Citation: YU Hong-Bo, PU Zhi-Ying, WANG Yue-Juan, LU Ji-Qing, TENG Bo-Tao, LUO Meng-Fei. Preparation and Application of a Cr₂O₃-α-AlF₃ Catalyst with a High Specific Surface Area[J]. Acta Physico-Chimica Sinica, ;2011, 27(11): 2677-2681. doi: 10.3866/PKU.WHXB20111014 shu

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

YU Hong-Bo ¹ ,
¹ ,
PU Zhi-Ying ² ,
WANG Yue-Juan ¹ ,
LU Ji-Qing ¹ ,
TENG Bo-Tao ¹ ,
LUO Meng-Fei ^1,

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 Date: 28 June 2011
Available Online: 18 August 2011
Fund Project: 浙江省自然科学基金(Y4100001) (Y4100001)浙江省科技计划(2009F70004, 2009R50020-6)资助项目 (2009F70004, 2009R50020-6)

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.
- Cr₂O₃-&,
- alpha,
- -AlF₃,
- High specific surface area,
- Lewis acid,
- CH₃CHF₂ decomposition,
- X-ray diffraction
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Preparation and Application of a Cr2O3-α-AlF3 Catalyst with a High Specific Surface Area

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