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本文采用离子热合成法,以磷酸为磷源、异丙醇铝为铝源,在溴化1-丁基-3-甲基咪唑鎓([BMIM]Br)离子液体中于280℃快速合成了AlPO_4-42分子筛,并用该方法快速合成了其他类型的磷酸铝分子筛。通过X射线衍射、扫描电镜、比表面积孔隙率分析、固体核磁等表征手段研究了不同物料配比、模板剂、晶化时间对合成AlPO_4-42分子筛的影响以及AlPO_4-42分子筛的比表面积、孔容大小和孔道中的填充物。结果发现,在4min时已经形成了AlPO_4-42分子筛的结构。合成出的AlPO_4-42分子筛具有十四面体的形貌,这与采用常规方法得到的AlPO_4-42分子筛晶体的立方体形貌明显不同,而且AlPO_4-42分子筛的比表面积和孔容都有所改变。在合成AlPO_4-42分子筛的过程中离子液体和模板剂协同导向产物的形成。
In this paper, ionic thermal synthesis was used to synthesize phosphoric acid as the phosphorus source and aluminum isopropoxide as the aluminum source at 280 ℃ in 1-butyl-3-methylimidazolium bromide ([BMIM] Br) AlPO_4-42 molecular sieve, and using this method to quickly synthesize other types of aluminum phosphate molecular sieve. The effect of different material ratio, template agent and crystallization time on the synthesis of AlPO_4-42 molecular sieve as well as the specific surface area, pore area and porosity of AlPO_4-42 molecular sieve were investigated by X-ray diffraction, scanning electron microscopy, surface area porosity analysis and solid state nuclear magnetic resonance The size and fill in the channel. As a result, it was found that the structure of AlPO 4 2-42 molecular sieve has been formed at 4 minutes. The synthesized AlPO_4-42 molecular sieve has the morphology of tetradecahedron, which is obviously different from the cubic morphology of the AlPO_4-42 molecular sieve crystals obtained by the conventional method, and the specific surface area and pore volume of the AlPO_4-42 molecular sieve are changed . The formation of synergistic products of ionic liquids and templating agents during the synthesis of AlPO 4 2- zeolite.