铝交联蒙脱土的IR骨架振动特征

IR FRAMEWORK VIBRATION FEATURE OF ALUMINIUM CROSS-LINKED MONTMORILLONITE

交联蒙脱土(Cross Linked Montmorillonite,简称CLM)是近年来引人瞩目的新型催化材料。它是类似分子筛的大孔层状化合物。关于它们的孔道结构、酸性及催化性能的研究已有不少报导,但就其IR骨架振动特征以及交联作用对其骨架振动影响的研究甚少。

Aluminium cioss-linked montmorillonile Al-CLM, and the ion exchanged (La)Al-CLM, (NH4)Al-CLM were prepared, and their IR framework vibration spectra after calcined at different temperatures were determined. It is found that the two strong double peak bands assigned to the tetrahedral layer Si-O vibra-tionS of the starting material Na-M move to higher frequencies obviously as Al-CLM, (La)Al-CLM, (NH4)Al-CLM arc formed and the calcination temperature laised. It rcveals that the quite strong chemical bonding reaction takes place between the tetrahedral layer of montmorillonite and the hydroxyl aluminium. At the same time, on the spectra of Al-CLM, (La)Al-CLM and (NH4)Al-CLM, the bands assigned to the octahedral layer vibration are weakened to some extent nd even disappear. This means that the octahcdral layer is also affected by increasing the calcination temperature.