热及水热处理对SAPO-5分子筛结构的影响  

EFFECT OF THERMAL AND HYDROTHERMAL TREATMENTS ON STRUCTURE OF SAPO5 MOLECULAR SIEVE

作　　者：肖天存[1] 王海涛[1] 安立敦[2] 王弘立[2] 

机构地区：[1]山东大学环境工程系 [2]中国科学院兰州化学物理研究所

出　　处：《催化学报》1997年第6期483-487,共5页

基　　金：中国科学院武汉物理研究所波谱国家重点实验室资助

摘　　要：对合成的ＳＡＰＯ５分子筛进行了高温和水热处理，并用ＩＲ，ＸＲＤ和ＭＡＳＮＭＲ对处理过的分子筛进行了表征．结果表明，短时间的高温焙烧并不破坏分子筛的结构，而使分子筛中的骨架元素Ｐ，Ａｌ和Ｓｉ发生重构；长时间的高温焙烧使分子筛的结晶度降低，主要是由于Ｐ和Ａｌ游离出分子筛的骨架而形成磷酸铝盐．水热处理使分子筛中的Ｓｉ经历一个转晶和重构过程，在使ＳＡＰＯ５分子筛结构更加完整的同时，未完全结晶的杂质形成了少量的鳞英石颗粒．SAPO_5 molecular sieve is synthesized and treated with calcination and steam at different temperatures. IR, XRD and MAS NMR are used to characterize the structure changes of the treated molecular sieve samples. The results show that calcination at high temperature for a short time can not break the structure of SAPO5, but it makes the framework element of Al, Si, and P rearrange. However, calcination at high temperature for a long time decreases the crystallinity, owing to that some framework elements (Al and P) leave its framework position and form aluminum phosphate. Hydrothermal treatment makes Si atoms in the synthesized sample experience a crystaltransformation and reconstruction, and promote some impurity to yield aphrite while improving the crystallinity of SAPO_5.

关 键 词：热处理 水热处理 SAPO-5 分子筛 改性 

分 类 号：O643.36[理学—物理化学]