Fabrication of Magnetic Pd/MOF Hollow Nanospheres with Double-Shell Structure: Toward Highly Efficient and Recyclable Nanocatalysts for Hydrogenation Reaction
| Autor: | Chong Ma, Shuhua Wang, Ning Zhang, Shunli Shi, Mingming Wan, Yicheng Zhong, Yuelin Mao, Dan Zhao, Chao Chen |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Heterogeneous catalysis 01 natural sciences Nanomaterial-based catalyst 0104 chemical sciences Catalysis Styrene chemistry.chemical_compound chemistry Chemical engineering Void (composites) General Materials Science Leaching (metallurgy) 0210 nano-technology Superparamagnetism Reusability |
| Zdroj: | ACS Applied Materials & Interfaces. 11:32251-32260 |
| ISSN: | 1944-8252 1944-8244 |
| DOI: | 10.1021/acsami.9b07864 |
| Popis: | MNPs@MOF catalysts obtained by encapsulating metal nanoparticles (NPs) into metal-organic frameworks (MOFs) show fascinating performance in heterogeneous catalysis. The improvement of catalytic activity and reusability of MNPs@MOF catalysts has been a great challenge for a long time. Herein, we demonstrate well-designed Pd/MOFs, featuring hollow double-shell structure and magnetic property, exhibiting high reusability, efficient catalytic activity, and size selectivity for hydrogenation reaction. The as-synthesized Pd/MOF, denoted as Void nFe3O4@Pd/ZIF-8@ZIF-8, possesses diverse functional structural features. The hollow cavity can improve mass transfer; superparamagnetic Fe3O4 NPs embedded in the inner MOF shell can enhance the separation and recyclability; Pd NPs are highly dispersed in the matrix of the inner MOF shell, and the outer MOF shell acts as a protector to prevent the leaching of Pd NPs and a sieve to achieve size selectivity. As a proof of concept, the Void nFe3O4@Pd/ZIF-8@ZIF-8 catalyst exhibited excellent performance for the hydrogenation of styrene at room temperature. The activity only reduced 10% after 20 cycles for the higher conversions (>90%), and the lower conversion only decreased 3.6% (from 32.5 to 28.9% conversion) after twenty consecutive cycles, indicating the good and intrinsic reusability of the catalyst. The proposed structure in this work provides a strategy to effectively improve the reusability of MNPs@MOF catalysts, which would increase their practical applications. |
| Databáze: | OpenAIRE |
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