Carbon supported polyoxometalates as recyclable solid acid catalysts in aqueous 
reactions

Hombach, Lea; Hausen, Nick; Manjon, Alba Garzon; Scheu, Christina; Kraffczyk, Hanna; Rose, Marcus; Albert, Jakob; Beine, Anna Katharina

doi:10.1016/j.apcata.2023.119392

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Carbon supported polyoxometalates as recyclable solid acid catalysts in aqueous reactions

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Hombach, Lea
Research Department Leitner, Max Planck Institute for Chemical Energy Conversion, Max Planck Society;

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Citation

Hombach, L., Hausen, N., Manjon, A. G., Scheu, C., Kraffczyk, H., Rose, M., et al. (2023). Carbon supported polyoxometalates as recyclable solid acid catalysts in aqueous reactions. Applied Catalysis A: General, (666): 119392, pp. 1-7. doi:10.1016/j.apcata.2023.119392.

Cite as: https://hdl.handle.net/21.11116/0000-000D-DCDA-6

Abstract

Acidic Polyoxometalates have been identified as promising catalysts for the hydrolysis of lignocellulosic biomass. They possess a high Bronsted acidity but are soluble in water and most organic solvents, which impedes their recycling and thus industrial application. To develop a solid acid catalyst with both good activity and recyclability, phosphotungstic acid (PTA) was immobilized on activated carbon (AC) by equilibrium impregnation. Characterization of the catalyst materials revealed a stabilizing effect by oxygen functional groups on the support material by increasing the polarity of the support and enabling a chemical interaction between the heteropolyacid and the surface. PTA/AC was applied in the hydrolysis of the hemicellulose xylan as an aqueous model reaction, selectively yielding the biorefinery platform compound xylose with up to 74 % yield. The catalyst can be easily separated from the reaction system and possesses good reusability over 20 recycling runs with a low constant leaching of 3-4 % per run.