Cr掺杂对中孔MgF2酸性及孔结构的影响

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....

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Bibliographic Details
Published in催化学报 Vol. 34; no. 2; pp. 373 - 378
Main Author 牛怀成 李利春 李瑛 郭荔 唐浩东 韩文锋 刘化章
Format Journal Article
LanguageChinese
Published 浙江工业大学工业催化研究所,浙江杭州,310032%浙江省化工研究院有限公司,浙江杭州,310023 2013
Subjects
中孔氟化镁
二氟一氯甲烷
共沉淀法
歧化反应
氟化铬
chromium fluoride
歧化反应
mesoporous magnesium fluoride
中孔氟化镁
氟化铬
monochlorodifluoromethane
disproportionation
共沉淀法
二氟一氯甲烷
co-precipitation
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ISSN0253-9837
1872-2067
DOI10.3724/SP.J.1088.2013.20854

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Summary: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.
Bibliography: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)-MgF2with different Cr loadings were characterized by N2 adsorption-desorption, X-ray powder diffraction, transmission electron microscopy, pyridine adsorptionFourier transform infrared spectroscopy, and NH3 tempera-ture-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 catalystsamples doped with Cr show excellent catalytic performance in CHClF2 disproportionation.
mesoporous magnesium fluoride;chromium fluoride;monochlorodifluoromethane;disproportionation;co-precipitation
21-1195/O6
NIU Huaichenga, LI Lichuna, LI Yinga,*, GUO Lib,#, TANG Haodonga, HAN Wenfenga, LIU Huazhanga aInstitute of Industrial Catalysis,Zhejiang University of Technology, Hangzho
ISSN:0253-9837
1872-2067
DOI:10.3724/SP.J.1088.2013.20854