摘要
在强碱性低温常压条件下，以正硅酸四乙酯为 硅源， 硫酸铝为铝源，十二胺为 模板剂合成出纯硅 Ｓｉ － Ｈ Ｍ Ｓ 和硅铝 Ａｌ － Ｈ Ｍ Ｓ 分子筛，并用粉末 Ｘ 射线衍射（ Ｘ Ｒ Ｄ） 、付立叶变换红外光谱（ Ｆ Ｔ－ Ｉ Ｒ） 、透射电子显微镜（ Ｔ Ｅ Ｍ） 等手段进行了表征。 Ｘ Ｒ Ｄ 谱图显示，强碱性条件下得到的 Ｓｉ － Ｈ Ｍ Ｓ 和 Ａｌ － Ｈ Ｍ Ｓ 分子筛的晶体结构比较规整，具有层状晶体结构，各衍射峰分别归属于１００ ，２００ ，３００ 等衍射。 Ｆ Ｔ－ Ｉ Ｒ 谱图显示铝元素进入了 Ａｌ－ Ｈ Ｍ Ｓ 分子筛骨架。提出强碱性条件下 Ｈ Ｍ Ｓ 分子 筛是通过“ Ｓ０ Ｉ－ Ｎａ ＋ ”路线形成的。使用十八水合硫酸铝作为合成 Ａｌ － Ｈ Ｍ Ｓ 分子筛的铝源，与 使用昂贵的三 异丙氧基铝［ Ａｌ（ Ｏ Ｐｒｉ） ３］ 为 铝源相比，具有原料价廉易得的特点。
Silicate mesoporous molecular sieve Si-HMS and aluminosilicate molecular sieve Al-HMS were synthesized in alkaline condition(pH=14) with Al 2(SO 4)·18H 2O as aluminium source at low temperature and ambient pressure,in which tetraethylorthosilicate(TEOS) was silicon source and dodecylamine was template.Si-HMS and Al-HMS molecular sieves were characterized by XRD, FT-IR and TEM techniques. X-ray diffractograms of HMS molecular sieves prepared in alkaline condition presented 2～4 peaks with a strong peak at a low angle ( d 100 reflection line) and 1～3 wealer peaks at higher angles (200, 300 reflection lines, et al.). Si-HMS and Al-HMS molecular sieves synthesized in alkaline condition had regular crystal structure and showed lamellar crystal structure. FT-IR spectra showed that aluminium had incorporated into the framework of Al-HMS molecular sieves. The S 0I -Na + templating pathway was proposed in detail. As aluminium source to synthcsise Al-HMS molecular sieve, comparing with expensive Al(OPr i ) 3, the Al 2(SO 4)·18H 2O is cheaper and more available.
出处
《石油化工高等学校学报》
CAS
1999年第3期31-34,42,共5页
Journal of Petrochemical Universities
基金
辽宁省自然科学基金
