Biomass is made up of a mixture of polymers with different physicochemical structures, so thermal decomposition proceeds by stages. Initially, hemicellulose which is a weak structure and with lower molecular weight, breaks down in a temperature range 200-300 °C, followed by the cellulose which decomposes between 300-450 °C, and finally, the lignin breaks down between 250-500 °C which is the major contributor of char production at the end of pyrolysis