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含钛介孔SiO2催化剂Ti-MCM-41的低温合成及性能研究

发表时间:2012-04-15  浏览量:1199  下载量:413
全部作者: 杨穆,王戈,王莹莹
作者单位: 北京科技大学材料科学与工程学院
摘 要: 采用两步法在室温条件下合成含钛介孔SiO2催化剂Ti-MCM-41,采用小角X射线衍射(X-ray diffraction, XRD)、扫描式电子显微镜(scanning electron microscope, SEM)、高分辨透射电子显微镜(high resolution electronic microscope, HRTEM)、氮吸附、傅里叶变换红外光谱(Fourier transform infrared spectroscopy, FTIR)、紫外-可见光谱(ultraviolet-visible, UV-Vis)和电感耦合等离子体(inductively coupled plasma, ICP)等对其结构进行系统表征,结果表明材料存在有序的介孔结构。以环辛烯为目标底物,双氧水为氧源,研究其催化环氧化性能,考察不同Si/Ti比的介孔钛硅催化剂对其结构及催化性能的影响,以及催化剂表面修饰对催化性能的影响,结果表明:在一定范围内,随着钛含量增加,催化性能增加。并采用含苯环硅烷偶联剂对催化剂进行表面改性修饰,使得材料表面亲水性降低,催化效率提高。
关 键 词: 材料化学;MCM-41;钛硅催化材料;环氧化;表面修饰
Title: Low temperature synthesis and catalytic activity studies of titanium-containing mesoporous SiO2 catalyst Ti-MCM-41
Author: YANG Mu, WANG Ge, WANG Yingying
Organization: School of Materials Science and Engineering, University of Science and Technology Beijing
Abstract: Titanium-containing mesoporous SiO2 catalyst Ti-MCM-41 has been successfully synthesized by post synthesis approach at room temperature. The material has been characterized by small-angle X-ray diffraction (XRD), scanning electron microscope (SEM), high resolution electronic microscope (HRTEM), nitrogen adsorption/desorption isotherms, Fourier transform infrared spectroscopy (FTIR), ultraviolet-visible (UV-Vis) and inductively coupled plasma (ICP). The results demonstrate the existence of an ordered mesoporous structure. Mesoporous molecular sieve has good catalytic activity in the epoxidation of cyclooctene with aqueous H2O2 as an oxidant. The paper also investigates the influence of different Si/Ti ratio on the structure and performance of the mesoporous titanium silicalite catalyst and the influence of surface modification on the performance of the catalyst, and the results show that the appropriate increase of titanium content of the catalyst can enhance the catalytic efficiency. With diphenyldimethoxysilane modified the surface of mesoporous molecular sieves, the catalytic properties are also improved.
Key words: material chemistry; MCM-41; titanium silicalite catalyst; epoxidation; surface modification
发表期数: 2012年4月第7期
引用格式: 杨穆,王戈,王莹莹. 含钛介孔SiO2催化剂Ti-MCM-41的低温合成及性能研究[J]. 中国科技论文在线精品论文,2012,5(7):623-629.
 
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