期刊
INORGANIC CHEMISTRY FRONTIERS
卷 7, 期 5, 页码 1298-1306出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0qi00073f
关键词
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资金
- National Natural Science Foundation of China [21763012, 21802056]
- Natural Science Foundation of Jiangxi Province of China [20192BAB203009]
- Innovation fund for Graduate Students of Jiangxi province [YC2019-B042]
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.
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