Issue 12, 2019

Hierarchical MFI type zeolites with intracrystalline macropores: the effect of the macropore size on the deactivation behaviour in the MTO reaction

Abstract

Hierarchically structured ZSM-5 catalysts have been prepared using different sized mesoporous silica particles as the sacrificial template, resulting in zeolite crystals with different sized intracrystalline macropores but very similar zeolitic characteristics such as crystallinity, chemical composition, and acidic and textural properties. This set of catalysts was used to investigate the effect of intracrystalline macropores on the deactivation behaviour of ZSM-5 catalysts in the conversion of methanol to olefins (MTO). The catalytic tests showed that the incorporation of macropores was very beneficial in improving the catalyst lifetime in the MTO reaction. This improved performance was correlated to the reduced coke formation during the reaction, likely a result of the enhanced transport of reactants and products in the zeolite crystals due to the well-interconnected macropores. Also worth mentioning is the effect of the dimensions of the additional macropores on the rate of coke formation. Increasing the macropore size by a factor of two led to a decrease in coke formation and consequently a two times longer catalyst lifetime.

Graphical abstract: Hierarchical MFI type zeolites with intracrystalline macropores: the effect of the macropore size on the deactivation behaviour in the MTO reaction

Supplementary files

Article information

Article type
Paper
Submitted
22 Feb 2019
Accepted
20 May 2019
First published
21 May 2019

Catal. Sci. Technol., 2019,9, 3259-3269

Hierarchical MFI type zeolites with intracrystalline macropores: the effect of the macropore size on the deactivation behaviour in the MTO reaction

T. Weissenberger, B. Reiprich, A. G. F. Machoke, K. Klühspies, J. Bauer, R. Dotzel, J. L. Casci and W. Schwieger, Catal. Sci. Technol., 2019, 9, 3259 DOI: 10.1039/C9CY00368A

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