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Sánchez-Férez F, Calvet T, Font-Bardia M, Pons J. Cu(II) coordination polymers with 4,4′-bipyridine. Synthesis and crystal structures. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2021.130219] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Two Co(II) complexes based on 6-(3-pyridyl)isophthalic acid ligand: Structures, stability and catalytic applications. Polyhedron 2018. [DOI: 10.1016/j.poly.2018.02.014] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Four unprecedented cobalt(II) and cadmium(II) metal-organic frameworks based on a rigid tricarboxylate ligand: Synthesis, crystal structures, magnetic and fluorescence properties. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2017.12.027] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Zhang X, Wang N, Geng L, Fu J, Hu H, Zhang D, Zhu B, Carozza J, Han H. Facile synthesis of ultrafine cobalt oxides embedded into N-doped carbon with superior activity in hydrogenation of 4-nitrophenol. J Colloid Interface Sci 2018; 512:844-852. [PMID: 29126073 DOI: 10.1016/j.jcis.2017.11.005] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2017] [Revised: 11/01/2017] [Accepted: 11/02/2017] [Indexed: 10/18/2022]
Abstract
Design and synthesis of low-cost catalysts with high activity and stability for hydrogenation reactions is an important research area of applied catalysis. In this work, we present a kind of ultrafine cobalt oxides encapsulated by N-doped carbon (donated as CoOx/CN) as efficient catalysts for hydrogenation of 4-nitrophenol (4-NP) process. The CoOx/CN was fabricated through a pyrolysis strategy using an N-containing metal-organic framework (Co-MOF) as precursor followed by a fine thermal-treatment. With an optimized pyrolysis temperature of 500 °C, the CoOx species present as ultrafine particles highly dispersed in the obtained catalyst (CoOx/CN-500). CoOx/CN-500 exhibits excellent activity and stability in hydrogenation of 4-NP at ambient conditions. The activity is much higher than that of not only bulk cobalt oxides, but also carbon supported CoOx catalysts. It could be used for more than 8 times without obvious fading in activity. In addition, the concrete role of Co-MOF precursor and pyrolysis condition in the catalyst design was investigated in detail. The interaction between organic ligands and Co ions and the confinement of the crystalline structure of Co-MOF could restrain the aggregation of Co ions during pyrolysis and lead to high dispersion of ultrafine CoOx species. Meanwhile, the N-containing ligands could be transformed into doped N species (pyridinic and pyrrolic N), endowing the CoOx species with high electron density and promoting the formation of active sites for the hydrogenation reaction.
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Affiliation(s)
- Xiuling Zhang
- Key Laboratory of Coordination Chemistry and Functional Materials in Universities of Shandong, College of Chemistry and Chemical Engineering, De Zhou University, De Zhou 253023, PR China; College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266000, PR China.
| | - Na Wang
- College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266000, PR China
| | - Longlong Geng
- Key Laboratory of Coordination Chemistry and Functional Materials in Universities of Shandong, College of Chemistry and Chemical Engineering, De Zhou University, De Zhou 253023, PR China.
| | - Junna Fu
- College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266000, PR China
| | - Hui Hu
- Key Laboratory of Coordination Chemistry and Functional Materials in Universities of Shandong, College of Chemistry and Chemical Engineering, De Zhou University, De Zhou 253023, PR China
| | - Dashuai Zhang
- Key Laboratory of Coordination Chemistry and Functional Materials in Universities of Shandong, College of Chemistry and Chemical Engineering, De Zhou University, De Zhou 253023, PR China
| | - Baoyong Zhu
- Key Laboratory of Coordination Chemistry and Functional Materials in Universities of Shandong, College of Chemistry and Chemical Engineering, De Zhou University, De Zhou 253023, PR China
| | - Jesse Carozza
- Department of Chemistry, University at Albany, State University of New York, Albany 12222, USA
| | - Haixiang Han
- Department of Chemistry, University at Albany, State University of New York, Albany 12222, USA
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