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Ultrafine Rh nanoparticles confined by nitrogen-rich covalent organic frameworks for methanolysis of ammonia borane

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Abstract

Nitrogen-rich covalent organic frameworks (COFs) with a high content of nitrogen and an inherent porous skeleton are considered as a remarkable support for encapsulating active metal nanoparticles (MNPs). Herein, a cost-effective and nitrogen-rich COF (PC-COF) synthesized from piperazine and cyanuric chloride was used as a carrier for encapsulating Rh NPs via a metal–nitrogen (M–N) coordination reduction strategy. Numerous precisely tailored N atoms within the PC-COF facilitate the construction of Rh–N complexes between Rh ions and N atoms, which can be in situ reduced to produce ultrafine Rh NPs confined in the pores of the PC-COF. The optimized Rh/PC-COF catalyst shows uniform dispersibility and a fairly narrow distribution (1.4–2.6 nm) of Rh NPs, giving an ultrahigh catalytic activity for the methanolysis of ammonia borane (AB) with a total turnover frequency (TOF) of 505 min−1 at 298 K. The excellent catalytic performances can be ascribed to the ultrafine particle size, electronic-rich Rh NPs, and the synergistic effect of the Rh NPs and PC-COF. The M–N coordination reduction strategy for encapsulating ultrafine MNPs into the pores of COFs opens a valuable pathway for developing metal nanocatalysts with high catalytic performance and excellent stability.

Graphical abstract: Ultrafine Rh nanoparticles confined by nitrogen-rich covalent organic frameworks for methanolysis of ammonia borane

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Supplementary files

Article information


Submitted
18 Jan 2020
Accepted
06 Feb 2020
First published
07 Feb 2020

Inorg. Chem. Front., 2020, Advance Article
Article type
Research Article

Ultrafine Rh nanoparticles confined by nitrogen-rich covalent organic frameworks for methanolysis of ammonia borane

X. Li, C. Zhang, M. Luo, Q. Yao and Z. Lu, Inorg. Chem. Front., 2020, Advance Article , DOI: 10.1039/D0QI00073F

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