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Indian Journal of Chemistry -Section A (IJC-A) >
IJC-A Vol.49A [2010] >
IJC-A Vol.49A(09) [September 2010] >
| 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 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-0975(Online); 0376-4710(Print) |
| Source: | IJC-A Vol.49A(09) [September 2010]
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