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Solution Combustion Synthesis of Cr<sub>2</sub>O<sub>3</sub> Nanoparticles and the Catalytic Performance for Dehydrofluorination of 1,1,1,3,3-Pentafluoropropane to 1,3,3,3-Tetrafluoropropene
oleh: Haili Wang, Wenfeng Han, Xiliang Li, Bing Liu, Haodong Tang, Ying Li
Format: | Article |
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Diterbitkan: | MDPI AG 2019-01-01 |
Deskripsi
Cr<sub>2</sub>O<sub>3</sub> nanoparticles were prepared by solution combustion synthesis (SCS) with chromium nitrate as the precursor and glycine as the fuel. Commercial Cr<sub>2</sub>O<sub>3</sub> and Cr<sub>2</sub>O<sub>3</sub> prepared by a precipitation method were also included for comparison. The morphology, structure, acidity and particle size of fresh and spent Cr<sub>2</sub>O<sub>3</sub> catalysts were investigated by techniques such as XRD, SEM, TEM, BET and NH<sub>3</sub>-TPD. In addition, catalytic performance was evaluated for the dehydrofluorination of 1,1,1,3,3-pentafluoropropane (CF<sub>3</sub>CH<sub>2</sub>CHF<sub>2</sub>, HFC-245fa) to 1,3,3,3-tetra-fluoropropene (CF<sub>3</sub>CH=CHF, HFO-1234ze). The catalytic reaction rate of Cr<sub>2</sub>O<sub>3</sub> 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 Cr<sub>2</sub>O<sub>3</sub> and commercial Cr<sub>2</sub>O<sub>3</sub>, respectively. The selectivity to HFO-1234ze for all the catalysts maintains at about 80%. Compared with commercial and precipitated Cr<sub>2</sub>O<sub>3</sub>, Cr<sub>2</sub>O<sub>3</sub>-SCS prepared by SCS possesses higher specific surface area and acid amount. Furthermore, significant change in the crystal size of Cr<sub>2</sub>O<sub>3</sub> prepared by SCS after reaction was not detected, indicating high resistance to sintering.