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Indian Journal of Chemistry -Section A (IJC-A) >
IJC-A Vol.50A [2011] >
IJC-A Vol.50A(12) [December 2011] >
| Title: | Vapor phase fluorination of 1,1,1-trifluoro-2-chloroethane over CrOx-Y2O3 catalysts: Effects of calcination atmosphere and chromium content |
| Authors: | Pu, Zhi-Ying
Yu, Hong-Bo
Jia, Wen-Zhi
Zhou, Huan
Wang, Yue-Juan
Luo, Meng-Fei |
| Keywords: | Catalysts
Oxides
Chromium oxide
Yttrium oxide
Fluorination
Vapor phase fluorination |
| Issue Date: | Dec-2011 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | CrOx-Y2O3
catalysts (CrYO) prepared by a coprecipitation method transformed to Cr2O3-YF3
(CrYF) catalysts after being fluorinated with HF. The effects of
calcination atmosphere
and chromium content on its catalytic activity for the vapor
phase fluorination of 1,1,1-trifluoro-2-chloroethane have been investigated.
The CrYF catalysts calcined in nitrogen atmosphere show higher catalytic
activity than those calcined in air. In
addition, the CrYF-20 and CrF catalysts (calcined in nitrogen
or air) show higher catalytic activity than CrYF-50 and CrYF-80 catalysts.
Characterization results indicate that the CrYO and CrYF catalysts calcined in
nitrogen atmosphere are amorphous and much easier to fluorinate with HF than
those calcined in air, while CrO-N and CrF-N exist mainly as crystalline phase
and difficult to be fluorinated. It is also observed that the surface acidity
plays an important role in the catalyst activity for the
vapor phase fluorination of HCFC-133a. |
| Page(s): | 1719-1724 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-0975(Online); 0376-4710(Print) |
| Source: | IJC-A Vol.50A(12) [December 2011]
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