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Title: CrOX -Y2O3 catalysts for vapor phase fluorination of dichlorodifluoromethane
Authors: Jia, Wen-Zhi
Xing, Li-Qiong
Qian, Lin
Chen, Xin
Wang, Yue-Juan
Lu, Ji-Qing
Chen, Ke-Feng
Zhang, Xue-Liang
Luo, Meng-Fei
Keywords: Catalysts;Fluorination;CrOx-Y2O3 catalysts;Acidity;Lewis acidity;Oxides;Chlorofluorocarbons
Issue Date: Sep-2010
Publisher: CSIR
IPC Code: Int. Cl.9 B01J23/26; C07B39/00
Abstract:  A series of CrOx-Y2O3 catalysts has been prepared using a deposition-precipitation method and tested for vapor phase fluorination of dichlorodifluoromethane (CCl2F2) for synthesis of tetrafluoromethane (CF4). A comparative study using CCl2F2 and CClF3 as the reactants for the fluorination reaction reveals that the conversion of CCl2F2 to CClF3 is very fast, while that of CClF3 to CF4 is a rate-determining step. Pre-fluorinated CrOX-Y2O3 catalyst calcined at 600 °C (CrYF-6) is found to be the most active for the reaction, (CF4 yield 95%) and is stable during the testing period for the fluorination reaction. The characterization results indicate that the catalytic activity depends on the coordination of active Cr species and Lewis acid sites.
Page(s): 1212-1216
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.49A(09) [September 2010]

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