Please use this identifier to cite or link to this item:
|Title:||Vapor phase fluorination of 1,1,1-trifluoro-2-chloroethane over CrOx-Y2O3 catalysts: Effects of calcination atmosphere and chromium content|
|Keywords:||Catalysts;Oxides;Chromium oxide;Yttrium oxide;Fluorination;Vapor phase fluorination|
|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.|
|Appears in Collections:||IJC-A Vol.50A(12) [December 2011]|
Files in This Item:
|IJCA 50A(12) 1719-1724.pdf||684.27 kB||Adobe PDF||View/Open|
Items in NOPR are protected by copyright, with all rights reserved, unless otherwise indicated.