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

Jinshu Tian; Honggen Peng; Xianglan Xu; Wenming Liu; Youhe Ma; Xiang Wang; Xiangjie Yang

doi:10.1039/C4CY01553C

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

Jinshu Tian,†^a Honggen Peng,†^a Xianglan Xu,^a Wenming Liu,^a Youhe Ma,^a Xiang Wang*^a and Xiangjie Yang^b

* Corresponding authors

^a College of Chemistry, Nanchang University, Nanchang, Jiangxi 330031, China
E-mail: xwang23@ncu.edu.cn
Tel: +86 15979149877

^b School of Materials Science & Engineering, Nanchang University, Nanchang, Jiangxi 330031, China

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.

Article information

https://doi.org/10.1039/C4CY01553C

Article type

Paper

Submitted

27 Nov 2014

Accepted

15 Jan 2015

First published

16 Jan 2015

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

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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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Catalysis Science & Technology

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

Abstract

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

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