کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
77283 | 49162 | 2006 | 8 صفحه PDF | دانلود رایگان |
Zeolite beta was hydrothermally synthesized in the TEAOH–SiO2–Al(0)–H2O system in the absence of alkali cations. The effects of agitation under various TEAOH/SiO2 molar ratios on the crystallization kinetics, particle size, particle size distribution, and framework SiO2/Al2O3 of synthesized zeolite beta were studied. The as-synthesis and calcinated zeolites were characterized by XRD, TEM, N2 adsorption. The effect of the agitation on the induction time, the particle size, and the framework SiO2/Al2O3 ratio of the synthesized zeolites was more pronounced at high TEAOH/SiO2 molar ratio (0.6) than at a low TEAOH/SiO2 molar ratio (0.21 and 0.4). Under agitation, the induction time, the particle size, and the framework SiO2/Al2O3 molar ratio of the zeolite greatly decreased with the increase of the TEAOH/SiO2 ratio. While under the static state, the minimum induction time and the crystal particle size existed at TEAOH/SiO2 ratio = 0.4, and the framework SiO2/Al2O3 molar ratio of the zeolite increased with the increase of TEAOH/SiO2 ratio. The crystallization proceeded via solution phase nucleation mechanism.
Journal: Microporous and Mesoporous Materials - Volume 94, Issues 1–3, 8 September 2006, Pages 1–8