文档介绍：淮北师范大学
2013届学士学位论文
Nb-Ti-SBA-15催化剂的制备及表征
系别: 化学系
专业: 材料化学
学号:
姓名:
指导教师:
指导教师职称: 教授
2012年 10 月 30 日
Nb-Ti-SBA-15催化剂的制备
摘要:以正硅酸四乙酯为硅源,表面活性剂P123为模板剂,通过模板法制备出介孔分子筛SBA-15,然后再以钛酸四正丁脂为钛源,Nb2O5为铌源在强酸性条件下通过浸渍法制备Nb-Ti-SBA-15催化剂,并借助XRD、SEM、IR和UV-Vis等表征手段对Nb-Ti-SBA-15进行表征,结果表明:Nb、Ti均高分散于SBA-15骨架中,制得的Nb-Ti-SBA-15催化剂保持了载体 SBA-15 高度有序的二维六方介孔结构。
关键词:介孔分子筛SBA-15; 浸渍法; Ti-SBA-15; Nb-SBA-15
The preparation and characterization of Nb-Ti-SBA-15
Abstract: Heteroatoms of Ti and Nb were effectively introduced into the framework of ordered mesoporous silica materials in strong acidic media by a two-step procedure. first, mesoporous SBA-15 were synthesized by template method, using ethyl silicate as as the Si source and surface active agent P123 as the template. The next thing was the preparation of Nb-Ti-SBA-15 using impregnation method, using tetrabutyl titanate as titanium source and Nb2O5 as niobium source. The synthesized materials were characterized by X-ray diffraction, scanning electron microscope, IR and UV-Vis spectrometer etc. The results showed that Nb、Ti were highly dispersed through the inside of SBA-15 and the prepared Nb-Ti-SBA-15 kept the highly ordered mesoporous two dimensional hexagonal structure and the mesoporous channel structure.
Key words: Mesoporous molecular sieve SBA-15;Impregnation method;Ti-SBA-15;Nb-SBA-15
目录
摘要 I
Abstract Ⅱ
1 引言 1
2 实验部分 1
1
1
2
实验步骤 2
SBA-15的合成 2
Nb-Ti-SBA-15的制备 2
3 Nb-Ti-SBA-15催化剂的表征 3
红外图: 3
广角XRD图 4
紫外漫反射图 5
4. 论文总结 6
参考文献 6
致谢 7
1 引言
赵东元和stucky教授等[1]用亲水的三嵌段共聚物P123为模板剂,以正硅酸乙酯为硅源在酸性条件下成功的制备出有序的六角相介孔硅分子筛SBA-15,孔径可达30nm,,其水热稳定性很高(100℃,50 h),规则的纳米级孔道,大的比表面积,均一的孔道直径分布,孔径可调变,壁厚且水热稳定很高,孔道内大量的硅羟基等特点[2-6]。所以其在催化、分离、生物及纳米材料领域有广泛的应用前景,而且介孔材料SBA-15的合成克服了MCM-4水热稳定性差、模板剂昂贵等缺点,为改性和应用提供了更广泛的空间[7]。SBA-15材料的出现被认为是介孔材料出现以来,在合成方面取得突破性进展。由于以上众多的优点,以嵌段共聚物作为结构导向剂合成介孔氧化硅材料SBA-15成为近年来研究的热点之一。
在催化应用中,虽然SBA-15有着优良的物理化学性质和结构特点,但由于它是纯氧化硅介孔材料,没有催化活性,需要负载活性组分。借助SBA-15优