Insights into the selective hydrogenation of levulinic acid to 
gamma-valerolactone using supported mono- and bimetallic catalysts

Al-Naji, Majd; Yepez, Alfonso; Balu, Alina M.; Romero, Antonio A.; Chen, Zhihao; Wilde, Nicole; Li, Hangkong; Shih, Kaimin; Glaeser, Roger; Luqueb, Rafael

doi:10.1016/j.molcata.2016.03.015

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Insights into the selective hydrogenation of levulinic acid to gamma-valerolactone using supported mono- and bimetallic catalysts

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Zitation

Al-Naji, M., Yepez, A., Balu, A. M., Romero, A. A., Chen, Z., Wilde, N., et al. (2016). Insights into the selective hydrogenation of levulinic acid to gamma-valerolactone using supported mono- and bimetallic catalysts. Journal of Molecular Catalysis A, 417, 145-152. doi:10.1016/j.molcata.2016.03.015.

Zitierlink: https://hdl.handle.net/21.11116/0000-0005-753D-4

Zusammenfassung

Hydrogenation of levulinic acid (LA) towards gamma-valerolactone (GVL) is one of the most promising reactions in the field of biomass valorization to fine chemicals and liquid transportation fuels. Bimetallic Ni-Pt and Ni-Ru supported on ZrO2 and gamma-Al2O3 were successfully utilized in this work as highly active and GVL-selective catalysts for the solvent-free hydrogenation of levulinic acid (LA) using formic acid (FA) as a hydrogen source in a microwave reactor, with results further translated into a continues flow system to prove the reaction mechanism. The supported bimetallic catalysts and their corresponding monometallic counterparts were characterized using N-2-sorption, elemental analysis, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). Under microwave irradiation, 100% selectivity to GVL was achieved using both mono- and bimetallic catalysts. Bimetallic Ni-Ru supported on gamma-Al2O3 shows the highest LA conversion (71%) among the studied catalysts. This high activity is attributed to a larger Ru degrees concentration on the surface of gamma-Al2O3 in comparison to ZrO2 as well as to the textural properties of y-Al2O3 (i.e., surface acidity, specific surface area). In contrast, ZrO2-based catalysts exhibited a higher stability with respect to gamma-Al2O3-based after four consecutive runs of reaction. (C) 2016 Elsevier B.V. All rights reserved.