基于长链离子液体模板合成Fe(Co、Ni)-MCM-48

Synthesis of Fe-,Co-and Ni-Containing MCM-48 Using Long-Chain Ionic Liquid Template

以两亲长链离子液体(氯化-1-十六烷基-3-甲基咪唑)为模板剂,采用水热合成方法,分别合成了含铁、钴和镍的立方介孔分子筛MCM-48。通过XRD、TEM、ICP-AES、FTIR、UV-Vis和N2吸附/脱附实验对其结构和形态进行了表征,并考察了钴掺杂量和模板剂用量对合成立方相结构的影响。结果表明,用该方法合成的试样具有较高的比表面积和规则的立方介孔孔道结构等特征;相对于铁和镍的掺杂试样,钴物种能以四面体的结构稳定地存在于立方介孔分子筛骨架中。

The long-chain ionic liquid 1-hexadecyl-3-methylimidazolium chloride（C16mimCl） was used as the tem-plate to prepare Fe-, Co- and Ni-containing mesoporous silicas with a cubic MCM-48-type structure via a hydrothermal synthesis procedure. The samples were characterized by XRD, TEM, ICP-AES, FTIR, UV-Vis and Nzadsorption-desorption. The effect of the amount of Co salt and C16mimCl in initial reaction mixture on the cubic mesostructure was discussed. The results show that the mesoporous materials obtained exhibit cubic la3d pore architectures, and are with high surface area and narrow pore size distribution. Co in the synthesis gel can be incorporated into the tetrahedral lattice site of mesoporons MCM-48, comparing with Fe-and Ni-doped samples.