Effect of feedstock water content and pyrolysis temperature on the structure and reactivity of spruce wood char produced in fixed bed pyrolysis

► Higher water content led to a higher liquid and a lower char yield. ► The specific char surface area increased with increasing initial water content. ► Increasing pyrolysis temperature up to 800 °C led to a 200 times smaller BET area. ► The micro-pores became about 10 times smaller at high pyrolysis temperatures. ► Reactivity in CO2 significantly decreased with increasing pyrolysis temperature.