TY - JOUR A1 - Agirrezabal-Telleria, Iker A1 - Hemmann, Felix A1 - Jäger, Christian A1 - Arias, P. L. A1 - Kemnitz, E. T1 - Functionalized partially hydroxylated MgF2 as catalysts for the dehydration of d-xylose to furfural N2 - Among the furan-based compounds, furfural (FUR) shows interesting properties as building-block or industrial solvent. It is produced from pentosan-rich biomass via xylose cyclodehydration. The current FUR production uses homogeneous catalysts and steam. According to recent studies, the reaction mechanism is different in the presence of Lewis (L) or Brønsted (B) sites. In this work, partially hydroxylated MgF2 catalysts, containing bifunctional Lewis and Brønsted properties, were further functionalized using different fluorosulfonic precursors. Its main objective was to test these solids as catalysts for xylose conversion to furfural. Extensive characterization techniques using TG–MS, 19F-MAS-NMR, or pyridine adsorption confirmed the substitution of surface OH groups by stronger Brønsted sites. The activity data showed a considerable change of the reaction kinetics and a final furfural selectivity of 90% at 160 °C in water/toluene for optimized L/B ratios by the one-step grafting technique. Moreover, the reaction analyses and the change of conversion pathways were studied. KW - Hydroxylated MgF2 KW - Functionalization KW - Fluorosulfonic acid KW - Lewis KW - Brønsted KW - Xylose KW - Furfural PY - 2013 DO - https://doi.org/10.1016/j.jcat.2013.05.005 VL - 305 SP - 81 EP - 91 AN - OPUS4-30444 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -