摘要
采用水热合成法，由不同途径合成出晶粒大小不同的几种ＺＳＭ－５分子筛，这几种分子筛具有大致相同的硅铝比．采用ＮＨ３－ＴＧ－ＴＰＤ，Ｐｙｒｉｄｉｎｅ－ＩＲ－ＴＰＤ表征其酸性，用ＸＰＳ表征其外表面的硅铝比（体相的硅铝比用元素原子吸收法测定）．研究结果表明，应用导向剂可以合成出要求的晶粒大小而且粒度均匀；加晶种的合成得不到较大的晶体，粒度亦不均匀．分子筛的晶粒大小对其酸性有一定的影响，一般来讲，小晶粒分子筛的酸量多．本文中大晶粒分子筛的硅铝比基本上是不均匀的．
arious methods were employed to synthesize different crystal sizeZSM-5 zeolites. The NH3-TG-TPD and pyridine-IR-TPD, XPS measurements were used to characterize their acid properties and the distribution of SiO2/Al2O3. The results showed that the desired crystal sizezeolite could be synthesized by using the directing agent method; thecrystal size of zeolite had certain effects on the acid properties, theSiO2/Al2O3 distribution of large crystal size HZSM-5-4N synthesized inthis paper was probably not uniform.
关键词
ZSM-5分子筛
晶粒
合成
表征
ZSM-5 zeolite, zeolite synthesis, directing agent,crystal size
