用正己胺预支撑层状镧铌酸,以3-丙氨基三乙氧基硅烷为硅源,将其水解后形成的硅聚合体粒子插入到镧铌酸的层间,经焙烧后制成氧化硅柱支撑的多孔性镧铌酸催化剂. 它的层间通道高度约0.52 nm,比表面积从柱撑前的5 m2/g增大到109 m2/g. 镧铌酸比表面积的显著增大,主要是由氧化硅柱撑后形成的层间狭缝状微孔孔道所提供的. 充分暴露的层间内表面使镧铌酸的酸催化性能得到大幅度改善,对异丙醇脱水的催化活性从未支撑时的32.0%提高到柱撑后的73.9%. 此催化剂的层状结构可保持到700 ℃以上,是一热稳定的多孔性层柱材料. 在催化剂制备过程中,柱化液浓度和回流反应时间对层柱材料的多孔性具有较大的影响,进而影响其酸催化活性,但这些因素不能显著改变材料的层间通道高度.
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