Triple-shelled CuO/CeO2 hollow nanospheres derived from metal–organic frameworks as highly efficient catalysts for CO oxidation
| Autor: | Nan Zhang, Xue-Zhi Song, Zhenquan Tan, Yu-Lan Meng, Sihang Liu, Shao-Jie Li, Xi Chen, Qiao-Feng Su |
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| Rok vydání: | 2019 |
| Předmět: |
Surface oxygen
Chemistry 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Catalysis Nanomaterial-based catalyst 0104 chemical sciences Chemical engineering Materials Chemistry Lattice oxygen Metal-organic framework 0210 nano-technology Porosity Cyclic stability |
| Zdroj: | New Journal of Chemistry. 43:16096-16102 |
| ISSN: | 1369-9261 1144-0546 |
| DOI: | 10.1039/c9nj04244j |
| Popis: | Developing advanced nanocatalysts with superior structural and textural characteristics can provide significant potential for CO oxidation. Herein, triple-shelled CuO/CeO2 hollow nanospherical catalysts have been successfully prepared through a metal–organic framework (MOF) engaged strategy, involving two steps: thermal annealing of CeMOF precursors and subsequent deposition–precipitation of CuO. By tuning the loading of CuO species, the composites show a typical volcano-shaped relationship between the composition and the catalytic activity. CuO/CeO2-8% is the most active catalyst with the lowest temperature (130 °C) to achieve complete CO conversion, and it possesses the maximum turnover frequency (TOF) value of 1.72 × 10−3 s−1 at 90 °C. Systematic structural characterization revealed that the remarkably improved catalytic performance can be attributed to a unique porous triple-shelled structure, abundant surface oxygen vacancies, greater Cu+ content, more lattice oxygen and the synergistic effect between two individual components. Furthermore, the superior catalyst also has good cyclic stability. Of significance, this work may open a novel, facile avenue for fabricating desirable multicomponent nanocatalysts from proper MOFs for pollution control and environment protection. |
| Databáze: | OpenAIRE |
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