Please use this identifier to cite or link to this item: http://nopr.niscair.res.in/handle/123456789/13107
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
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: 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.
Description: 1719-1724
URI: http://hdl.handle.net/123456789/13107
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.50A(12) [December 2011]

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