Abstract: Mixed molecular sieves composing of SAPO-34 and HZSM-5 under different ratios are prepared by mechanically mixing method,and their catalytic performance in methanol to olefins (MTO) reaction are investigated.These samples are characterized by various techniques such as XRD,SEM,FT-IR,BET and NH3-TPD.The results show that some small HZSM-5 particles adhere to the surface of SAPO-34 particles with a large size,the physical mixture of SAPO-34 and HZSM-5 can adjust the acidity and pore structure of the catalyst,which helps to improve the catalytic performance of the catalyst in the MTO process.Catalytic test results show that the mixed catalysts exhibit longer lifetime and excellent selectivity for propylene.After the reaction has carried out for 20 hours over MSZ-90% mixed molecular sieves,the selectivity of propylene reaches as high as 48.9% and the production ratio between propylene and ethylene ratio is 4.0.
徐文鹏, 苏蛟蛟, 韩丽, 徐军. SAPO-34和HZSM-5机械混合分子筛在甲醇制丙烯反应中的应用[J]. 现代化工, 2020, 40(10): 86-90.
XU Wen-peng, SU Jiao-jiao, HAN Li, XU Jun. Application of mechanically-mixed SAPO-34/HZSM-5 molecular sieves in methanol to propylene. Modern Chemical Industry, 2020, 40(10): 86-90.
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