Acta Phys. -Chim. Sin. ›› 2009, Vol. 25 ›› Issue (02): 336-340.doi: 10.3866/PKU.WHXB20090224

• ARTICLE • Previous Articles     Next Articles

Characterization and Performance of CrOx-Y2O3 Catalysts for the Synthesis of 1,1,1,2-Tetrafluoroethane

QIAN Lin; XING Li-Qiong; BI Qing-Yuan; LI Hong-Fang; CHEN Ke-Feng; ZHANG Xue-Liang; LU Ji-Qing; LUO Meng-Fei   

  1. Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, Zhejiang Province, P. R. China; Zhejiang Qu Hua Fluor-Chemistry Company Limited, Quzhou 324004, Zhejiang Province, P. R. China
  • Received:2008-10-30 Revised:2008-12-02 Published:2009-01-16
  • Contact: LUO Meng-Fei

Abstract: The synthesis of 1,1,1,2-tetrafluoroethane from 2-chloro-1,1,1-trifluoroethane was performed over CrOx-Y2O3 catalysts prepared by a co-precipitation method. The effect of yttrium precursor on the CrOx species was investigated. The catalysts were prepared using hydroxide, chloride, and nitrate yttrium precursors and were denoted as CrYO-H, CrYO-Cl, and CrYO-N, respectively. After the pre-fluorination these catalycts were denoted as CrYF-H, CrYF-Cl, and CrYF-N, respectively. Catalytic activity decreased in the following order: CrYF-H>CrYF-Cl>CrYF-N. The highest activity obtained for the CrYF-H catalyst could be attributed to the highest content of Cr(VI) on the catalyst surface. This species then transformed into an active species such as CrOxFy or Cr(OH)xFy during the activation process. The presence of CrF3, which originated fromthe Cr(VI), resulted in decreased activity.

Key words: 1,1,1,2-Tetrafluoroethane, Fluorination, CrOx-Y2O3 catalyst, Chromiumoxide species


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