杂原子MCM-41分子筛的合成和催化性能

采用水热合成法合成了金属原子(Zn,Ni,Fe,Al,Cu,Ce)掺杂的MCM-41介孔分子筛(简称T-MCM-41),并将其应用于邻苯二甲酸二(2-乙基已)酯(DOP)的合成反应,研究了不同原子的掺杂对T-McM-41的结构,比表面积和孔径、酸性及催化性能的影响.结果表明,所制备的T-McM-41仍然具有六方有序排列结构,比表匝f积较高(550-900 m2/g)、孔径大(3 nm左右),杂原子的引入使T-MCM-41产生了酸中心,从而使其对DOP的合成具有很好的催化活性和选择性.用T-MCM-41(T=Zn,Fe,Al,Cu)催化DOP的合成反应,在5 h的反应时间内苯酐的转化率可以达到95.5%以上,DOP的选择性可达到96.5%以上.T-MCM-41催化剂具有很好的稳定性,Al-MCM-41在重复使用5次后仍具有较好的催化活性.

Synthesis of MCM-41 mesoporous molecular sieves containing heteroatoms and their catalytic activity

MCM-41 mesoporous molecular sieves containing heteroatoms(Zn,Ni,Fe,Al,Cu,Ce) (T-MCM-41) were synthesized by direct hydrothermal process and were applied in the synthesis of dioctyl phthalate(DOP) in this paper.The effects of different heteroatoms incorporation on structure,specific surface area and pore volume,aciditity and catalytic activity of T-MCM-41 were investigated.The results show that T-MCM-41 which still remains the well-ordered hexagonal mesostructure of MCM-41 has high surface area(550-900 m~2/g...