Pyrolysis is a termochemical decomposition of organic material at high temperatures in the absence of oxygen. This method is used for turning wood into charcoal. The limited supply of oxygen prevents the charcoal from burning.
During pyrolysis, biomass undergoes a sequence of changes and normally yields a charcoal. Generally, charcoal production through pyrolysis is maximized in a process of low temperatures and slow heating rates, the so-called carbonization.