Preparation and Application of a Cr_2O_3-α-AlF_3 Catalyst with a High Specific Surface Area
Acta Physico-chimica Sinica(2011)
摘要
A high specific surface area Cr_2O_3-α-AIF_3 catalyst was prepared using a carbon hard template method.The synthesis procedure consisted of three consecutive steps:(1) the impregnation of a sucrose (C_(12)H_(22)O_(11)) aqueous solution with Cr_2O_3-γ-Al_2O_3 and subsequent thermal treatment;(2) the thermal treatment of the obtained solid with HF,C@Cr_2O_3-γ-AI_2O_3 can be completely transformed into C@Cr_2O_3-γ-AIF_3 at 400℃with hydrogen fluoride;(3) the removal of the carbon template in C@Cr_2O_3-γ-AIF_3 upon high temperature combustion giving the high surface area Cr_2O_3-γ-AIF_3(115 m~2·g~(-1)).The catalysts were characterized by X-ray diffraction(XRD),N_2 physisorption,ammonia temperature-programmed desorption(NH_3-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 Cr_2O_3-α-AIF_3 with a high specific surface area of 115 m~2·g~(-1) under optimal conditions.The Cr_2O_3-α-AIF_3 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 Cr_2O_3-γ-Al_2O_3, because it contained a higher amount of acid sites.
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关键词
catalyst
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