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Synthesis of cocrystallized USY/ZSM-5 zeolites from kaolin and its use as fluid catalytic cracking catalysts
Catalysis Science & Technology ( IF 5 ) Pub Date : 2017-12-11 00:00:00 , DOI: 10.1039/c7cy01477e
Yosra Ghrib 1, 2, 3, 4, 5 , Najoua Frini-Srasra 4, 5, 6 , Ezzeddine Srasra 4, 7, 8, 9, 10 , Joaquín Martínez-Triguero 11, 12, 13, 14 , Avelino Corma 11, 12, 13, 14
Affiliation  

A series of samples of cocrystallized USY/ZSM-5 zeolites were synthesized from kaolin and silica following a sequential two-step procedure with varying content of ZSM-5 (5–25 wt%). The presence of the ZSM-5 phases was confirmed by XRD and 29Si-NMR. The samples were stabilized by steaming and tested as FCC catalysts in the cracking of vacuum gasoil. The results obtained show that effectiveness of ZSM-5 as a propylene booster is enhanced when zeolites USY and ZSM-5 were synthesized in the same kaolin material, instead of using merely the physical mixtures of the two zeolites. This enhancement is attributed to the higher ability of ZSM-5 to crack larger olefins and suppress hydrogen-transfer to the gasoline fraction when the zeolites are grown together.

中文翻译:

高岭土合成共结晶USY / ZSM-5沸石及其在流化催化裂化催化剂中的应用

按照顺序的两步操作,以不同的ZSM-5含量(5–25 wt%)从高岭土和二氧化硅合成了一系列共结晶USY / ZSM-5沸石样品。通过XRD和29 Si-NMR证实了ZSM-5相的存在。通过蒸汽稳定样品,并在真空瓦斯油的裂化中作为FCC催化剂进行测试。所获得的结果表明,当在相同的高岭土材料中合成USY和ZSM-5沸石而不是仅使用两种沸石的物理混合物时,ZSM-5作为丙烯增强剂的有效性得到了提高。这种增强归因于ZSM-5具有更高的裂解较大的烯烃能力并抑制了沸石一起生长时氢转移至汽油馏分的能力。
更新日期:2017-12-11
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