柱撑粘土是当前分子工程学研究最为普遍的一族微孔/介孔材料.Ti柱撑粘土以其热稳定性高、表面酸性强和催化性能高而引人注目.采用水解法制备了Ti柱撑粘土(Ti-PILC),通过X射线衍射分析(XRD)、比表面积和孔径分布(BET)、氢程序升温还原(H2-TPR)等方法研究了TiO2在Na蒙脱石上氧物种的催化反应特性.结果表明,Ti柱撑粘土比表面积急剧增大,但TiCl4水解法产生的高浓度酸对皂土结构有一定影响,Ti柱撑粘土的还原温度要比单纯的TiO2粉体降低500℃,具有更高的氧活性,可望在催化领域得到应用.
Pillared clays constitute one of the most widely studies families among the new group of mircroporous or mesoporous materials developed by molecular engineering.Ti-pillared clay is paid attention to in this field for its high thermal stability,strong surface acidity and catalytic activity.Ti-pillared clay is prepared by TiCl4 hydrolysis.The reducibility and structural characteristics of the samples are revealed and determined with hydrogen temperature programmed reduction,X-ray diffraction and BET surface area measurement.It is found that TiO2-pillared clay's special surface area is dramatically increased.Acid treatment is influential on the structure of bentonite.Results show that the reduction temperature of TiO2,when intercalated in the interlayer of Na-bentonite,is decreased for more than 500℃ compared with TiO2.It is expected that highly dispersed TiO2 in the interlayer of Na-bentonite has a wide potential application in the advanced catalytic field.
参考文献
| [1] | Haydn H Murray .Traditional and new applications for kaolin,smectite,and palygorskite:a general overview[J].Applied Clay Science,2000,17:207. |
| [2] | Vaia R A et al.Synthesis and properties of two dimensional nanostructures by direct intercalation of polymer melts in layered silicates[J].Chemistry of Materials,1993,5:1694. |
| [3] | Kommann X;Lindberg H;Berglund L A .Synthesis of exopy-clay nanocomposites:influence of the nature of the clay on structure[J].Polymer,2001,42:1303. |
| [4] | 吴越.催化化学[M].北京:科学出版社,1990:417. |
| [5] | 杨南如,徐玲玲.粘土的结构特点和开发利用[J].建筑材料学报,2003(04):337-344. |
| [6] | 陈晓银;陶龙骧;郑禄彬 .钛层柱粘土的合成[J].催化学报,1994,15(05):355. |
| [7] | 黄继泰.粘土矿物的结构特征及其应用研究[J].结构化学,1996(06):438. |
| [8] | 吴平霄,张惠芬,郭九皋,刘小勇,胡澄.蒙脱石酸处理产物的微结构变化研究[J].无机材料学报,1999(06):909-914. |
| [9] | Ding Z;Zhu H Y;Lu G Q et al.Photocatalytic properties of tita-nia pillared clays by different drying methods[J].Journal of Colloid and Interface Science,1999,209:193. |
| [10] | Del Castille H L .Preparation and catalytic activity of titanium pillared montmorillonite[J].Applied Catalysis A:General,1993,103:23. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%