Gasification of char from wood pellets and from wood chips: Textural properties and thermochemical conversion along a continuous fixed bed

► Axial profiles of temperature and gas species concentration were realized along a continuous char fixed bed gasifier. ► Axial profiles of char composition, char bed density and particle velocity were realized along the char bed. ► In our operating conditions, the char bed reactive zone is 3 times longer for chips (45 cm) than for pellets (16 cm). ► Pelletization has no effect on final char conversion (about 95%) and syngas quality (16% H2 and 13% CO). ► Bed compaction is similar for wood chip char and wood pellet char.