改进水热法合成SAPO-11及其酸性和异构化活性  

Acidity and Isomerization Activity of SAPO-11 Synthesized by an Improved Hydrothermal Method

作　　者：刘平[1] 任杰[1] 孙予罕[1] 

机构地区：[1]中国科学院山西煤炭化学研究所煤转化国家重点实验室

出　　处：《催化学报》2008年第4期379-384,共6页

基　　金：国家重点基础研究发展计划(973计划,项目2005cb221402).

摘　　要：在含异丙醇的体系中,采用程序升温水热法合成了SAPO-11分子筛,并通过X射线衍射、扫描电镜、低温氮物理吸附、氨程序升温脱附、吡啶吸附红外光谱和29Si固体核磁共振等手段进行了表征.结果表明,与常规水热合成法相比,该方法合成的SAPO-11结晶度高,晶粒小,微孔分布集中,酸性强,同时还具有较大的比表面积和微孔孔容.以该分子筛制备的Pt/SAPO-11催化剂在正十四烷临氢异构反应中表现出较高的催化活性和异构选择性.Medium-pore molecular sieve SAPO-11 was synthesized using an improved hydrothermal method, which involves programmed heating of the synthesis gel in the presence of isopropanol. Products were characterized using X-ray diffraction, scanning electron microscopy, N2 adsorption, ammonia temperature-programmed desorption, infrared spectroscopy of adsorbed pyridine, and 298i solid-state MAS NMR. The results indicated that the SAPO-11 sample synthesized by this method showed higher crystallinity, smaller particle size, and larger micropore volume than that prepared by the conventional hydrothermal method. Furthermore, the numbers of total acid sites and medium strength acid sites were also enhanced. In the hydroisomerization of n-tetradecane, the Pt/SAPO-11 catalyst thus exhibited high activity and selectivity for isomers.

关 键 词：SAPO-11分子筛 水热合成 异丙醇 程序升温 正十四烷 临氢异构 

分 类 号：O643.3[理学—物理化学]