. We find that Fe-doped nanocubes exhibit much better CO oxidation performance after calcination in O2 than in N2, even better than nanorods, which is unusual. This interesting observation is because Fe atoms migrate more efficiently to the {100} crystal surfaces, giving rise to a Fe3+-rich surface, when Fe-doped catalysts are sintered in O2, which consequently results in an increase of adsorbed surface oxygen species on nanocubes. Various analysis strategies (TEM, STEM, XRD, N2-physisorption, H2-TPR, XPS and Raman) reveal that the crystallographic facets have a strong effect on the iron species, and finally support our hypothesis.

Graphical abstract: Crystal plane dependent dopant migration that boosts catalytic oxidation

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Publication details

The article was received on 26 Jul 2018, accepted on 21 Oct 2018 and first published on 22 Oct 2018


Article type: Paper
DOI: 10.1039/C8CY01535J
Citation: Catal. Sci. Technol., 2018,8, 6084-6090
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    Crystal plane dependent dopant migration that boosts catalytic oxidation

    R. Wang, J. Wei, H. Wei and Y. Yang, Catal. Sci. Technol., 2018, 8, 6084
    DOI: 10.1039/C8CY01535J

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