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采用共沉淀法和化学还原法制备一系列金属修饰的Ce/MCM-41分子筛催化剂。通过透射电镜(Transmission Electron Microscope,TEM)TEM对催化剂进行表征,并对La(Ni、Co)/Ce/MCM-41系列催化剂在二氧六环-水体系中催化解聚木质素的性能进行研究。试验结果表明:在该系列催化剂中Ni/Ce/MCM-41催化效果较好,在Ni负载量为20%、反应温度为260℃、反应时间为60 min、H2压力为2 MPa的反应条件下,解聚产物中乙醚萃取物达到46.1%。其中,主要单体产物为2-甲氧基酚、4-甲基愈创木酚、4-乙基愈创木酚、4-丙基愈创木酚。
A series of metal-modified Ce / MCM-41 molecular sieve catalysts were prepared by coprecipitation and chemical reduction. The properties of La (Ni, Co) / Ce / MCM-41 catalysts for the catalyzed depolymerization of lignin in dioxane-water system were investigated by transmission electron microscopy (TEM) . The experimental results show that the catalytic activity of Ni / Ce / MCM-41 is good in this series of catalysts. Under the reaction conditions of 20% Ni loading, 260 ℃ reaction temperature, 60 min reaction time and H2 pressure 2 MPa , Depolymerization product ether extract reached 46.1%. Among them, the main monomer products are 2-methoxy phenol, 4-methyl guaiacol, 4-ethyl guaiacol, 4-propyl guaiacol.