期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 109, 期 1-3, 页码 542-548出版社
ELSEVIER
DOI: 10.1016/j.micromeso.2007.06.002
关键词
NaP; phase-purity; microwave-assisted synthesis; gel alkalinity; morphology
Applying microwave heating, crystallization of NaP without by-products could be achieved from synthesis gel compositions typically resulting in MCM-22 formation under thermal heating. Adjusting the alkalinity of Na/SiO2 to 1.17, and the synthesis time to 5 h, zeolite NaP (Na4.5Al4.5Si11.5O32 center dot 9.9H(2)O) was the main product (91%) with analcime (9%) as by-phase. Phase-pure zeolite NaP was obtained from a gel composed of 60 Na2O: Al2O3:103SiO(2):4500H(2)O with and without hexamethylenediimine (HMI) template under microwave heating at 140 degrees C for 3 h. Formation of crystalline MCM-22 was not observed. Characterization methods comprised chemical analysis (ICP-OES), XRD, thermal analysis (TG/DTA), Al-27 as well as Si-29 MAS NMR spectroscopy, and electron microscopy (SEM). (c) 2007 Elsevier Inc. All rights reserved.
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