Silicoaluminophosphates (SAPOs) with different pore structures were synthesized through the implementation of polyethylene glycol (PEG) as a mesopores impregnation agent. Using PEGs with different molecular weights (MWs) and concentrations in the synthesis precursor, several samples were synthesized and characterized. Applying a PEG capping agent to the precursors led to the formation of tuned mesopores within the microporous matrix of the SAPO. The effects of the PEG molecular weight and PEG/Al molar ratio were investigated to maximize the efficiency of the catalyst in the methanol-to-olefin (MTO) process. Using PEG with a MW of 6000 resulted in the formation of both Zeolite Rho and chabazite structural frameworks (i.e., DNL-6 and SAPO-34). Pure SAPO-34 samples were successfully prepared using PEG with a MW of 4000. Our results showed that the PEG concentrations affect the porosity and acidity of the synthesized materials. Furthermore, the SAPO-34 sample synthesized with PEG (MW of 4000) and a PEG/Al molar ratio of 0.0125 showed a superior catalytic stability in the MTO reaction owing to the tuned bi-modal porosity and tailored acidity pattern. Finally, through reactivation experiments, it was found that the catalyst is stable even after several regeneration cycles.

通过将聚乙二醇（PEG）用作中孔浸渍剂，合成了具有不同孔结构的硅铝磷酸盐（SAPO）。使用在合成前体中具有不同分子量（MWs）和浓度的PEG，合成并表征了几个样品。将PEG封端剂应用于前体导致在SAPO的微孔基质内形成调节的中孔。研究了PEG分子量和PEG / Al摩尔比的影响，以最大程度地提高甲醇制烯烃（MTO）工艺中催化剂的效率。使用分子量为6000的PEG导致形成了Zeolite Rho和菱沸石结构骨架（即DNL-6和SAPO-34）。使用分子量为4000的PEG成功制备了纯SAPO-34样品。我们的结果表明，PEG浓度会影响合成材料的孔隙率和酸度。此外，归因于双峰孔隙率和定制的酸度模式，用PEG（分子量为4000）和PEG / Al摩尔比为0.0125合成的SAPO-34样品在MTO反应中显示出优异的催化稳定性。最后，通过再活化实验，发现即使在几个再生循环后，催化剂也是稳定的。