应用多晶X-射线衍射法研究了SAPO-5型分子筛结构,并经Rictveld法修正。结构测定得出,平均每个晶胞3。13个Sj原子等比取代P和Al进入骨架,但仍保持APO-5型分子筛的对称性和几何构型。Sj在骨架中与P、Al基本上成无序排列,从而使分子筛骨架不带电荷,在[001]方向也失去极性。因此若Si原子等比取代骨架中的P和Al,对调节APO-5分子筛的催化性能不会有显著作用。 The structure of SAPO-5 molecular sieve was studied by polycrystalline X-ray diffraction and corrected by Rictveld method. The results showed that an average of 3.13 Sj atoms per unit cell substituted the P and Al into the framework, while the symmetry and geometry of the APO-5 molecular sieve remained. Sj in the framework of P, Al is basically arranged in disorder, so that the molecular sieve framework uncharged in the [001] direction also lose polarity. Therefore, if the atomic ratio of Si atom is substituted for P and Al in the framework, the catalytic performance of the APO-5 molecular sieve will not be significantly affected.