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采用水热合成法,分别以HCl、H2SO4和HClO4为介质合成有序介孔分子筛SBA-15,通过X射线衍射表征SBA-15介孔分子筛的结构和晶相水热稳定性,用比表面积仪和透射电子显微镜表征SBA-15介孔分子筛的孔道水热稳定性。结果表明:在HClO4条件下制备的SBA-15介孔分子筛的长程有序度和晶相水热稳定性明显高于H2SO4和HCl条件下制备的样品。改变HClO4的浓度后发现20%HClO4条件下制备的SBA-15的晶相和孔道的水热稳定性最好,沸水处理条件下可以稳定存在150h。
The ordered mesoporous molecular sieves SBA-15 were synthesized by hydrothermal method using HCl, H2SO4 and HClO4 respectively. The structure and the hydrothermal stability of SBA-15 mesoporous molecular sieves were characterized by X-ray diffraction. The specific surface area The pore hydrothermal stability of SBA-15 mesoporous molecular sieves was characterized by transmission electron microscopy. The results show that the long-range order and the hydrothermal stability of SBA-15 mesoporous molecular sieve prepared under HClO4 conditions are obviously higher than those prepared under H2SO4 and HCl conditions. After changing the concentration of HClO4, it was found that the crystal phase and pore of SBA-15 prepared under the condition of 20% HClO4 had the best hydrothermal stability, which could stably exist for 150h under the condition of boiling water treatment.