Issue 8, 2010

Novel embedded Pd@CeO2catalysts: a way to active and stable catalysts

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

Article information

Article type
Paper
Submitted
05 Aug 2009
Accepted
16 Nov 2009
First published
23 Dec 2009

Dalton Trans., 2010,39, 2122-2127

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

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements