Evolution of char structure during steam gasification of the chars produced from rapid pyrolysis of rice husk

► The C, H and O content decrease by more than 85%, 67% and 91%, respectively. ► The maximum porosity appears at char conversion of 48.6%. ► Ds and dave show a good linear relationship during steam gasification. ► The char becomes more ordered and enriched with larger aromatic ring systems. ► K, Mg and Ca show a similar behavior and their concentrations reach maxima at 60.3%.