High silica SSZ-13 zeolite was synthesized by an efficient and green steam-assisted crystallization (SAC) method under a low alkalinity and low organic templates amount system. The as-prepared samples were characterized by XRD, SEM, N₂ adsorption–desorption, TG–DTG and NH₃-TPD. The results showed that the SAC method can not only remarkably improve zeolite yield but also enhance the crystallization rate of SSZ-13 zeolite compare to conventional hydrothermal route. Meanwhile, it was also found that the various content of the organic structure directing agent (N,N,N-trimethyladamantammonium hydroxide, TMAdaOH) in the dry gel can adjust flexibly the crystal size, morphology and acidity of samples. The zeolite samples with smaller particles and more strong acidity amount were more likely obtained under the higher TMAdaOH/SiO₂ ratio (0.2) condition. In addition, the catalytic evaluation in methanol-to-olefins (MTO) reaction showed that the high silica SSZ-13 catalysts synthesized by SAC method exhibited longer lifetime and comparative selectivity to ethylene and propene than those of the SSZ-13s obtained by conventional hydrothermal route. Thus, the SAC route is believed to be a competitive strategy to synthesize high silica SSZ-13 zeolites with improved MTO catalytic performance.

中文翻译：

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通过蒸汽辅助结晶工艺高效合成高硅SSZ-13沸石

在低碱度和低有机模板量体系下，通过高效的绿色蒸汽辅助结晶（SAC）方法合成了高硅含量的SSZ-13沸石。制备的样品通过XRD，SEM，N ₂吸附-解吸，TG-DTG和NH _3进行表征。-TPD。结果表明，与常规水热法相比，SAC法不仅可以显着提高沸石的收率，而且可以提高SSZ-13沸石的结晶速率。同时，还发现干凝胶中有机结构导向剂（N，N，N-三甲基金刚烷铵，TMAdaOH）的各种含量可以灵活地调节样品的晶体尺寸，形态和酸度。在较高的TMAdaOH / SiO ₂下，更可能获得具有较小颗粒和更强酸度的沸石样品比率（0.2）条件。此外，在甲醇制烯烃（MTO）反应中的催化评估表明，与传统水热法制得的SSZ-13相比，通过SAC方法合成的高二氧化硅SSZ-13催化剂具有更长的寿命以及对乙烯和丙烯的相对选择性。路线。因此，SAC路线被认为是合成具有改进的MTO催化性能的高二氧化硅SSZ-13沸石的竞争策略。