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Polyethylene terephthalate (PET) is a synthetic polymer widely utilized in the packaging industry, particularly for bottles and containers. Due to its chemical stability and durability, PET accumulates in the environment, contributing significantly to plastic pollution. It comprises repeating units of terephthalic acid and ethylene glycol, resulting in a semi-crystalline structure that is resistant to natural degradation processes.A notable breakthrough in plastic biodegradation came with the...
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This study introduces a novel nickel-based catalyst (Ni3Ga/NiAlOx) for efficient chemical recycling of polyethylene terephthalate (PET). The catalyst demonstrates superior activity in dimethyl terephthalate recovery, offering a scalable and sustainable solution for plastic waste.

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depolymerizationheterogeneous catalysisinterface engineeringnickelpolyethylene terephthalate

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Area of Science:

  • Materials Science
  • Catalysis
  • Chemical Engineering

Background:

  • Polyethylene terephthalate (PET) is a prevalent plastic, with chemical recycling often relying on homogeneous catalysis, leading to separation challenges and waste.
  • Existing heterogeneous catalysts for PET recycling primarily enhance Lewis acidity via metal oxide variations, yet exhibit limited activity.
  • Controlling Lewis acidity in heterogeneous catalysts is crucial for improving PET chemical recycling efficiency.

Purpose of the Study:

  • To develop a novel heterogeneous catalyst for enhanced polyethylene terephthalate (PET) chemical recycling.
  • To systematically tune the electronic properties of nickel (Ni) active sites for modulated Lewis acidity.
  • To establish an electron-deficiency-dependent activity framework for catalyst design.

Main Methods:

  • Systematic tuning of electronic properties of nickel (Ni) active sites within intermetallic and layered double hydroxide (LDH) derivative structures.
  • Development and testing of a Ni3Ga/NiAlOx catalyst.
  • Utilizing theoretical and experimental validation to understand catalytic mechanisms.

Main Results:

  • The Ni3Ga/NiAlOx catalyst demonstrated significantly higher activity compared to conventional Lewis-acidic oxides, achieving near-quantitative dimethyl terephthalate recovery from post-consumer PET.
  • Electron-deficient interfacial Ni sites, modulated by electron withdrawal from O in NiAlOx and electron donation from Ga in Ni3Ga, were identified as key to high activity.
  • The catalyst preparation via co-precipitation is industrially viable and scalable.

Conclusions:

  • A novel electron-deficiency-dependent activity framework was established for designing highly active heterogeneous catalysts.
  • The Ni3Ga/NiAlOx catalyst offers an order-of-magnitude activity enhancement for PET chemical recycling, surpassing existing methods.
  • Bidirectional electronic modulation at catalyst interfaces optimizes substrate activation and product desorption, leading to superior catalytic efficiency.