高比表面积Cr2O3-α-AlF3催化剂的制备和应用

引用本文: 于洪波, 贾文志, 普志英, 王月娟, 鲁继青, 滕波涛, 罗孟飞. 高比表面积Cr₂O₃-α-AlF₃催化剂的制备和应用[J]. 物理化学学报, 2011, 27(11): 2677-2681. doi: 10.3866/PKU.WHXB20111014 shu

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

高比表面积Cr₂O₃-α-AlF₃催化剂的制备和应用

基金项目:
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)

摘要: 采用炭硬模板法制备了高比表面积Cr₂O₃-α-AlF₃催化剂. 该催化剂的合成过程主要包括三步: (1) 将一定浓度的蔗糖溶液浸渍到Cr₂O₃-γ-Al₂O₃中, 然后经过热处理, 使得蔗糖分解为炭; (2) 将含炭的Cr₂O₃-γ-Al₂O₃固体在400°C用HF气体进行完全氟化; (3) 在高温下利用燃烧法除去炭硬模板. 对所制备的催化剂进行了X射线衍射(XRD), 氮气吸脱附曲线, 氨气程序升温脱附(NH₃-TPD), 透射电镜(TEM), 扫描电镜(SEM)和X射线能量散射(EDX)技术表征. 结果表明, 氟化过程对Cr₂O₃-α-AlF₃催化剂比表面积有重要影响, 在最佳实验条件下, 能够得到比表面积为115 m²·g^-1的催化剂. 此催化剂对催化裂解二氟乙烷(HFC-152a)制备氟乙烯(VF)的催化活性明显高于直接氟化制备的Cr₂O₃-α-AlF₃催化剂, 这是因为高比表面积的Cr₂O₃-α-AlF₃催化剂具有较大的酸量.

关键词:

English

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

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: 27 October 2011
Fund Project:
浙江省自然科学基金(Y4100001)

浙江省科技计划(2009F70004, 2009R50020-6)资助项目

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:

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沈阳化工大学材料科学与工程学院沈阳 110142

高比表面积Cr₂O₃-α-AlF₃催化剂的制备和应用

English

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

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