Acta Phys. -Chim. Sin. ›› 2011, Vol. 27 ›› Issue (11): 2677-2681.doi: 10.3866/PKU.WHXB20111014

• CATALYSIS AND SURFACE SCIENCE • Previous Articles     Next Articles

Preparation and Application of a Cr2O3-α-AlF3 Catalyst with a High Specific Surface Area

YU Hong-Bo1, JIAWen-Zhi1, PU Zhi-Ying2, WANG Yue-Juan1, LU Ji-Qing1, TENG Bo-Tao1, LUO Meng-Fei1   

  1. 1. Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, Zhejiang Province, P. R. China;
    2. Research Center of Analysis and Measurement, Zhejiang University of Technology, Hangzhou 310014, Zhejiang Province, P. R. China
  • Received:2011-06-28 Revised:2011-08-11 Published:2011-10-27
  • Contact: LUO Meng-Fei
  • Supported by:

    The project was supported by the Natural Science Foundation of Zhejiang Province, China (Y4100001) and Science Technology Planning Project of Zhejiang Province, China (2009F70004, 2009R50020-6).

Abstract: A high specific surface area Cr2O3-α-AlF3 catalyst was prepared using a carbon hard template method. The synthesis procedure consisted of three consecutive steps: (1) the impregnation of a sucrose (C12H22O11) aqueous solution with Cr2O3-γ-Al2O3 and subsequent thermal treatment; (2) the thermal treatment of the obtained solid with HF, C@Cr2O3-γ-Al2O3 can be completely transformed into C@Cr2O3-γ-AlF3 at 400°C with hydrogen fluoride; (3) the removal of the carbon template in C@Cr2O3-γ- AlF3 upon high temperature combustion giving the high surface area Cr2O3-γ-AlF3 (115 m2·g-1). The catalysts were characterized by X-ray diffraction (XRD), N2 physisorption, ammonia temperatureprogrammed desorption (NH3-TPD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and energy dispersion X-ray (EDX) techniques. We found that the fluorination process was crucial for the resulting Cr2O3-α-AlF3 with a high specific surface area of 115 m2·g-1 under optimal conditions. The Cr2O3-α-AlF3 catalyst with a high specific surface area was more active for the decomposition of 1,1-difluoroethane than the catalyst prepared by the direct fluorination of Cr2O3-γ-Al2O3, because it contained a higher amount of acid sites.

Key words: Cr2O3-&, alpha, -AlF3, High specific surface area, Lewis acid, CH3CHF2 decomposition, X-ray diffraction


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