Efficient catalytic hydrogenation of levulinic acid: a key step in biomass conversion József M. Tukacs, a Dávid Király, a Andrea Strádi a , Gyula Novodarszki, Zsuzsanna Eke, a Gábor Dibó, a Tamás Kégl b , and László T. Mika* ,a a Institute of Chemisty, Eötvös University, Pázmány Péter s. 1/a, Budapest, H- 1117 Hungary b Institute of Chemisty, University of Pécs, Vasvári Pál utca 4., Pécs, H-7622, Hungary Supporting Information Electronic Supplementary Material (ESI) for Green Chemistry This journal is © The Royal Society of Chemistry 2012