Issue 4, 2015

High surface area La2Sn2O7 pyrochlore as a novel, active and stable support for Pd for CO oxidation

Abstract

A high surface area mesoporous La2Sn2O7 compound with a well crystallized pyrochlore structure has been successfully prepared by a simple low temperature hydrothermal (La2Sn2O7-HT) method. As a support for Pd, a catalyst with a significantly higher activity for CO oxidation has been achieved in comparison with the other two non-mesoporous pyrochlores prepared by co-precipitation (La2Sn2O7-CP) and sol–gel (La2Sn2O7-SG) methods. The CO adsorption–desorption and STEM results demonstrate that on Pd/La2Sn2O7-HT, the highest Pd dispersion can be achieved among all of the catalysts. Moreover, compared with Pd/La2Sn2O7-CP and Pd/La2Sn2O7-SG, more active oxygen species were formed on Pd/La2Sn2O7-HT. It is believed that these are the two major reasons accounting for the superior CO oxidation activity of Pd/La2Sn2O7-HT. Furthermore, this catalyst also shows a stable reaction performance in the presence of water vapour. In conclusion, the mesoporous La2Sn2O7-HT pyrochlore is an excellent support for Pd, and has the potential to be applied in some real exhaust control processes.

Graphical abstract: High surface area La2Sn2O7 pyrochlore as a novel, active and stable support for Pd for CO oxidation

Article information

Article type
Paper
Submitted
27 Nov 2014
Accepted
15 Jan 2015
First published
16 Jan 2015

Catal. Sci. Technol., 2015,5, 2270-2281

High surface area La2Sn2O7 pyrochlore as a novel, active and stable support for Pd for CO oxidation

J. Tian, H. Peng, X. Xu, W. Liu, Y. Ma, X. Wang and X. Yang, Catal. Sci. Technol., 2015, 5, 2270 DOI: 10.1039/C4CY01553C

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