柱撑蒙脱土的真空脱氢炭化及孔结构变化研究  

Vacuum Dehydrogenate Carbonization and Pore Structure Changes of Pillared Montmorillonite

作　　者：张增志[1] 杜红梅[1] 杨春卫[1] 

机构地区：[1]中国矿业大学(北京)生态功能材料研究所,北京100083

出　　处：《材料工程》2014年第11期79-84,共6页Journal of Materials Engineering

基　　金：教育部科学技术研究重点项目(106086)

摘　　要：采用十六烷基三甲基溴化铵对钠基蒙脱土经过有机化柱撑后在真空条件下进行脱氢炭化处理制备得到炭化柱撑蒙脱土。采用热分析(TG-DTA)、X射线衍射(XRD)、扫描电子显微镜(SEM)及氮气吸脱附等方法对炭化柱撑蒙脱土的热稳定性、层间距及孔结构等方面进行了表征和分析。结果表明:经过脱氢炭化处理,柱撑蒙脱土的热稳定性有了明显提高。样品形貌呈片层状,孔结构以中孔为主。随着炭化温度的升高,样品的片层结构更加明显,层间距和平均孔径表现为先增大后减小,比表面积表现为持续增大,孔结构更加发达,吸附性能得到大大提升。A kind of carbonized pillared montmorillonite was prepared. Na-montorillonite was organically modified by cetyl trimethyl ammonium bromide and then carbonized at different carbonization temperature under vacuum condition. Thermogravimetry-differential thermal analyzer (TG-DTA) was used to analyze its thermal stability, X-ray diffraction (XRD) was used to determine its interlayer distance changes, scanning electron microscope (SEM) was used to observe its micro morphology, and low-temperature nitrogen adsorption analysis was used to characterize the pore structure and the specific surface area of the carbonized pillared montmorillonite. The results show that the carbonized montmorillonite is mainly based on mesopores. Vacuum carbonization makes its lamellar structure more obvious and its thermal property more stable. As the carbonization temperature rises, the interlayer distance and the average pore diameter of the carbonized montmorillonite increase first and then decrease, while the BET specific surface area increases all the time. Adsorption property of the carbonized pillared montmorillonite has been greatly improved due to its well-developed pore structure.

关 键 词：柱撑蒙脱土 层间距 热稳定性 孔结构 孔径分布 炭化温度 

分 类 号：S156.3[农业科学—土壤学]