The aqueous-phase reforming of xylitol to produce bio-hydrogen was studied on Pt/A1203 catalysts containing 0.30, 0.57, 1.50 and 2.77%wt Pt by varying the weight hourly space velocity (WHSV) between 0.6 and 2.4 11-1. At a constant WHSV value, the gaseous/liquid products ratio depended on the amount of surface Pt concentration on the sample (Pts). The xylitol conversion to gaseous products increased with Pts while xylitol conversion to liquid products did not change significantly. At a constant xylitol conversion, the H-2 selectivity increased with Pts. The H-2 yield increased continuously with both contact time and Pts. The H-2 productivity (Pr, mmol H-2/h gcat) increased with both WHSV and Pts; indeed, the maximum Pr value obtained when using 1% xylitol in the feed (28 mmol H-2/gcat h) was obtained on Pt(2.77)/A1203 catalysts at WHSV = 2.4 11-1. The effect of the xylitol concentration on H-2 productivity was also investigated. At a constant space velocity, the H2 selectivity and productivity decreased with increasing xylitol concentration in the feed. (C)2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.