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Davis等1988年首次合成出具有十八元环的大孔磷铝分子筛VPI-5,次年又以二正丙胺(DPA)和四丁基氢氧化铵(TBAOH)为导向剂合成出VPI-5分子筛.Crowder等根据结晶化学已知的键长、键角等数据,拟合出它的初结构,认为VPI-5分子筛晶体的对称性属六方晶系,空间群属C_6~3v-P_(63)cm. 从[001]方向俯视VPI-5,其骨架由六个6元环和十二个4元环构成,每两个4元环
In 1988, Davis et al. First synthesized the 18-membered macroporous aluminophosphate molecular sieve VPI-5. In the following year, VPI-5 molecular sieve was synthesized with di-n-propylamine (DPA) and tetrabutyl ammonium hydroxide (TBAOH) Based on the known bond length and bond angle data, Crowder et al. Fit the initial structure of VPI-5 molecular sieve. The symmetry of the VPI-5 molecular sieve is hexagonal and the space group C_6 ~ 3v-P_ (63) cm . Looking down the [001] direction VPI-5, the framework of six six-membered ring and twelve four-membered ring, each two four-membered ring