Rapid microwaves synthesis of CoSi{sub x}/CNTs as novel catalytic materials for hydrogenation of phthalic anhydride

Journal Article · Mon Sep 15 00:00:00 EDT 2014 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/J.JSSC.2014.05.021· OSTI ID:22443392

Zhang, Liangliang ^[1]; Chen, Xiao; Jin, Shaohua; Guan, Jingchao ^[2]; Williams, Christopher T. ^[3]; Peng, Zhijian ^[1]; Liang, Changhai ^[2]

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1. School of Engineering and Technology, China University of Geosciences, Beijing 100083 (China)
2. Laboratory of Advanced Materials and Catalytic Engineering, Dalian University of Technology, Dalian 116024 (China)
3. Department of Chemical Engineering, University of South Carolina, Columbia, SC 29208 (United States)

CoSi{sub x}/CNTs catalysts with different CoSi{sub x} phases (CoSi, CoSi{sub 2}) have been rapidly synthesized via a microwave-assisted route and applied for the liquid phase hydrogenation of phthalic anhydride. The synthesized catalysts were analyzed and characterized by X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy-energy dispersive X-ray spectroscopy, thermogravimetric/derivative thermogravimetric analysis. The reaction progress of cobalt silicides and the ratio of Co:Si were monitored at different microwave irradiation times by XRD, giving insight into the formation mechanism. Compared to the Co/CNTs catalyst, all the prepared CoSi{sub x}/CNTs catalysts exhibited excellent activity and good selectivity to phthalide under mild reaction conditions (180–220 °C and 4.0 MPa H{sub 2}). This novel methodology can be applied to the synthesis of other transition metal silicides such as FeSi, Ni{sub 2}Si, and Cu{sub 4}Si. - Graphical abstract: CoSi{sub x}/CNTs catalysts with different CoSi{sub x} phases (CoSi{sub 2}, CoSi) have been rapidly synthesized via microwave-assisted route, which involves the vaporization of CoCl{sub 2} and subsequent reaction of CoCl{sub 2} with Si. - Highlights: • CoSi{sub x}/CNTs catalysts have been rapid synthesized via microwave-assisted route. • The phases of CoSi{sub x} were controlled by varying microwave time and Co:Si ratio. • FeSi, Ni{sub 2}Si and Cu{sub 4}Si were also synthesized via microwave-assisted route. • CoSi{sub x}/CNTs catalysts can be applied in hydrogenation of phthalic anhydride.

• OSTI ID: 22443392
• Journal Information: Journal of Solid State Chemistry, Vol. 217; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ANHYDRIDES
CATALYSTS
COBALT CHLORIDES
COBALT SILICIDES
HYDROGEN
HYDROGENATION
IRON SILICIDES
IRRADIATION
LIQUIDS
MICROWAVE RADIATION
SYNTHESIS
THERMAL GRAVIMETRIC ANALYSIS
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION
X-RAY PHOTOELECTRON SPECTROSCOPY
X-RAY SPECTROSCOPY