期刊
MATERIALS CHEMISTRY AND PHYSICS
卷 123, 期 2-3, 页码 507-509出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2010.05.005
关键词
SAPO-34; Nanocrystals; Dry gel conversion
SAPO-34 nanocrystals were synthesized by a dry gel conversion method using tetraethylammonium hydroxide as a structure-directing agent. The crystal growth of SAPO-34 was studied by X-ray diffraction and field-emission scanning electron microscopy. After 3 h, 45-nm SAPO-34 crystals with an amorphous phase were observed. The crystal size increased to 70 nm after 6 h, but did not increase greatly thereafter. The average crystal size of the final product was 75 nm. The nucleation density for SAPO-34 crystals in dry gel conversion appeared to be much higher than that under hydrothermal conditions, resulting in the formation of small crystals. (C) 2010 Elsevier B.V. All rights reserved.
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