催化学报 ›› 2013, Vol. 34 ›› Issue (2): 373-378.DOI: 10.3724/SP.J.1088.2012.20854

• 研究论文 • 上一篇    下一篇

Cr 掺杂对中孔 MgF2 酸性及孔结构的影响

牛怀成1, 李利春1, 李瑛1,a, 郭荔2,b, 唐浩东1, 韩文锋1, 刘化章1   

  1. 1浙江工业大学工业催化研究所, 浙江杭州 310032; 2浙江省化工研究院有限公司, 浙江杭州 310023
  • 收稿日期:2012-08-30 修回日期:2012-10-18 出版日期:2013-02-05 发布日期:2013-02-05

Effect of Cr-Doping on the Acidity and Pore Structure of Mesoporous Magnesium Fluoride

NIU Huaicheng1, LI Lichun1, LI Ying1,a, GUO Li2,b, TANG Haodong1, HAN Wenfeng1, LIU Huazhang1   

  1. 1Institute of Industrial Catalysis, Zhejiang University of Technology, Hangzhou 310032, Zhejiang, China; 2Zhejiang Chemical Industry Research Institute Co., Ltd., Hangzhou 310023, Zhejiang, China
  • Received:2012-08-30 Revised:2012-10-18 Online:2013-02-05 Published:2013-02-05

摘要: 采用共沉淀法制备了 MgF2, CrF3 与不同 Cr 含量的 Cr(x)-MgF2 样品, 采用 X 射线粉末衍射、N2 物理吸附-脱附、透射电镜、吡啶吸附的傅里叶变换红外光谱和 NH3 程序升温脱附等手段对样品的晶相结构、孔结构及表面性质进行了表征, 并运用 CHClF2 的歧化反应评价了它们的催化活性. 结果发现, Cr 物种以无定形的形式掺杂在 MgF2 中, 抑制了其晶粒的长大, 使得 MgF2 的比表面积增加, 孔径减小, 并增强了其表面酸性. Cr 掺杂的 MgF2 在 CHClF2 的歧化反应中具有优异的催化性能.

关键词: 中孔氟化镁, 氟化铬, 二氟一氯甲烷, 歧化反应, 共沉淀法

Abstract: The effect of Cr-doping on the acidity and pore structure of mesoporous magnesium fluoride prepared by co-precipitation was investigated. The prepared MgF2, CrF3, and Cr(x)-MgF2 with different Cr loadings were characterized by N2 adsorption-desorption, X-ray powder diffraction, transmission electron microscopy, pyridine adsorption Fourier transform infrared spectroscopy, and NH3 temperature-programmed desorption. The catalytic activity of MgF2 and Cr(x)-MgF2 was tested in the disproportionation of CHClF2. The doped Cr in the MgF2 results in the improvements of the specific surface area and surface Lewis acidity. Meanwhile, the MgF2 catalyst samples doped with Cr show excellent catalytic performance in CHClF2 disproportionation.

Key words: mesoporous magnesium fluoride, chromium fluoride, monochlorodifluoromethane, disproportionation, co-precipitation