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Plastic waste to fuels by hydrocracking at mild conditions
Liu, S.; Kots, P.A.; Vance, B.C.; Danielson, A.; Vlachos, D.G. (2021). Plastic waste to fuels by hydrocracking at mild conditions. Science Advances 7(17): eabf8283. https://hdl.handle.net/10.1126/sciadv.abf8283
In: Science Advances. AAAS: New York. ISSN 2375-2548; e-ISSN 2375-2548, meer
Peer reviewed article  
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  • Liu, S.
  • Kots, P.A.
  • Vance, B.C.
  • Danielson, A.
  • Vlachos, D.G.
Abstract
    Single-use plastics impose an enormous environmental threat, but their recycling, especially of polyolefins, has been proven challenging. We report a direct method to selectively convert polyolefins to branched, liquid fuels including diesel, jet, and gasoline-range hydrocarbons, with high yield up to 85% over Pt/WO3/ZrO2 and HY zeolite in hydrogen at temperatures as low as 225°C. The process proceeds via tandem catalysis with initial activation of the polymer primarily over Pt, with subsequent cracking over the acid sites of WO3/ZrO2 and HY zeolite, isomerization over WO3/ZrO2 sites, and hydrogenation of olefin intermediates over Pt. The process can be tuned to convert different common plastic wastes, including low- and high-density polyethylene, polypropylene, polystyrene, everyday polyethylene bottles and bags, and composite plastics to desirable fuels and light lubricants.
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