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Issue 8, 2010
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Novel embedded Pd@CeO2 catalysts: a way to active and stable catalysts

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Abstract

1-wt% Pd-CeO2 catalysts were prepared by co-precipitation of Pd nanoparticles with ceria (Pd@CeO2-CP), by a microemulsion procedure (Pd@CeO2-ME), and by normal impregnation of Pd salts (Pd/CeO2-IMP) in order to test the concept that Pd-CeO2 catalysts could be more stable for the water-gas-shift (WGS) reaction when the Pd is embedded in CeO2. Initial WGS rates measured at 250 °C were similar for the Pd@CeO2-CP and Pd/CeO2-IMP, indicating that Pd was accessible for gas-phase reactions on both catalysts. Pd@CeO2-CP exhibited better stability for WGS than did Pd/CeO2-IMP but exposure to the WGS environment at 400 °C still caused a decrease in activity. Physical characterization of the Pd@CeO2-ME implied that the core-shell nanoparticles underwent condensation that resulted in a low surface area and poor Pd accessibility. However, the Pd@CeO2-ME sample exhibited good stability for WGS, suggesting that more effective encapsulation of Pd can limit the sintering of the metal phase, thus resulting in stable catalysts under high temperature reaction conditions.

Graphical abstract: Novel embedded Pd@CeO2 catalysts: a way to active and stable catalysts

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Publication details

The article was received on 05 Aug 2009, accepted on 16 Nov 2009 and first published on 23 Dec 2009


Article type: Paper
DOI: 10.1039/B916035C
Citation: Dalton Trans., 2010,39, 2122-2127
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    Novel embedded Pd@CeO2 catalysts: a way to active and stable catalysts

    M. Cargnello, T. Montini, S. Polizzi, N. L. Wieder, R. J. Gorte, M. Graziani and P. Fornasiero, Dalton Trans., 2010, 39, 2122
    DOI: 10.1039/B916035C

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