摘要
采用溶胶分散法合成了一系列高层间距(2.6nm)的羟基硅铝交联蒙托土(SiAl-CLM),并用^(27)Al NMR、XRD、DTA、XPS、吡啶吸附-IR、正丁胺吸附-TPD等技术进行了表征,用脉冲反应技术考察了其催化活性。结果表明:SiAl-CLM层间存在氧化硅胶团与羟基铝聚体形成的复合Si-Al柱.SiAl-CLM的热稳定性较好,对异丙苯的裂解活性(76.8％)较高。Si的引入增加了交联蒙托土的表面酸性,尤其增加了Bronsted酸性。
A series of hydroxyaluminosilicate cross-linked montmorillonites (Al-Si-CLM) with high basal spacing( 2. 6 nm) were prepared by the method of collosol dispersed for the first time. The pillaring structuer, thermal stability and surface acidity of the pillared clays were studied by 27Al NMR.XRD, DTA, IR, XPS, TPD. The results show that the thermal stability of the pillared clays was not changed by doping silicate, and the surface acidity, especially the Bronsted acid, was greatly increased. The cracking of cumene was carried out in a pulse reaction system at 400℃ over the pillared clays. Doping silicate increased cracking activity of cumene.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1992年第3期295-299,共5页
Chemical Journal of Chinese Universities
关键词
蒙托土
羟基硅铝交联
合成
表征
Cross-linked, Montmorillonite, Pillared clay, Synthesis, Characterization
