KINETIC DETERMINATION OF PYROLYSIS OF PLASTIC-STRAW DERIVED PELETS BY TG-DTG
Abstract
In this work, kinetic parameters of pyrolysis of pellets derived from plastic-waste and straw were evaluated by thermogravimetry (TG) and derivative thermogravimetry (DTG), and differential thermal analysis (DTA). Feedstocks including plastic wastes (PP and PE) and straw were used to prepare pellets of 100% plastic (N), 100% straw (T) and plastic-straw (NT) under a weight ratio of 70% plastic to 30% straw. Ultimate analysis of organic elements content (C, H, N, S and O); proximate analysis of moisture content (%M), volatile matter content (%VOC), fixed-carbon content (%FC) and ash content (%Ash) of the plastic and straw samples were determined. TG, DTG and DTA analysis data of the pellets in inert atmosphere (N2) were applied to the Coats–Redfern model to determine the activation energy (Ea) of pyrolysis. The results showed that the activation energy with the values of 80.3 kJ/mol and 105.2 kJ/mol in corresponding to the pellets of N and T, respectively, decreased sharply to the value of 33.5 kJ/mol for the NT pellet. It can be suggested that combining straws and plastic in pyrolysis is favourable for fabricating biochar.