MCM-41介孔分子筛材料的氨微量吸附量热法酸性研究  

STUDY ON ACID PROPERTIES OF MCM41 MESOPOROUSMOLECULAR SIEVE MATERIALS

作　　者：何农跃[1,2,3] 李大塘[1,2,3] 沈俭一 屠迈[1,2,3] 鲍书林 须沁华[1,2,3] 

机构地区：[1]东南大学分子和生物分子电子学实验室 [2]南京大学化学系 [3]湘潭师范学院化学系

出　　处：《催化学报》1999年第4期475-478,共4页

基　　金：国家自然科学基金

摘　　要：Ｍｏｂｉｌ公司研究人员１９９２年首次报道的Ｍ４１Ｓ介孔分子筛材料，由于其孔径可在１５～１０ｎｍ间调变，从而打破了沸石分子筛合成的传统概念［１］；其中最重要的成员ＭＣＭ４１因其稳定的六角形结构而特别具有应用前景．近年来，有关此类材料的研究已引起各国...The acidity of mesoporous materials FeSiMCM41, LaSiMCM41, SiMCM41, AlSiMCM41 and HAlSiMCM41 has been investigated by microcalorimetric measurement of NH3 adsorption and temperatureprogrammed NH3 desorption method. In the initial stage of adsorption, the acid strength sequence is SiMCM41>HAlSiMCM41>AlSiMCM41>FeSiMCM41>LaSiMCM41, in agreement with that found for microporous molecular sieve materials. A small number of strong acid sites of SiMCM41 should result from the aluminum impurity contained in the silica source material. The acid density sequence is HAlSiMCM41AlSiMCM41>FeSiMCM41>LaSiMCM41SiMCM41 and can be explained by the existing state of trivalent atoms in these samples reported in previous work. This sequence is consistent with that from NH3TPD measurement. However, the technique of microcalorimetric adsorption is preferable in studying those samples where NH3TPD plots could not be back to baseline at elevated temperature.

关 键 词：氨 微量吸附量热 MCM-41 介孔 分子筛 酸性 

分 类 号：O643.36[理学—物理化学]