Palladium nanoparticles of 3.2 +/- 0.9 nm size were generated within 12-18 mesh pellets of hybrid zirconia/polyvinyl alcohol matrix, to afford a 0.03-0.1% Pd loading (w/w). The material was used in the catalytic, continuous flow hydrogenation reaction of multiple C=C and C=C bonds and nitrobenzene, showing good selectivity at full conversion and excellent resistance over prolonged time-on-stream under room temperature and 1-2 bar H-2 gas. No metal leaching in solution was detected as well as no additives nor regeneration steps were needed for use in hydrophilic solvents. (C) 2014 Elsevier B.V. All rights reserved.