Abstract
Zeolite beta was hydrothermally synthesized in the TEAOH–SiO 2–Al(0)–H 2O system in the absence of alkali cations. The effects of agitation under various TEAOH/SiO 2 molar ratios on the crystallization kinetics, particle size, particle size distribution, and framework SiO 2/Al 2O 3 of synthesized zeolite beta were studied. The as-synthesis and calcinated zeolites were characterized by XRD, TEM, N 2 adsorption. The effect of the agitation on the induction time, the particle size, and the framework SiO 2/Al 2O 3 ratio of the synthesized zeolites was more pronounced at high TEAOH/SiO 2 molar ratio (0.6) than at a low TEAOH/SiO 2 molar ratio (0.21 and 0.4). Under agitation, the induction time, the particle size, and the framework SiO 2/Al 2O 3 molar ratio of the zeolite greatly decreased with the increase of the TEAOH/SiO 2 ratio. While under the static state, the minimum induction time and the crystal particle size existed at TEAOH/SiO 2 ratio = 0.4, and the framework SiO 2/Al 2O 3 molar ratio of the zeolite increased with the increase of TEAOH/SiO 2 ratio. The crystallization proceeded via solution phase nucleation mechanism.
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