羟基硅铝交联粘土的合成和热稳定性研究

羟基硅铝交联粘土的合成和热稳定性研究孙来生，李栋藩，陶龙骧（中国科学院大连化学物理研究所，大连１１６０２３）关键词蒙脱土，硅铝柱，热稳定性，~（２７）Ａｌ　ＮＭＲ交联粘土作为一种新型催化材料出现以来，其热稳定性一直是重要研究课题，对影响交联粘土热稳定?..

SYNTHESIS AND THERMAL STABILITY OF THE HYDROXYL-SiAl CROSS-LINKED MONTMORILLONITE

he hydroxyl-SiAl and hydroxyl-Al cross-linked montmorillonite(CLM) were prepared. The results of 27Al NMR and XRD show thatpillars of SiAl-CLM are the Al13]7+ cores combined with the outsidesilica. The higher thermal stability of SiAl-CLM is due to the enhancedcapability for holding protons by StAl pillars and reduced number ofprotons migrated to the octahedral layer during pillars dehydroxylation,it brings about the enhancement of interaction between the pillars andthe montmorillonite layer. The SiO. in tetrahedral sheets of montmorillonite is inverted by high temperature calcination and the formation of St-O-Si bond between the outside silica of StAl pillars and the invertedtetrahedral sheets also improves the thermal stability of SiAl-CLM.