模板剂用量对SAPO-11分子筛的物理化学性质及催化萘与甲醇烷基化性能的影响

Effect of template content on the physicochemical properties and the catalytic performance of SAPO-11 for the alkylation of naphthalene with methanol

摘要:

考察了二正丙胺（DPA）模板剂用量对合成的SAPO-11分子筛的物化特性及催化萘与甲醇的烷基化的影响，并通过XRD、SEM、N2 adsorption-desorption、NH3-TPD、FT-IR和29SiMAS NMR等手段对合成的样品进行表征。结果表明：改变模板剂用量不仅可以调节SAPO-11的孔结构，还会改变Si在分子筛骨架上的分布，从而调节SAPO-11的酸性。当DPA/Al2O3比为1.5时，样品具有较大的比表面积和孔容，分别为215 m2٠g-1和0.173 cm3٠g-1；样品的Si区面积最小，Si（nAl）（0

Abstract:

Effects of the concentration of di-n-propylamine (DPA) in gel on the physicochemical properties and the catalytic performances of the alkylation of naphthalene with methanol as-synthesized SAPO-11 zeolites have been studied. Products were characterized using XRD, SEM, N2 adsorption-desorption, NH3-TPD, FT-IR and 29SiMAS. The results indicated that different template contents had strong influence on the pore structure, the Si distribution and thus the acidity of SAPO-11. The sample prepared at DPA:Al2O3 ratio of 1.5 (SAPO-11-1.5) possessed large surface area and pore volume, which was 215 m2٠g-1和0.173 cm3٠g-1, respectively, and small Si domains, large amount of Si (nAl) (0