“一步法”合成多级孔SAPO-34分子筛

One Step Synthesis of SAPO-34 Molecular with Hierarchical Porosity

以TPOAC和硅溶胶为硅源,合成了多级孔SAPO-34分子筛,总比表面积达到649 m2·g-1。详细考察了TPOAC和硅溶胶的配比对多级孔SAPO-34外比表面的影响,通过XRD、BET、SEM、NH3-TPD等对其结构进行表征,结果表明多级孔SAPO-34的外比表面积可调变,晶体外观有较多缺陷位置,弱酸量减少,强酸位有变弱的趋势。在TPOAC与硅溶胶的投料比为3∶2,晶化时间为10 d,投料比为nAl2O3∶nP2O5∶nSi∶nTEAOH∶nH2O=1∶0.9∶0.5∶2∶60时,合成的多级孔SAPO-34的外比表面积达到最大,为100 m2·g-1。

Meso-SAPO-34 molecular sieve was synthesized with TPOAC and colloidal silica as the silica source, the total surface area is up to 649 m2·g-1. The ratio of TPOAC and silica sol was investigated, which affects external surface area of SAPO-34. The structure was determined by XRD, BET, SEM, NH3-TPD, results show that mesoporous SAPO-34 external surface area can be adjusted, more the defect position crystal appearance, reduce the amount of strong acid weak acid, a weak trend.Under the condition of the ration of TPOAC and silica sol was 3：2, reaction time was 10 days and the ratio of nAl2O3∶nP2O5∶nSi∶nTEAOH∶nH2O=1∶0.9∶0.5∶2∶60, the external surface area of synthetic mesoporous SAPO-34 reaches the maximum, the value is 100 m2-· g-1.