偏高岭土基地质聚合物原位水热合成P型沸石分子筛的研究

Researches on preparation of zeolite P from metakaolin-based geopolymers via in-situ hydrothermal method

本文以偏高岭土基地质聚合物(SiO_2/Al_2O_3=3.2)为基体,通过水热合成法将其原位转化成P型沸石分子筛。研究水热温度、NaOH浓度及水热时间对P型沸石分子筛的结晶程度及形貌的影响,得到偏高岭土基地质聚合物原位合成P型沸石分子筛的适宜条件为:水热温度100℃,NaOH浓度2.0 mol/L,水热时间24 h。该法工艺简单,环境友好,可控成型。在此方法的基础上通过改变原材料和反应条件,可以合成其他类型的沸石分子筛。

Zeolite P was synthesized via in-situ hydrothermal method with metakaolin-based geopolymer （SiO2/Al2O3=3.2） as a staring material. The major factors influencing the crystallization and morphology of Zeolite P were investigated in the aspects of hydrothermal temperature,concentration of sodium hydroxide solution and hydrothermal time.The results showed that zeolite P was successfully transformed from metakaolin-based geopolymer at 100℃ curing for 24 h in the sodium hydroxide solution of 2.0 mol/L.Being simple, environment-friendly and controllable,the in-situ hydrothermal method is expected to be used to synthesize other zeolites by changing the raw material compositions and reaction conditions.