Ru/TiO2-based catalysts for the hydrogenation of levulinic acid using formic acid as internal hydrogen source

Abstract : Active and selective Ru catalysts based on TiO2 supports have been developed for the combined hydrogenation of levulinic acid to γ-valerolactone with internal hydrogen supply via in-situ formic acid decomposition. A controlled modification of the TiO2 support by Ca2+ improved the catalytic performance in the one-pot hydrogenation, as a result of enhanced performances in both the formic acid dehydrogenation and the levulinic acid hydrogenation. The improved performances were associated to stronger Ru/support interactions with weaker CO adsorption, as well as to an increased support basicity. The performances were further exalted thanks to a one-step solar light photon-assisted synthesis method used as sustainable alternative to classical wet impregnation. It enabled the uniform dispersion of sub-nanometric metallic Ru particles with narrow distribution and fine size monitoring, and a volcano-type profile centered at 1.5 nm was demonstrated between the nanoparticle size and the activity.
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Joanna Wojciechowska. Ru/TiO2-based catalysts for the hydrogenation of levulinic acid using formic acid as internal hydrogen source. Other. Université de Strasbourg; Uniwersytet łódzki, 2018. English. ⟨NNT : 2018STRAF061⟩. ⟨tel-02160043⟩

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