A series of cost-effective aluminum-rich chabazite (Al-rich CHA) zeolites with improved textural properties has been synthesized without using templates. Herein, we report a detailed synthesis of CHA zeolite without using organic structure directing agent (OSDA-free). Pure CHA zeolites were successfully synthesized under different gel compositions. The prepared CHA samples were characterized using different characterization techniques. The crystallinity, the textural properties, the morphology and the acidity were characterized using X-ray diffraction (XRD), nitrogen physisorption, field-emission scanning electron microscopy (SEM) and ammonium temperature programing desorption (NH₃-TPD), accordingly. The ion-exchange enhanced the surface area from around 1 m²/g to around 485 m²/g. Aging time had a significant influence on the crystallization rate and morphology. The H-form of the synthesized CHA zeolite was evaluated in the conversion of methanol-to-olefin (MTO) at different reaction temperatures. Conversion was maintained 100% for 4 h at 350 °C and then life-time was decreased with the increase of temperature. The selectivity to lower olefins was correlated to the reaction temperature and time on stream (TOS). The highest olefins selectivity was ca. 93.8 at TOS and reaction temperature of 180 min and 350 °C, respectively.

在不使用模板的情况下，已经合成了一系列具有改善的织构特性的具有成本效益的富铝菱沸石（Al- CHA）沸石。在此，我们报告了不使用有机结构定向剂（​​不含OSDA）的CHA沸石的详细合成方法。在不同的凝胶组成下，成功地合成了纯CHA沸石。使用不同的表征技术对制备的CHA样品进行表征。相应地，使用X射线衍射（XRD），氮物理吸附，场发射扫描电子显微镜（SEM）和铵温度程序解吸（NH ₃ -TPD）表征了结晶度，织构性质，形态和酸度。离子交换将表面积从大约1 m ² / g增加到大约485 m² /克。时效时间对结晶速率和形态有重要影响。在不同的反应温度下，通过甲醇至烯烃（MTO）的转化率评估了合成的CHA沸石的H型。在350°C下保持100％的转化率4小时，然后随着温度的升高寿命缩短。低级烯烃的选择性与反应温度和生产时间（TOS）相关。最高的烯烃选择性为约。在TOS和反应温度分别为180分钟和350°C时为93.8。