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Synthesis of cocrystallized USY/ZSM-5 zeolites from kaolin and its use as fluid catalytic cracking catalysts

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Abstract

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.

Graphical abstract: Synthesis of cocrystallized USY/ZSM-5 zeolites from kaolin and its use as fluid catalytic cracking catalysts

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Publication details

The article was received on 21 Jul 2017, accepted on 10 Dec 2017 and first published on 11 Dec 2017


Article type: Paper
DOI: 10.1039/C7CY01477E
Citation: Catal. Sci. Technol., 2018, Advance Article
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    Synthesis of cocrystallized USY/ZSM-5 zeolites from kaolin and its use as fluid catalytic cracking catalysts

    Y. Ghrib, N. Frini-Srasra, E. Srasra, J. Martínez-Triguero and A. Corma, Catal. Sci. Technol., 2018, Advance Article , DOI: 10.1039/C7CY01477E

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