金属掺杂介孔氧化锆的合成与表征

Synthesis and Characterization of Metal Doped Mesoporous Zirconia

采用直接合成法在非水溶剂中成功合成了分别由锌、镁等元素掺杂改性的介孔氧化锆分子筛,并用XRD、N2吸附-脱附、NH3-TPD等方法对其进行表征,还考察了影响合成的一些因素。结果表明,金属元素能够均匀地掺杂于介孔氧化锆的晶体骨架中。金属的掺入增加了介孔材料的热稳定性,但其骨架有所收缩,降低了有序度;络合剂三乙醇胺的加入增加了材料的热稳定性;模板剂P123的使用增加了介孔分子筛的有序度;金属的掺杂使得介孔分子筛制备的固体超强酸的酸位增多,酸度增强。

Metal doped mesoporous zirconia molecular sieves were successfully prepared and modified by direct ly synthesized method in a non-aqueous solvent. XRD, N2 adsorption-desorption and NH3-TPD were adopted to cha- racterize the structure and properties of the as-synthesized materials. The results show that metal element, zinc or magnesium is homogeneously incorporated into the framework of ZrO2, they can increase the thermal stability of the as-synthesized materials, and yet decrease their order degrees due to shrinking of their skeleton structure; the thermal stability of the as-synthesized materials are also improved with adding the complexing agent triethanolamine; the order degrees of the as-synthesized materials are enhanced with using template P123; in addition, acid sites and acid degrees increase with metals doped on these solid superacids which are prepared with the as-synthesized mesoporous materials.