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Vapor phase fluorination of 1,1,1-trifluoro-2-chloroethane over CrO<sub>x</sub>-Y<sub>2</sub>O<sub>3</sub> catalysts: Effects of calcination atmosphere and chromium content

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Title Vapor phase fluorination of 1,1,1-trifluoro-2-chloroethane over CrO<sub>x</sub>-Y<sub>2</sub>O<sub>3</sub> catalysts: Effects of calcination atmosphere and chromium content
 
Creator Pu, Zhi-Ying
Yu, Hong-Bo
Jia, Wen-Zhi
Zhou, Huan
Wang, Yue-Juan
Luo, Meng-Fei
 
Subject Catalysts
Oxides
Chromium oxide
Yttrium oxide
Fluorination
Vapor phase fluorination
 
Description 1719-1724
CrO<sub>x</sub>-Y<sub>2</sub>O<sub>3</sub> catalysts (CrYO) prepared by a coprecipitation method transformed to Cr<sub>2</sub>O<sub>3</sub>-YF<sub>3 </sub>(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.
 
Date 2011-11-30T10:23:02Z
2011-11-30T10:23:02Z
2011-12
 
Type Article
 
Identifier 0975-0975(Online); 0376-4710(Print)
http://hdl.handle.net/123456789/13107
 
Language en_US
 
Rights <img src='http://nopr.niscair.res.in/image/cc-license-sml.png'> <a href='http://creativecommons.org/licenses/by-nc-nd/2.5/in' target='_blank'>CC Attribution-Noncommercial-No Derivative Works 2.5 India</a>
 
Publisher NISCAIR-CSIR, India
 
Source IJC-A Vol.50A(12) [December 2011]