Mesoporous Y2Sn2O7 pyrochlore with exposed (111) facets: an active and stable catalyst for CO oxidation
| Autor: | Honggen Peng, Wenming Liu, Xiang Wang, Yang Liu, Jinshu Tian, Yunping He, Juan Xu, Jin Tan, Ning Zhang, Xianglan Xu |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
General Chemical Engineering Inorganic chemistry Pyrochlore 02 engineering and technology General Chemistry engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Hydrothermal circulation 0104 chemical sciences Catalysis law.invention Adsorption Chemical engineering law engineering Mixed oxide Calcination Thermal stability 0210 nano-technology Mesoporous material |
| Zdroj: | RSC Advances. 6:71791-71799 |
| ISSN: | 2046-2069 |
| DOI: | 10.1039/c6ra11826g |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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