MacDiarmid Institute for Advanced Materials and Nanotechnology, Institute of Fundamental Sciences, Massey University , Palmerston North 4442, New Zealand.
MacDiarmid Institute for Advanced Materials and Nanotechnology, School of Chemical and Physical Sciences, Victoria University of Wellington , Wellington 6140, New Zealand.
J Am Chem Soc. 2016 Sep 14;138(36):11872-81. doi: 10.1021/jacs.6b06736. Epub 2016 Aug 30.
We report a new methodology for producing monometallic or bimetallic nanoparticles confined within hollow nitrogen-doped porous carbon capsules. The capsules are derived from metal-organic framework (MOF) crystals that are coated with a shell of a secondary material comprising either a metal-tannic acid coordination polymer or a resorcinol-formaldehyde polymer. Platinum nanoparticles are optionally sandwiched between the MOF core and the shell. Pyrolysis of the MOF-shell composites produces hollow capsules of porous nitrogen-doped carbon that bear either monometallic (Pt, Co, and Ni) or alloyed (PtCo and PtNi) metal nanoparticles. The Co and Ni components of the bimetallic nanoparticles are derived from the shell surrounding the MOF crystals. The hollow capsules prevent sintering and detachment of the nanoparticles, and their porous walls allow for efficient mass transport. Alloyed PtCo nanoparticles embedded in the capsule walls are highly active, selective, and recyclable catalysts for the hydrogenation of nitroarenes to anilines.
我们报告了一种新的方法，用于制备单金属或双金属纳米粒子，这些纳米粒子被限制在中空氮掺杂多孔碳胶囊内。这些胶囊是由金属有机骨架（MOF）晶体衍生而来的，这些晶体被一层由金属-鞣酸配合物或间苯二酚-甲醛聚合物组成的二次材料包裹。铂纳米粒子可以选择夹在 MOF 核和壳之间。MOF-壳复合材料的热解产生了具有中空多孔氮掺杂碳壳的胶囊，这些胶囊含有单金属（Pt、Co 和 Ni）或合金（PtCo 和 PtNi）金属纳米粒子。双金属纳米粒子的 Co 和 Ni 组分来自 MOF 晶体周围的壳。空心胶囊可防止纳米粒子的烧结和脱落，其多孔壁允许高效的质量传输。嵌入胶囊壁中的合金 PtCo 纳米粒子是用于将硝基芳烃氢化生成苯胺的高活性、选择性和可回收的催化剂。
