Fabrication of Ir-CoO@mesoporous SiO2 Nanoreactors for Selective Hydrogenation of Substituted Nitroaromatics
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Updated: Dec 29, 2025

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production
Published on: December 6, 2021
Shujian Wang1, Chunzheng Wu1, Hongbo Yu1
1Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences , 1219 Zhongguan West Road , Ningbo , Zhejiang 315201 , P. R. China.
Abstract:
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-CoO hybrid cores and mesoporous SiO2 shells were designed and prepared to overcome these problems. The Ir-CoO hybrid cores were converted from IrCo alloy nanoparticles (NPs) inside SiO2 through in situ calcination and reduction pretreatments. The SiO2 mesoporous shells in Ir-CoO@SiO2 nanoreactors prevented the agglomeration/sintering of IrCo NPs, while allowing the free reactants and products (big molecules). The synergy between Ir and CoO species improved H2 adsorption, thus affecting the reaction rate as well as the selectivity to aromatic amines. As a result, the obtained Ir-CoO@SiO2 nanocatalyst showed tremendous improvement in catalytic activity, selectivity, and stability.
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