摘要
Non-seeded ultrafast microwave synthesis of all-silica DDR zeolite was realized using 1-adamantane amine and tetraethylammonium hydroxide. XRD, SEM, NMR, FT-IR, TGA and nitrogen adsorption were used to characterize the obtained samples. The presence of TEAOH suppressed the formation of other phases which allowed the synthesis to be carried out at high temperature. High quality DDR crystals were obtained in only 30 min without seeding, which is the fastest synthesis up to now. 1-Adam serves as template for zeolite DDR and TEAOH is not occluded in zeolite channels. The ultra fast synthesis is the synergy of fast heating from microwave energy, fast kinetics (nucleation and crystallization) at high temperature and phase selectivity from the TEAOH. The obtained DDR crystals have similar properties as those prepared with traditional method. (C) 2016 Elsevier Inc. All rights reserved.
