Enhanced Hydrogenation Performance over Hollow Structured Co-CoOx@N-C Capsules
Hao Tian1,2,3, Xiaoyan Liu1,4, Liubing Dong3
1State Key Laboratory of Catalysis iChEM Dalian Institute of Chemical Physics Chinese Academy of Sciences 457 Zhongshan Road Dalian 116023 China.
Nonprecious metal nanocatalysts were developed using cobalt and nitrogen-doped carbon hollow capsules. These stable and highly selective catalysts are effective for producing fine chemicals like aniline via nitrobenzene hydrogenation.
Area of Science:
- Materials Science
- Catalysis
- Nanotechnology
Background:
- Developing nonprecious metal nanocatalysts is crucial for efficient fine chemical synthesis.
- Cobalt-based catalysts offer potential but often suffer from stability issues.
Purpose of the Study:
- To design highly stable and active cobalt-based nanocatalysts for fine chemical production.
- To explore the use of hollow carbon capsules for enhanced catalyst performance.
Main Methods:
- Fabrication of core-shell Zn/Co-zeolitic imidazolate frameworks (ZIF)@polymer.
- Confined pyrolysis of ZIF@polymer to create hollow Co-CoOₓ@N-C capsules.
- Optimization of catalyst properties by tuning Zn content in ZIF.
Main Results:
- Hollow Co-CoOₓ@N-C capsules effectively prevent nanoparticle sintering and agglomeration.
- Nanoporous shell facilitates efficient mass transport.
- Optimized Zn₄Co₁Oₓ@carbon hollow capsules demonstrated >99% selectivity for nitrobenzene hydrogenation to aniline.
- Catalyst exhibited excellent stability over 8 reaction cycles without deactivation.
Conclusions:
- The developed yolk-shell structured Zn₄Co₁Oₓ@carbon hollow capsules represent a highly active, selective, and stable nonprecious metal nanocatalyst.
- This approach offers a promising route for green and sustainable fine chemical production.
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