摘要
分别以两种非离子表面活性剂C18(EO) 10 、C12 Ph(EO) 10 为模板剂 ,硅酸四乙酯 (TEOS)为硅源 ,钛酸四丁酯 (TBOT)为钛源 ,乙醇、异丙醇为溶剂分别合成了两种含钛中孔分子筛Ti MSU 1和Ti MSU 2 .采用XRD、FT IR、UV Vis、元素分析 (ICP)法、N2 吸附 脱附等方法对合成的分子筛进行了结构测试和表征 .将得到的Ti MSU 1分子筛前体在高压釜中进行水热处理后 ,其孔道对称性或有序性显著增强 ,焙烧过程中热诱导的晶层收缩不再明显 ,而同样条件的热处理对Ti MSU 2分子筛孔道结构改性不大 .两种Ti MSU分子筛均对苯乙烯具有催化氧化性能 .苯乙烯转化率随中孔分子筛中含钛量的增大而增大 .Ti MSU 1分子筛与Ti MSU 2分子筛在催化性能上没有太大差别 。
Two kinds of titanium-containing mesoporous molecular sieves Ti-MSU-1 and Ti-MSU-2 were synthesized by using nonionic surfactants C18(EO)10 or C12Ph(EO)10 as templates respectively, TEOS as silicate source, TBOT as titanium source, ethanol and isopropanol as cosolvents. Structures of the synthesized molecular sieves were measured and characterized by XRD, FT-IR, UV-Vis, elemental analysis and N2 absorption-desorption methods. Hydrothermal treatment in an autoclave of the molecular sieves precursor could help to enhance the symmetry and the ordered degree of the mesoporous structures of Ti-MSU-1 molecular sieve. However, the same method could not modify the mesoporous structures of Ti-MSU-2 molecular sieves remarkably. Both Ti-MSU-1 and Ti-MSU-2 molecular sieves showed catalytic activity to oxidation reaction of styrene. Conversion of styrene increased with increases of Ti content in the molecular sieves framework. Catalytic oxidation performance of Ti-MSU-1 was comparable to that of Ti-MSU-2, which corresponded to similar pore structures.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2004年第8期1353-1357,共5页
CIESC Journal
基金
国家自然科学基金项目 (No 2 0 0 2 60 0 5 )
中国石化集团总公司 (No X5 980 11)~~
关键词
Ti-MSU
中孔分子筛
合成
催化氧化
Autoclaves
Ethanol
Fourier transform infrared spectroscopy
Nitrogen
Oxidation
Silicates
Styrene
Surface active agents
Synthesis (chemical)
Titanium compounds
Ultraviolet spectroscopy
X ray diffraction analysis
