Effects of metal oxides on the pyrolysis of poly(ethylene terephthalate)

Toshiaki Yoshioka, Tomohiko Handa, Guido Grause, Zhigang Lei, Hiroshi Inomata, Tadaaki Mizoguchi

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53 Citations (Scopus)


Metal oxides as Ca(OH)2, NiO, Fe2O3 or TiO2 showed different effects on the pyrolysis of PET. The experiments were carried out at 700 °C in a helium atmosphere using a laboratory equipment. Ca(OH)2 led to the hydrolysis of the PET and the following decarboxylation of the resulting terephthalic acid to benzene in a high amount up to 31 wt.%. By this means a yield of 77% related to the terephthalic acid content in the PET. The addition of Fe2O 3 led to a similar but weaker effect. Nickel oxide showed less influence on the pyrolysis products of PET. With titanium dioxide considerably less gaseous products were obtained. When a mixture of Ca(OH)2 and NiO was used PET was converted to synthesis-gas with a high hydrogen and carbon monoxide content and a gas amount of about 70%. The experiments with mixtures of Fe2O3 or TiO2 with Ca(OH)2 showed little differences to the experiments with pure Ca(OH)2.

Original languageEnglish
Pages (from-to)139-144
Number of pages6
JournalJournal of Analytical and Applied Pyrolysis
Issue number1
Publication statusPublished - 2005 Mar


  • Benzene
  • Calcium hydroxide
  • Feedstock recycling
  • Iron(III) oxide
  • Nickel oxide
  • Poly(ethylene terephthalate) (PET)
  • Pyrolysis
  • Titanium dioxide

ASJC Scopus subject areas

  • Analytical Chemistry
  • Fuel Technology


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