The experimental procedure consisted of the following steps. First, the gasification reactor was heated to 800 C and once the temperature was stabilised, the first stage pyrolysis reactor was heated to 600 C with a heating rate of 40 C min 1. Since the biomass decomposition profile showed that the release of volatile compounds started around 220 C, the injection of water was started when the pyrolysis reactor reached 200 C in order to ensure the gaseous products derived from the biomass degradation were gasified with steam. Then, once the pyrolysis reactor reached 600 C, it was kept constant for 30 min. The products generated in the copyrolysis/gasification process were cooled passing through two condensers. The first condenser was cooled with air and the second one with dry ice in order to gather the liquid products. All the non-condensable gases were collected using a 10 L Tedlar gas sample bag. After finishing each experiment, the gases were collected for a further 20 min to ensure the reaction was completed. When the reactor was cooled, the sample holder, the condensers and the syringe were weighted to determine the amount of char, condensed liquid and injected water, respectively. Each experiment was repeated to ensure the reliability of results.