Crystallization and morphology of zeolite MCM-22 influenced by various conditions in the static hydrothermal synthesis
作者： Yajing Wu , Xiaoqian Ren , Youdong Lu , Jun Wang
DOI: 10.1016/J.MICROMESO.2007.09.022
关键词: Molecular sieve 、 Induction period 、 Mineralogy 、 Chemical engineering 、 Materials science 、 Crystallinity 、 Hydrothermal circulation 、 Zeolite 、 Crystal 、 Crystallization 、 Hydrothermal synthesis
摘要: MCM-22 zeolite was synthesized in various static hydrothermal systems with hexamethyleneimine (HMI) as the structure-directing agent. Synthesis parameters, such silica source, alkaline source (Na+, K+ or NH4+), alkalinity of reaction mixture, HMI/SiO2 ratio and seeding, were changed to investigate their effects on crystallization morphology MCM-22. The produced samples characterized by XRD, IR, SEM, N2 physisorption ICP. Reaction conditions revealed influence induction period rate remarkably, sodium metasilicate medium OH−/SiO2 molar (0.15), high addition seeding could accelerate crystallization. Moreover, altering morphologies product different particle sizes achieved, spherical, rose-like, doughnut-like platelet-like structures. noteworthy observation that instead Na+, a much shorter faster obtained, resulting higher crystallinity smaller crystal size. is more favorable formation than Na+ even at very low ratios.
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