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Catalytic performance of Ce1-xLnxOy of nanocrystalline Ln (III-IV)-substituted ceria

Eduardo Arístides Poggio-Fraccari1, Mariño F1, Sorbello C2, Jobbagy M2

Abstract

The activity of several lanthanide promoted Ceria in CO oxidation was studied. Samples were obtained by a high yield and sustainable method by urea thermal decomposition. Precursors basic carbonates, Ce1-xLnx(OH)CO3, being Ln = La (III), Sm(III), Gd(III), Pr(III) were prepared in the range of compositions 0 to 30 at.%. These precursors were annealed to moderate temperature obtain Ln-Ce mixed oxides, at 450ºC. These exhibit large surface areas up to 120 m2/g. Their catalytic performance revealed good activity towards CO oxidation  (COOX) for all samples. However, a different behavior may be observed for Ln content higher than 20 at.%. By the reactor operation in differential conditions, the activation energy for COOX were obtained for all samples. The rise of activation energy as a function of Ln(III-IV) content is analyzed in the frame of phase stability and surface segregation.

Keywords

Ce; Lanthanides; COOX

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DOI: http://dx.doi.org/10.18063/msmr.v2i3.950
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Copyright (c) 2019 Eduardo Arístides Poggio-Fraccari1, Mariño F1, Sorbello C2, Jobbagy M2

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