Synthesis of Sustainable Chemicals from Waste Tea Powder and Polystyrene via Microwave-Assisted in-situ Catalytic Co-Pyrolysis: Analysis of Pyrolysis using Experimental and Modeling Approaches

Dadi V Suriapparao, Veluru Sridevi, Potnuri Ramesh, Chinta Sankar Rao, M Tukarambai, Dinesh Kamireddi, Ribhu Gautam, Swapnil A Dharaskar, Kocherlakota Pritam

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1 Scopus citations

Abstract

In 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 oC/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 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 plausible reaction mechanism is presented. Catalyst and co-pyrolysis synergy promoted the formation of aliphatic and aromatic hydrocarbons by reducing the oxygenated products.
Original languageEnglish (US)
Pages (from-to)127813
JournalBioresource technology
Volume362
DOIs
StatePublished - Aug 29 2022

ASJC Scopus subject areas

  • Bioengineering
  • Environmental Engineering
  • Waste Management and Disposal

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