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Molecules. 2019 Jan 20;24(2). pii: E361. doi: 10.3390/molecules24020361.

Solution Combustion Synthesis of Cr₂O₃ Nanoparticles and the Catalytic Performance for Dehydrofluorination of 1,1,1,3,3-Pentafluoropropane to 1,3,3,3-Tetrafluoropropene.

Author information

1
Institute of Industrial Catalysis, Zhejiang University of Technology, Zhejiang 310032, China. wanghailii@outlook.com.
2
Institute of Industrial Catalysis, Zhejiang University of Technology, Zhejiang 310032, China. hanwf@zjut.edu.cn.
3
Institute of Industrial Catalysis, Zhejiang University of Technology, Zhejiang 310032, China. lxl199458@163.com.
4
Institute of Industrial Catalysis, Zhejiang University of Technology, Zhejiang 310032, China. 17326058928@163.com.
5
Institute of Industrial Catalysis, Zhejiang University of Technology, Zhejiang 310032, China. tanghd@zjut.edu.cn.
6
Institute of Industrial Catalysis, Zhejiang University of Technology, Zhejiang 310032, China. liying@zjut.edu.cn.

Abstract

Cr₂O₃ nanoparticles were prepared by solution combustion synthesis (SCS) with chromium nitrate as the precursor and glycine as the fuel. Commercial Cr₂O₃ and Cr₂O₃ prepared by a precipitation method were also included for comparison. The morphology, structure, acidity and particle size of fresh and spent Cr₂O₃ catalysts were investigated by techniques such as XRD, SEM, TEM, BET and NH₃-TPD. In addition, catalytic performance was evaluated for the dehydrofluorination of 1,1,1,3,3-pentafluoropropane (CF₃CH₂CHF₂, HFC-245fa) to 1,3,3,3-tetra-fluoropropene (CF₃CH=CHF, HFO-1234ze). The catalytic reaction rate of Cr₂O₃ prepared by SCS method is as high as 6 mmol/h/g, which is about 1.5 times and 2 times higher than that of precipitated Cr₂O₃ and commercial Cr₂O₃, respectively. The selectivity to HFO-1234ze for all the catalysts maintains at about 80%. Compared with commercial and precipitated Cr₂O₃, Cr₂O₃-SCS prepared by SCS possesses higher specific surface area and acid amount. Furthermore, significant change in the crystal size of Cr₂O₃ prepared by SCS after reaction was not detected, indicating high resistance to sintering.

KEYWORDS:

Cr2O3; HFC-245fa; HFO-1234ze; dehydrofluorination; nanoparticles; solution combustion synthesis

PMID:
30669524
PMCID:
PMC6359547
DOI:
10.3390/molecules24020361
[Indexed for MEDLINE]
Free PMC Article

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