Suriapparao, D.V.Sridevi, V.Ramesh, R.Sankar Rao, C.S.Tukarambai, M.Kamireddi, D.Gautam, R.Dharaskar, S.A.Pritam, K.2026-02-042022Bioresource Technology, 2022, 362, , pp. -9608524https://doi.org/10.1016/j.biortech.2022.127813https://idr.nitk.ac.in/handle/123456789/22382In the current study, catalytic co-pyrolysis was performed on waste tea powder (WTP) and polystyrene (PS) wastes to convert them into value-added products using KOH catalyst. The feed mixture influenced the heating rates (17–75 °C/min) and product formation. PS promoted the formation of oil and WTP enhanced the char formation. The maximum oil yield (80 wt%) was obtained at 15 g:5 g, and the maximum char yield (44 wt%) was achieved at 5 g:25 g (PS:WTP). The pyrolysis index (PI) increased with the increase in feedstock quantity. High PI was noticed at 25 g:5 g, and low PI was at 5 g:5 g (PS:WTP). Low energy consumption and low pyrolysis time enhanced the PI value. Significant interactions were noticed during co-pyrolysis. The obtained bio-oil was analyzed using GC–MS and a plausible reaction mechanism is presented. Catalyst and co-pyrolysis synergy promoted the formation of aliphatic and aromatic hydrocarbons by reducing the oxygenated products. © 2022 Elsevier LtdAromatic hydrocarbonsCatalystsEnergy utilizationPotassium hydroxidePyrolysisCopyrolysisExperimental approachesMicrowave-assistedPolystyrene wastePyrolysis analysisSynergistic effectTea powderWaste teaWaste tea powder]+ catalystPolystyrenesbiofuelcatalysiscatalystexperimental studyfuel consumptionheatingoxygenationpyrolysissustainabilitypolystyrene derivativeheatmicrowave radiationpowderteaBiofuelsCatalysisHot TemperatureMicrowavesPowdersTea