The co-pyrolysis/gasification with wood sawdust and polypropylene was carried out with and without catalyst to determine the influence of the plastic content on hydrogen production and the contribution of the catalyst. The mass balances and the product yields for different biomass/plastic ratios are shown in Table 2. The residue or char obtained after pyrolysis was calculated by difference between the initial and final weight of the sample placed in the sample holder. In order to increase the hydrogen production in the process, steam is known to be very effective to promote steam reforming and water gas shift (WGS) reactions [13].