کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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42533 | 45929 | 2009 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Activated zirconium oxide catalysts to synthesize dichloropentafluoropropane by the reaction of dichlorofluoromethane with tetrafluoroethylene Activated zirconium oxide catalysts to synthesize dichloropentafluoropropane by the reaction of dichlorofluoromethane with tetrafluoroethylene](/preview/png/42533.png)
Zirconium oxide catalysts for manufacturing dichloropentafluoropropanes (HCFC-225ca and 225cb) by the reaction of dichlorofluoromethane with tetrafluoroethylene were investigated. When activated by elemental fluorine or dichlorodifluoromethane, zirconium oxide exhibited high catalytic activity and better selectivity toward HCFC-225s in the reaction at ordinary temperatures. XRD and XPS analyses revealed that the fluorine-activated zirconium oxide catalyst is a mixture of zirconium oxide, zirconium tetrafluoride, and partially fluorinated zirconium oxide. These results suggest that zirconium oxide underwent a surface fluorination reaction, resulting in enhanced catalytic activity as a Lewis acid.
Dichloropentafluoropropanes (HCFC-225s) were synthesized by the reaction of dichlorofluoromethane with tetrafluoroethylene using activated zirconium oxide catalysts at ordinary temperatures. XRD and XPS analyses revealed that the fluorine-activated zirconium oxide catalyst is a mixture of zirconium oxide, zirconium tetrafluoride, and partially fluorinated zirconium oxide. CCl2F2-activated zirconium oxide and zirconium chlorofluoride catalysts were compared by studying the reaction kinetics.Figure optionsDownload as PowerPoint slide
Journal: Applied Catalysis A: General - Volume 359, Issues 1–2, 15 May 2009, Pages 158–164