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Title: CrO<sub>X</sub> -Y<sub>2</sub>O<sub>3</sub> 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
CrO<sub>x</sub>-Y<sub>2</sub>O<sub>3 </sub>catalysts
Lewis acidity
Issue Date: Sep-2010
Publisher: CSIR
Series/Report no.: Int. Cl.9 B01J23/26; C07B39/00
Abstract: <smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="metricconverter"> A series of CrO<sub>x</sub>-Y<sub>2</sub>O<sub>3</sub> catalysts has been prepared using a deposition-precipitation method and tested for vapor phase fluorination of dichlorodifluoromethane (CCl<sub>2</sub>F<sub>2</sub>) for synthesis of tetrafluoromethane (CF<sub>4</sub>). A comparative study using CCl<sub>2</sub>F<sub>2</sub> and CClF<sub>3</sub> as the reactants for the fluorination reaction reveals that the conversion of CCl<sub>2</sub>F<sub>2</sub> to CClF<sub>3</sub> is very fast, while that of CClF<sub>3</sub> to CF<sub>4</sub> is a rate-determining step. Pre-fluorinated CrO<sub>X</sub>-Y<sub>2</sub>O<sub>3</sub> catalyst calcined at 600 °C (CrYF-6) is found to be the most active for the reaction, (CF<sub>4</sub> 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.</smarttagtype>
Description: 1212-1216
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.49A(09) [September 2010]

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