ja6b06736_si_001.pdf (10.3 MB)
Catalytically Active Bimetallic Nanoparticles Supported on Porous Carbon Capsules Derived From Metal–Organic Framework Composites
journal contribution
posted on 2016-08-30, 14:25 authored by Hui Yang, Siobhan J. Bradley, Andrew Chan, Geoffrey
I. N. Waterhouse, Thomas Nann, Paul E. Kruger, Shane G. TelferWe 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.