新型硅磷酸铝分子筛CHSAPO-7的合成与性能研究

Studies on the Synthesis and Properties of Novel Silicoalummophosphate Molecular Sieve CHSAPO-7

用水热法在二异丙胺-Al_2O_3-P_2O_5-SiO_2-H_2O体系中合成了新型硅磷酸铝分子筛CHSAPO-7。所得样品用X射线粉末衍射和红外光谱分析进行了表征。电子探针能谱分析表明,Si原子存在于分子筛的晶体骨架上。测定了CHSAPO-7的化学组成,研究了它的晶体形貌、吸附性能和热稳定性,同时考察了二异丙胺用量、反应混合物的初始pH值等合成条件对产物结晶相的影响。

A novel silicoaluminophosphate molecular sieve CHSAPO-7 was synthesized hy-drothermally in the system [(i-C3H7)2NH]-Al2O3-P2O5-SiO2-H2O. The samples obtained were characterized by means of X-ray powder diffraction analysis and infrared spectroscopy. The result of electron probe energy dispersion analysis of CHSAPO-7 indicates that Si atoms are inserted into the framework of CHSAPO-7. The chemical composition of CHSAPO-7 was determined. The properties of CHSAPO-7 , such as crystal morphology, adsorption capacities and thermal stabilitity, were studied. In addition, the influence of the amount of diisopropylamine used and the initial pH value of the reaction mixture on the crystal phase of product was investigated.