镧、钒取代MCM-41分子筛的结构表征及其在苯酚羟基化反应中的催化性能  

Structure characterization of La and V incorporated MCM-41 molecular sieves and its catalytic performance for phenol hydroxylation

作　　者：王宇红[1] 袁联群[1] 俞磊[1] 项婷婷[1] 

机构地区：[1]上海应用技术学院化学与环境工程学院应用催化研究所,上海200235

出　　处：《化工学报》2010年第10期2565-2572,共8页CIESC Journal

基　　金：上海市教委重点学科项目(J51503);上海市教委一般学科项目(11YZ221)

摘　　要：采用水热法合成了双金属镧(La)和钒(V)取代MCM-41分子筛催化剂,使用X射线衍射、N2吸附、傅里叶变换红外光谱、紫外-可见漫反射光谱以及热重等表征技术研究了催化剂的结构。结果表明,该材料具有高度有序的二维六方结构,金属La和V以高度分散的四配位状态存在于分子筛的骨架中。在苯酚过氧化氢羟基化反应中La-V-MCM-41分子筛表现出比TS-1催化剂更好的催化活性和选择性,金属La和V协同作用,在提高H2O2有效利用率的同时,增加了目标产物苯二酚中对苯二酚的含量。La-V-MCM-41催化剂可以通过焙烧活化的方法进行再生使用。Bimetallic La and V incorporated MCM-41 molecular sieves were synthesized at hydrothermal condition and characterized by powder X-ray diffraction （XRD）,thermo gravimetry （TG）,Fourier-transform infrared spectroscopy（FTIR）,ultraviolet-visible diffuse reflectance spectra （UV-Vis）and N2 adsorption techniques.The results indicated that all the samples exhibited typical hexagonal arrangement of mesoporous structure with high surface area and the heteroatoms were,at least in some extent,incorporated into the framework of MCM-41.Catalytic performances of the obtained materials were evaluated in the hydroxylation of phenol with H2O2.The results showed that the La-V-MCM-41 catalyst had higher activity and selectivity compared with the TS-1 catalyst.By addition of metal La,not only the utilization efficiency of H2O2 improved,but also the content of hydroquinone increased.La-V-MCM-41 catalysts could be regenerated and reused by calcination.

关 键 词：镧 钒 MCM-41分子筛 表征 苯酚羟基化 

分 类 号：O643[理学—物理化学]