Ruthenium supported on silicate and aluminosilicate mesoporous materials applied to selective sugar hydrogenation: Xylose to xylitol

German Araujo-Barahona, Nataliya Shcherban, Kari Eränen, Ivan Kopa, Igor Bezverkhyy, Mark Martínez-Klimov, Zuzana Vajglová, Atte Aho, Juan García-Serna, Tapio Salmi, Dmitry Yu Murzin

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Abstract

A series of ruthenium-based catalysts supported on a set of silicate and aluminosilicate mesoporous molecular sieves was synthesized and tested in xylose hydrogenation. The materials were characterized in terms of morphology, textural properties, acidity, as well as ruthenium loading, dispersion, and oxidation state. In general, the aluminosilicates-based catalysts displayed a higher activity compared to their respective silicate supports, which can be ascribed to a higher Ru content and dispersion, enhanced by a higher acidity. The most active synthesized catalyst (Ru/Al-MCM-4) displayed an improved performance compared to a commercial Ru/C catalyst due to a better xylitol selectivity. Two modelling approaches were implemented to describe the kinetic rate. The first model was based on the hypothesis that xylose molecules and hydrogen are adsorbed in different active sites on the catalyst surface, while the second model supposes the formation of an intermediate on the catalyst surface that reacts to form xylitol. Both models gave a very good description of the experimental data.

Original languageEnglish
Article number150019
Number of pages15
JournalChemical Engineering Journal
Volume485
DOIs
Publication statusPublished - 1 Apr 2024
MoE publication typeA1 Journal article-refereed

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