Effects of Recrystallization Parameters on the Formation of Hollow Silicalite-1 Zeolite

作者：Tan Cheng,Dong Zhuoya,Sun Tu,Zhang Yaping,Zhang Guanqun,Xia Changjiu,Ma Yanhang

摘要：Hollow silicalite-1 zeolite can be readily fabricated by hydrothermally treating the parent silicalite-1 with tetrapropylammonium hydroxide. A dissolution-recrystallization mechanism has been previously proposed to explain the formation of such hollow structures, but detailed information of this formation process still remains unclear. Herein, by tracking the evolvement of the hollow voids and morphology of the silicalite-1 under various treatments using XRD, SEM, TEM and N2 adsorption/desorption techniques, we systematically studied the formation process of the hollow structure of silicalite-1 zeolite and discovered that the organic template, water, treating temperature and time can significantly influence the morphology and size of hollow structure inside silicalite-1 zeolite crystals. Generally, a diluted synthesis medium with high template content under suitable temperature(for instance 170 °C) and extended treatment time favors the formation of single hexagonal hollow structure within silicalite-1 zeolites;while other conditions favor the formation of rounded hollow voids or even multiple-voids within silicalite-1 zeolites.

发文机构：Shanghai Advanced Research Institute School of Physical Science and Technology University of Chinese Academy of Sciences State Key Laboratory of Catalytic Materials and Reaction Engineering

关键词：HOLLOWSILICALITE-1HYDROTHERMALsynthesisdissolutionrecrystallization

分类号： O64[理学—物理化学][理学—化学]