Issue 75, 2016

Mesoporous Y2Sn2O7 pyrochlore with exposed (111) facets: an active and stable catalyst for CO oxidation

Abstract

Pyrochlore with an A2B2O7 crystal structure is a perfect mixed oxide for catalytic application for its high thermal stability. In the present manuscript, mesoporous Y2Sn2O7 pyrochlore with exposed (111) facets was successfully synthesized via a simple hydrothermal method and used for CO oxidation. In comparison with Y2Sn2O7 prepared by a co-precipitation method (Y2Sn2O7-CP), Y2Sn2O7 prepared by a hydrothermal method (Y2Sn2O7-HT) showed superior catalytic performance for CO oxidation. Even after calcination at 800 °C for 4 h (Y2Sn2O7-HT-800), its catalytic performance was still better than that of Y2Sn2O7-CP. Y2Sn2O7-HT is also a good support for Pd nanoparticles. Pd/Y2Sn2O7-HT demonstrates the best performance for CO oxidation among all the catalysts. All the samples were characterized by XRD, SEM, TEM, HAADF-STEM Mapping, N2 adsorption/desorption, H2-TPR, CO-TPD and Raman spectra to reveal their physicochemical properties. Compared with Y2Sn2O7-CP, Y2Sn2O7-HT has more exposed (111) facets, possesses a higher amount of active surface oxygen species and had high mesoporous surface areas, which should be the reasons accounting for the superior CO oxidation performance of Y2Sn2O7-HT and Pd/Y2Sn2O7-HT. Pd/Y2Sn2O7-HT also shows superior water-tolerance. In wet feed, its catalytic activity was even better than that in dry feed. Therefore, Pd/Y2Sn2O7-HT may be a potential catalyst for practical vehicle emission control.

Graphical abstract: Mesoporous Y2Sn2O7 pyrochlore with exposed (111) facets: an active and stable catalyst for CO oxidation

Article information

Article type
Paper
Submitted
06 May 2016
Accepted
18 Jul 2016
First published
22 Jul 2016

RSC Adv., 2016,6, 71791-71799

Mesoporous Y2Sn2O7 pyrochlore with exposed (111) facets: an active and stable catalyst for CO oxidation

H. Peng, J. Xu, J. Tian, Y. Liu, Y. He, J. Tan, X. Xu, W. Liu, N. Zhang and X. Wang, RSC Adv., 2016, 6, 71791 DOI: 10.1039/C6RA11826G

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