SAPO-34 is highly selective and hydrothermally stable for MTO reactions but it is rapidly deactivated by the formation of coke through its micropores. The promising SAPO-34/ZSM-5 nanocomposite catalyst with a different ratio was synthesized by the ultrasonic-assisted hydrothermal method and it obtained products that were characterized to further investigate their catalytic performance. Utilization of the ultrasound method led to a faster synthesis time, a decrease of crystallite size, an increase of surface area, and a dominant mesopore structure. The physicochemical properties of the product were extensively investigated by XRD, FESEM, TEM, FT-IR, N₂ adsorption–desorption techniques, and NH₃-TPD. Results indicate that the composite had high conversion and selectivity compared to that of the original ZSM-5 and SAPO-34. When composite structures due to the synergic effect between ZSM-5 and SAPO-34 acted as promoted catalysts, they improved catalytic properties of composite catalysts. Moreover, the SAPO-34/ZSM-5 nanocomposite catalyst with 50% ratio synthesized by the ultrasonic-assisted hydrothermal method (U–S/Z (50%)) showed 100% conversion and 90% selectivity to light olefin at 450 °C.

中文翻译：

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超声在快速合成SAPO34 / ZSM-5纳米复合物中的有益应用及其对MTO反应的催化性能

SAPO-34对MTO反应具有很高的选择性和水热稳定性，但通过其微孔形成的焦炭使其迅速失活。通过超声辅助水热法合成了具有前景的具有不同比例的SAPO-34 / ZSM-5纳米复合催化剂，并获得了可以进一步研究其催化性能的产物。超声方法的使用导致更快的合成时间，微晶尺寸的减小，表面积的增加以及主要的中孔结构。通过XRD，FESEM，TEM，FT-IR，N ₂吸附-解吸技术和NH ₃对该产品的理化性质进行了广泛的研究。-TPD。结果表明，与原始ZSM-5和SAPO-34相比，该复合材料具有较高的转化率和选择性。当由于ZSM-5和SAPO-34之间的协同作用而形成的复合结构充当助催化剂时，它们改善了复合催化剂的催化性能。此外，通过超声辅助水热法合成的SAPO-34 / ZSM-5纳米复合催化剂，其50％的比例（U-S / Z（50％））在450°C时显示出100％的转化率和90％的轻烯烃选择性。