Ultrafine NiMoO x nanoparticles confined in mesoporous carbon for the reduction of nitroarenes: effect of the composition and accessibility of the active sites.
RSC Adv
; 9(8): 4571-4582, 2019 Jan 30.
Article
em En
| MEDLINE
| ID: mdl-35520158
ABSTRACT
The design of ultrafine NiMoO x nanoparticles (NPs) confined in hierarchically porous carbon remains a great challenge due to its high calcination temperature. In addition, the composition of active sites of NiMoO x NPs for the hydrogenation reaction is still ambiguous. Herein, we report a general approach for the synthesis of ultrafine NiMoO x NPs confined in mesoporous carbon with different morphologies and compositions using the replication method with SBA-15 as a hard template. The pore structure of mesoporous carbon and the Ni/Mo composition valence-state were discovered to be the main factors in the reduction of nitroarenes. The NiMoO x /mesoporous carbon-platelet (NiMoO x /MC-PL) with short mesochannels (â¼350 nm) and high surface area (â¼995 m2 g-1) possessed excellent catalytic activity towards the reduction of 4-nitrophenol, whereas NiMoO x /mesoporous carbon-hexagonal-prism (NiMoO x /MC-HP), NiMoO x /mesoporous carbon-long-rod (NiMoO x /MC-LR), and NiMoO x /mesoporous carbon-spherical (NiMoO x /MC-SP) with long mesochannels and relatively less surface area exhibited poor catalytic performance. The bifunctional mechanism or electronic synergistic effects of Ni and Mo species enhanced their catalytic performance. A good balance between MoO x and metallic Ni (NiMoO x /MC-PL-450) was found to be suitable for the reduction of 4-NP.
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01-internacional
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MEDLINE
Idioma:
En
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RSC Adv
Ano de publicação:
2019
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Article