Surface Acidity Determination of Multi-metal Complex Cross-Linked Montmorillonite

The surface acidity of a series of cross-linked montmorillonite were determined by NH_3-TPD.The effect of preparation methods and calcined temperature on the acidity of cross-linked montmorillonite have been studied. The results show that the acidity of montmorillonite increased after cross-linking and it is improved after the cross-linked montmorillonite were calcined (the optimum temperature is 400 ℃);and the suitable method is mixing and the acidity of montmorillonite increased after Ni~(2+) were introduced into the interlayer of montmorillinote.