Products Distribution and Synergistic Effects Analysis during Co-Pyrolysis of Agricultural Residues and Waste Tire Using Gas Chromatography/Mass Spectrometry

The co-thermal chemical conversion of biomass and waste tires is an important direction for the utilization of waste resources to produce renewable energy. In this study, the products distribution and synergistic effects during the co-pyrolysis of agricultural residues and waste tire were analyzed by a pyrolyzer coupled with gas chromatograph/mass spectrometer (Py-GC/MS). Pyrolysis and co-pyrolysis products were analyzed at 550°C and 650°C for maize stalk (MS), wheat straw (WS), waste tire (WT) feedstocks, as well as mixtures of wheat straw-waste tire (WS:WT mass ratio of 1:1), and maize stalk-waste tire (MS:WT mass ratio of 1:1). The results showed that the co-pyrolysis of agricultural residues and waste tire promoted the release of phenols, aldehydes and ketone derivatives, and reduced the formation of H2 and H2O. In addition, relatively high content of aromatic hydrocarbons was obtained at 650°C temperature, while 550°C was optimal when considering the formation of ketones. The results showed synergistic effect in the co-pyrolysis of biomass and waste tire.