甲醇氨化反应中交联皂石的催化行为

Catalytic Behaviour of Cross-linked Saponite in Dehydration- Amination of Methanol with Ammonia

层柱材料是具有规则孔结构且其表面酸性及孔结构可调变的固体酸催化剂.本文合成了皂石,并用十三聚铝羟基络离子(Al13)与其交联,在醇氨化反应中研究了此层柱材料孔结构及表面酸性与催化性能间的关系.

The pillared saponites were prepared by replacing the interlayer cation in the saponites synthesized by using hydrothermal method with [Al13O4(OH)24 (H2O)12]7+. The linkage mode of pillar with layer may be Al-O-Alp obtained by means of hydroxyl group condensition acom-panying the breaking of Si-O bond in the tetrahedral sheet according to the results of MAS NMR, XRD and chemical analysis. The dehydration-amination of methanol with ammonia was studied over the pillared saponites at 375 - 450℃ under ambient pressure. It is found that the methanol conversion and amine selectivity incresase with the acid amount on the surface of pillared saponite which is correlative with pillar density. The trimethylamine was suppressed with the increase of pillar density which is. correlative with the size and shape of pore structure. It means that the pillared saponite possesses the function of shape selectivity.