Influence of H-ZSM-5, Al-MCM-41 and acid hybrid ZSM-5/MCM-41 on polyethylene decomposition

F. S M Sinfrônio, A. G. Souza, Ieda M G Santos, V. J. Fernandes, Cs Novák, Zsuzsanna Éhen

Research output: Contribution to journalArticle

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Abstract

Thermogravimetry (TG) and mass spectrometry (MS) combined techniques have been used to investigate the thermal degradation and catalytic decomposition of high-density polyethylene (HDPE) over solid acid catalysts as H-ZSM-5, Al-MCM-41 and a hybrid material with a bimodal pore size distribution (H-ZSM-5/Al-MCM-41). The silicon/aluminum ratio of all catalysts is 15. Both thermal and catalytic processes showed total conversion in a single mass loss step. Furthermore, the catalytic conversion presents average reduction of 27.4%, in the onset decomposition temperature. The kinetic parameters were calculated using non-isothermal method. These parameters do not indicate significant differences between the thermal and catalytic processes. Even though, the presence of the catalysts changes the reaction mechanism, from phase boundary controlled reaction to random nucleation mechanism. Important difference in distribution of evolved products was detected when several catalysts were used. However, in all cases the main products were alkanes (C2, C 3 and C4), alkenes (C3 and C4), dienes (C4 and C5) and traces of aromatic compounds.

Original languageEnglish
Pages (from-to)391-399
Number of pages9
JournalJournal of Thermal Analysis and Calorimetry
Volume85
Issue number2
DOIs
Publication statusPublished - Aug 2006

Fingerprint

Multicarrier modulation
Polyethylene
Polyethylenes
polyethylenes
Decomposition
decomposition
catalysts
acids
Catalysts
Acids
Alkanes
aromatic compounds
Aromatic compounds
thermal degradation
Hybrid materials
Alkenes
Phase boundaries
dienes
Silicon
High density polyethylenes

Keywords

  • HDPE
  • Kinetic parameters
  • Mass spectrometry
  • Thermogravimetry
  • Zeolitic materials

ASJC Scopus subject areas

  • Chemical Engineering(all)

Cite this

Influence of H-ZSM-5, Al-MCM-41 and acid hybrid ZSM-5/MCM-41 on polyethylene decomposition. / Sinfrônio, F. S M; Souza, A. G.; Santos, Ieda M G; Fernandes, V. J.; Novák, Cs; Éhen, Zsuzsanna.

In: Journal of Thermal Analysis and Calorimetry, Vol. 85, No. 2, 08.2006, p. 391-399.

Research output: Contribution to journalArticle

Sinfrônio, F. S M ; Souza, A. G. ; Santos, Ieda M G ; Fernandes, V. J. ; Novák, Cs ; Éhen, Zsuzsanna. / Influence of H-ZSM-5, Al-MCM-41 and acid hybrid ZSM-5/MCM-41 on polyethylene decomposition. In: Journal of Thermal Analysis and Calorimetry. 2006 ; Vol. 85, No. 2. pp. 391-399.
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