Cr掺杂对中孔MgF_2酸性及孔结构的影响  

Effect of Cr-doping on the acidity and pore structure of mesoporous magnesium fluoride

作　　者：牛怀成[1] 李利春[1] 李瑛[1] 郭荔[2] 唐浩东[1] 韩文锋[1] 刘化章[1] 

机构地区：[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

出　　处：《催化学报》2013年第2期373-378,共6页

基　　金：浙江省钱江人才计划(2010R10039);国家自然科学基金(20803064)~~

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.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.

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 

分 类 号：O643.36[理学—物理化学]