期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 9, 期 35, 页码 11661-11666出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.1c03786
关键词
Plastic upcycling; Hydrogenolysis; Polypropylene; Polyethylene; Mixed plastics; Depolymerization; Ruthenium
资金
- U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy
- U.S. Department of Energy, Advanced Manufacturing Office (AMO)
- U.S. Department of Energy, Bioenergy Technologies Office (BETO)
- AMO [DE-AC3608GO28308]
- BETO [DE-AC3608GO28308]
- National Renewable Energy Laboratory (NREL)
- NREL [DE-AC36-08GO28308]
- Arnold O. Beckman Postdoctoral Fellowship
Catalytic depolymerization of polyolefins is a promising chemical recycling strategy utilizing noble metal and hydrogen for breaking strong C-C bonds. The study investigated the conversion of polypropylene under mild conditions, demonstrating trade-offs between product yield and temperature, hydrogen pressure, and reaction time. The characterized catalyst was found to be recyclable and effective in depolymerizing a mixture of high-density polyethylene and PP, showcasing feasibility for mixed polyolefin waste streams.
Catalytic depolymerization of polyolefins is a promising chemical recycling strategy to create value-added products from waste plastics, which are accumulating in landfills and the natural environment at unsustainable rates. The cleavage of strong C-C bonds in polyolefins can be performed using a noble metal and hydrogen via a hydrogenolysis mechanism. Previously, we identified ruthenium nanoparticles supported on carbon (Ru/C) as a highly active heterogeneous catalyst for the conversion of polyethylene into liquid and gaseous n-alkanes under mild conditions. In the present study, we investigated the catalytic depolymerization of polypropylene (PP) under mild conditions (200-250 degrees C, 20-50 bar H-2). We demonstrate that Ru/C produces C-5-C-32 iso-alkane yields above 68% in the absence of solvent and identify trade-offs between product yield and temperature, hydrogen pressure, and reaction time. We apply a rigorous analytical method to quantify all liquid and gaseous alkane products. The characterized catalyst was found to be recyclable after the complete depolymerization of high molecular weight PP (M-w similar to 340,000 Da) to liquid and gaseous hydrocarbons and after depolymerization of a postconsumer PP centrifuge tube. Further, the catalyst was shown to be effective in depolymerizing a mixture of high-density polyethylene and PP to produce a mixture of linear and branched liquid alkanes, demonstrating feasibility for the depolymerization of streams of mixed polyolefin waste.
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