Please use this identifier to cite or link to this item: http://nopr.niscair.res.in/handle/123456789/10176
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
Fluorination
CrO<sub>x</sub>-Y<sub>2</sub>O<sub>3 </sub>catalysts
Acidity
Lewis acidity
Oxides
Chlorofluorocarbons
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
URI: http://hdl.handle.net/123456789/10176
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.49A(09) [September 2010]

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