水热法合成4A沸石的相变/纳米聚合生长过程及其机理研究

用廉价的硅铝系渣料为原料,通过水热法合成了4A沸石,根据不同时间的晶化反 应产物,用XRD、SEM等表征手段对4A沸石的形成机理及晶体长大过程进行了研究,结果 表明:①该反应过程的机理属前驱体固相→硅酸根或铝酸根液相→P型沸石晶相→P型沸石 向A型沸石的相变→A型沸石向P型沸石逆相变;②4A沸石晶体的长大是通过纳米聚合生 长的结果.

Phase Transition/Nano Aggregation Growth Process of Zeolite 4A Prepared by Hydrothermal Synthesis and Its Mechanism

Zeolite 4A was prepared successfully by hydrothermal synthesis, using cheap Si-Al slag as raw materials. Formation mechanism of 4A zeolite and crystal growth process were studied by some characterized measurements, such as XRD, SEM etc, based on crystallized productions at different reaction time. The results indicate that (1) the reaction mechanism of the process is precursors state phase→SiO₃^2-or AlO₂^- liqulid phase→zeolite P crystallization phase→phase transition from zeolite P to zeolite 4A→reversible phase transition from zeolite 4A to zeolite P; (2) zeolite 4A growth is the results of nano aggregation growth.