Deactivation of Sn-Beta during carbohydrate conversion

Journal article (2018)

Authors

William N.P. van der Graaff Eindhoven University of Technology

Christiaan H.L. Tempelman Eindhoven University of Technology

Frank C. Hendriks Universiteit Utrecht

Javier Ruiz Martinez Universiteit Utrecht

Sara Bals Universiteit Antwerpen

Bert M. Weckhuysen Universiteit Utrecht

E.A. Pidko Eindhoven University of Technology

Evgeny A. Pidko Eindhoven University of Technology

Emiel J.M. Hensen Eindhoven University of Technology

Affiliation

External organisation

Flow chemistry Catalyst deactivation Zeolite catalysis Biomass conversion Confocal fluorescence microscopy Sn-Beta

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Published Date

2018

Language

English

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Affiliation

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Abstract

The deactivation of Sn-Beta zeolite catalyst during retro-aldolization and isomerization of glucose is investigated. Confocal fluorescence microscopy reveals that retro-aldolization of glucose in CH₃OH at 160 °C is accompanied with the build-up of insoluble oligomeric deposits in the micropores, resulting in a rapid catalyst deactivation. These deposits accumulate predominantly in the outer regions of the zeolite crystals, which points to mass transport limitations. Glucose isomerization in water is not only accompanied by the formation of insoluble deposits in the micropores, but also by the structural degradation of the zeolite due to desilication and destannation. Enhanced and sustained catalytic performance can be achieved by using ethanol/water mixtures as the reaction solvent instead of water.