摘要
用蒙皂土和Johansson离子交联剂,通过离子交换方法,可制备出Al-CLS——一种大孔结构的催化材料。用红外、X-射线衍射、差热分析、热重分析、BET比表面分析等方法考察了影响Al-CLS热稳定性的各种因素。实验结果证明,层结构的热稳定性是影响Al-CLS整体结构热稳定性的主要因素。原因是Al-CLS的结构羟基易于因热运动而丢失,最后将导致土板结构的解体。层结构羟基丢失的难易程度与交联度有关。层间某些金属阳离子,在热运动条件下可向层结构内迁移,并填补因丢失结构羟基而留下的晶格空穴,使土板的结构稳定性得到改善。
The aluminum cross-linked smectite(Al-CLS)was prepared from montmorillonite by interlayering with aluminium hydroxyl cation(Johansson ion).Since the basal spacing of montmorillonite is enlarged, Al-CLS can be used as a kind of large pore catalytic material. The factors affecting the thermal stability of Al-CLS were studied by IR, XRD, DTA, TG and BET surface area methods. The results indicate that the thermal stability of Al-CLS mainly depends on the thermal stability of layer structure of original clay material.The loss of structural hydroxyls during thermal treatment may cause lattice defect and consequently, the collapse of clay struture. The amount of structural hydroxyl loss can be correlated with the crosslinking degree of AL-CLS. Some balaning cations in interlayer space of clay may migrate into octahedral sheet to fill the vacancy caused by the loss of structural hydroxyls, thus enhance the stability of layer structure.
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
1991年第2期135-142,共8页
Journal of Fuel Chemistry and Technology
关键词
铝交联蒙皂土
蒙皂土
分子筛
montmorillonite
aluminium interlayeral
structure
stability
