期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 8, 页码 9966-9976出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b21077
关键词
mesoporous materials; nanoreactors; heteroaggregates; nitroaromatics; selective hydrogenation
资金
- National Natural Science Foundation of China [21571183, 21878078, 21902169]
- Innovation Team Foundation from the Ningbo Science and Technology Bureau [2016B10005]
- Zhejiang Innovation center of Application Technology Collaboration [NZXT2018206]
Nanosized Ir catalysts suffer from serious side reactions and poor stability during hydrogenation of substituted nitroaromatics to produce aromatic amines. In this work, core-shell nanostructures with sub-4 nm Ir-CoOx hybrid cores and mesoporous SiO2 shells were designed and prepared to overcome these problems. The Ir-CoOx hybrid cores were converted from IrCo alloy nanoparticles (NPs) inside SiO2 through in situ calcination and reduction pretreatments. The SiO2 mesoporous shells in Ir-CoOx@SiO2 nanoreactors prevented the agglomeration/sintering of IrCo NPs, while allowing the free reactants and products (big molecules). The synergy between Ir and CoOx species improved H-2 adsorption, thus affecting the reaction rate as well as the selectivity to aromatic amines. As a result, the obtained Ir-CoOx@SiO2 nanocatalyst showed tremendous improvement in catalytic activity, selectivity, and stability.
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