Effect of agitation on the synthesis of zeolite beta and its synthesis mechanism in absence of alkali cations
Effect of agitation on the synthesis of zeolite beta and its synthesis mechanism in absence of alkali cations
复制标题
DOI：
10.1016/j.micromeso.2006.03.010
复制
发表时间：
2006-09
影响因子：
5.2
通讯作者：
Lianhui Ding;Ying Zheng;Zisheng Zhang;Z. Ring;Jinwen Chen
中科院分区：
文献类型：
--
作者：
Lianhui Ding;Ying Zheng;Zisheng Zhang;Z. Ring;Jinwen Chen
在TEAOH-SiO 2-Al（0）-H2O体系中，在无碱金属离子存在下，水热合成了β沸石。研究了不同TEAOH/SiO2摩尔比下搅拌对合成β沸石晶化动力学、粒度、粒度分布和骨架SiO2/Al 2 O3的影响。采用XRD、TEM、N2吸附等手段对合成前后的沸石进行了表征。在高TEAOH/SiO2摩尔比（0.6）时，搅拌对诱导时间、颗粒尺寸和骨架SiO2/Al 2 O3比的影响比低TEAOH/SiO2摩尔比（0.21和0.4）时更为明显。在搅拌条件下，随着TEAOH/SiO2比的增加，沸石的诱导时间、粒径和骨架SiO2/Al 2 O3摩尔比均显著减小。静态下，当TEAOH/SiO2 =0.4时，诱导时间和晶粒尺寸最小，沸石骨架SiO2/Al 2 O3摩尔比随TEAOH/SiO2的增加而增加。晶化通过溶液相成核机制进行。
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/SiO2molar ratios on the crystallization kinetics, particle size, particle size distribution, and framework SiO2/Al2O3of synthesized zeolite beta were studied. The as-synthesis and calcinated zeolites were characterized by XRD, TEM, N2adsorption. The effect of the agitation on the induction time, the particle size, and the framework SiO2/Al2O3ratio of the synthesized zeolites was more pronounced at high TEAOH/SiO2molar ratio (0.6) than at a low TEAOH/SiO2molar ratio (0.21 and 0.4). Under agitation, the induction time, the particle size, and the framework SiO2/Al2O3molar ratio of the zeolite greatly decreased with the increase of the TEAOH/SiO2ratio. While under the static state, the minimum induction time and the crystal particle size existed at TEAOH/SiO2ratio=0.4, and the framework SiO2/Al2O3molar ratio of the zeolite increased with the increase of TEAOH/SiO2ratio. The crystallization proceeded via solution phase nucleation mechanism.