GeAPSO-34 molecular sieves were successfully synthesized with various Ge stoichiometries and used as catalysts in the conversion of methanol to olefins (MTO). The XRD and SEM characterizations proved that the presence of Ge species in the initial gel could accelerate the nucleation and crystallization of the zeolites. The XRD and XRF results indicated that the Ge element has been incorporated into the CHA frame structure of GeAPSO-34. NH₃-TPD results showed relatively weak acidity and less acid sites for Ge-incorporated samples. Compared with SAPO-34, GeAPSO-34 showed improved light olefins selectivity in MTO reaction.

中文翻译：

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GeAPSO-34分子筛：合成，表征和甲醇制烯烃性能

GeAPSO-34分子筛成功地合成了各种化学计量比的Ge，并用作甲醇转化为烯烃（MTO）的催化剂。XRD和SEM表征证明，初始凝胶中Ge物种的存在可以促进沸石的成核和结晶。XRD和XRF结果表明Ge元素已被并入GeAPSO-34的CHA框架结构中。NH ₃ -TPD结果显示，掺Ge的样品酸度相对较弱，且酸位较低。与SAPO-34相比，GeAPSO-34在MTO反应中显示出改善的轻烯烃选择性。