Abstract Zeolite beta with high crystallinity has been successfully synthesized by using kenyaite conversion method with seed crystals under hydrothermal treatment at 125 °C for 36 h. The OSDA-free synthesis of zeolite beta could be obtained from the mixture composition of 0.96 NaOH: SiO2: 0.0167 Al2O3: 180 H2O by adding 25 wt % seeds. To study the crystallization behaviours and the medium-range structure changes during the conversion process, the prepared zeolite beta was characterized by powder X-ray diffraction, field-emission scanning electron microscope, Fourier transform infrared spectroscopy, energy dispersive spectroscopy, solid-state 27Al MAS and 29Si MAS NMR spectroscopy. The growth of zeolite beta happened on the surface of kenyaite. The five-membered rings and six-membered rings in kenyaite were partly preserved and the four-membered rings were formed by the connection of five-membered rings during the crystallization process. Meanwhile, the effects of reaction time, the initial mixture composition, the quantity of beta seed crystals and temperature in the synthesis were investigated. The as-synthesized zeolite beta, with relatively high thermal stability, exhibits good catalytic performance in the cyclohexanol dehydration reaction system.

中文翻译：

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在晶种存在的情况下，肯尼亚石的无 OSDA 水热转化为沸石 β

摘要 采用肯尼亚石转化法与晶种在125 ℃水热处理36 h，成功合成了高结晶度β沸石。通过添加 25 wt% 的晶种，可以从 0.96 NaOH: SiO2: 0.0167 Al2O3: 180 H2O 的混合物组成中获得无 OSDA 的沸石 β 合成。为了研究转化过程中的结晶行为和中程结构变化，制备的β沸石通过粉末X射线衍射、场发射扫描电子显微镜、傅里叶变换红外光谱、能量色散光谱、固态27Al进行表征。 MAS 和 29Si MAS 核磁共振光谱。沸石β的生长发生在肯雅石表面。肯雅石中的五元环和六元环被部分保留，四元环是由五元环在结晶过程中连接形成的。同时，研究了反应时间、初始混合物组成、β晶种数量和温度对合成的影响。合成的β沸石具有较高的热稳定性，在环己醇脱水反应体系中表现出良好的催化性能。