Wang Jiajia, Xu Haitao, Ao Chengcheng, Pan Xinbo, Luo Xikuo, Wei ShengJie, Li Zhi, Zhang Lidong, Xu Zhen-Liang, Li Yadong
School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China.
School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China.
iScience. 2020 Jun 26;23(6):101233. doi: 10.1016/j.isci.2020.101233. Epub 2020 Jun 4.
Designing nanocatalysts with synergetic functional component is a desirable strategy to achieve both high activity and selectivity for industrially important hydrogenation reaction. Herein, we fabricated a core-shell hollow Au@Pt NTs@ZIFs (ZIF, zeolitic imidazolate framework; NT, nanotube) nanocomposite as highly efficient catalysts for semi-hydrogenation of acetylene. Hollow Au@Pt NTs were synthesized by epitaxial growth of Pt shell on Au nanorods followed with oxidative etching of Au@Pt nanorod. The obtained hollow Au@Pt NTs were then homogeneously encapsulated within ZIFs through in situ crystallization. By combining the high activity of bimetallic nanotube and gas enrichment property of porous metal-organic frameworks, hollow Au@Pt NT@ZIF catalyst was demonstrated to show superior catalytic performance for the semi-hydrogenation of acetylene, in terms of both selectivity and activity, over those of monometallic Au and solid bimetal nanorod@ZIF counterparts. This catalysts design idea is believed to be inspirable for the development of highly efficient nanocomposite catalysts.
设计具有协同功能组分的纳米催化剂是实现工业上重要的加氢反应的高活性和高选择性的理想策略。在此，我们制备了一种核壳空心Au@Pt NTs@ZIFs（ZIF，沸石咪唑酯骨架；NT，纳米管）纳米复合材料作为乙炔半加氢的高效催化剂。通过在金纳米棒上外延生长铂壳，随后对Au@Pt纳米棒进行氧化蚀刻来合成空心Au@Pt NTs。然后通过原位结晶将所得的空心Au@Pt NTs均匀地封装在ZIFs中。通过结合双金属纳米管的高活性和多孔金属有机骨架的气体富集特性，空心Au@Pt NT@ZIF催化剂在乙炔半加氢反应中，在选择性和活性方面均表现出优于单金属Au和固体双金属纳米棒@ZIF对应物的催化性能。这种催化剂设计理念被认为对高效纳米复合催化剂的开发具有启发性。
