Abstract
5-Hydroxymethylfurfural, which can be derived from lignocellulosic biomass, can be transformed via the hydrodeoxygenation process to potential biofuels, such as 2,5 dimethylfuran or other chemicals of industrial importance. Non-noble metal catalysts constitute a robust and cheap solution for this process. In this work, the modification of the Ni/TiO2 catalyst by the addition of iron and support modification was evaluated. It was shown that bimetallic Ni-Fe catalysts are more selective and stable than their monometallic counterparts. This improvement in properties depends on the Ni:Fe ratio, but the support plays an equally important role—namely the high surface area anatase titania support improves the metal dispersion, resulting in a higher catalytic activity, and the formation of NiFe alloy facilitates the C=O bond cleavage. Such catalysts are active and stable and can be easily separated from the reaction mixture thanks to their magnetic properties.
Highlights
Lignocellulose biomass is a sustainable, abundant, and cost-efficient source of a wide spectrum of chemicals with applications ranging from pharmaceuticals to fuels [1]
5-methylfurfuryl alcohol (5-MFA) can further be hydrogenated to 5-methyltetrahydrofurfuryl alcohol (MTHFA), or undergo hydrodehydration for forming DMF, whose subsequent hydrogenation leads to
We showed that, by the choice of titania support for for Ni catalysts, we can strongly modify the selectivity and conversion of HMF hydrogenation [7]
Summary
Lignocellulose biomass is a sustainable, abundant, and cost-efficient source of a wide spectrum of chemicals with applications ranging from pharmaceuticals to fuels [1]. In the HMF hydrodeoxygenation reaction, various products can be obtained, the key challenge is to conduct this process selectively [7,8] To address this issue, noble metals, such as Au, Ru, Pt, Ru, and Pd, have often been used, whereas non-noble metal catalysts have received less attention [1]. We showed that, by the choice of titania support for for Ni catalysts, we can strongly modify the selectivity and conversion of HMF hydrogenation [7]. In our work we investigated titania based Ni-Fe catalysts for HMF hydrodeoxygenation We evaluated both the impact of the support (titania with different rutile to anatase ratio) and the presence of Ni-Fe interaction on the catalyst performance. The application of high-surface area and low-acidity anatase as a support of the Ni-Fe catalyst suppressed the formation of over-hydrogenated products from DMF. Characterization with a series of physico-chemical methods allowed us to deeply understand the relationship between the catalyst structure and activity
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