Experimental investigation of intraparticle secondary reactions of tar during wood pyrolysis

► This study can clarify intraparticle secondary reactions of tar. ► Intraparticle reactions occur during the pyrolysis of large wood particle. ► Polymerization of tar (intraparticle reactions) progresses at approximately 380 °C. ► Intraparticle tar decomposition to secondary gas progresses at approximately 400 °C. ► Char works as a catalyst and lowers the reaction temperature of tar cracking.