The co-pyrolysis/gasification of wood sawdust and different kinds of plastics was carried out in a two stage fixed bed reactor. 2 g of a biomass and plastic mixture were placed in a sample holder in the first stage pyrolysis reactor and this blend was pyrolysed at 600 C. Experiments were performed with the biomass alone or binary mixtures with PP, varying the plastic content from zero to 20 wt.% in the initial feedstock. In addition, the influence of plastic type was studied feeding a blend of 80 wt.% of biomass and 20 wt.% of HDPE, PS or RP into the reactor. The vapours generated in the first stage were then passed directly to the second stage gasifi- cation reactor, where the temperature was maintained at 800 C. Water, which was converted into steam, was used as the gasifying agent in the process, and was introduced into the second stage reactor using a syringe pump. The injection rate of water was 4.74 ml h 1. 1 g of the prepared Ni/Al2O3 catalyst was placed in the second reactor supported on quartz wool. When the experiment was carried out without catalyst, only quartz wool was placed inside the gasification reactor. During the entire process, nitrogen was used as carrier gas with a flow rate of 80 ml min 1 A schematic diagram of the pyrolysis/gasification unit has been described in a previous paper