Thermo-catalytic pyrolysis of biomass and plastic mixtures using HZSM-5

Z. Sebestyén, E. Barta-Rajnai, J. Bozi, M. Blazso, E. Jakab, N. Miskolczi, J. Sója, Zs Czégény

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

The catalytic effect of HZSM-5 zeolite was studied on the thermal decomposition of model waste mixtures of plastics (composed of PE, PP, and PET) and biomass (composed of newspaper, cardboard, and pine sawdust). The influence of temperature and catalyst ratio as well as the hindering effect of cellulose and lignin on the catalytic decomposition of plastic waste were studied applying analytical pyrolysis at low and high heating rate by thermogravimetry/mass spectrometry (TG/MS) and pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS), respectively. The products of laboratory scale batch pyrolysis and thermo-catalytic pyrolysis were analyzed in details and compared. HZSM-5 catalyst reduced the thermal stability of plastic waste, but the catalytic effect was blocked when 50% cellulose or 10% lignin were mixed in the plastic waste. Principal component analysis (PCA) has been applied to reveal correlations between the composition of pyrolysis products, pyrolysis temperature and proportion of the applied catalyst. It was established that the hindering effect of biomass could be compensated by applying higher catalyst ratio. In a batch reactor, the use of HZSM-5 catalyst led to a significant increase in the yields of volatiles (both gases and pyrolysis oil); moreover aromatization or isomerization effects have been observed. Aromatic compounds were produced to a reduced extent by thermo-catalytic pyrolysis of biomass-containing plastic waste compared to that of plastic waste indicating that the cellulose and lignin components of the waste lower the HZSM-5 catalyst activity.

Original languageEnglish
Pages (from-to)114-122
Number of pages9
JournalApplied Energy
Volume207
DOIs
Publication statusPublished - Dec 1 2017

Fingerprint

pyrolysis
plastic waste
Biomass
Pyrolysis
plastic
Plastics
catalyst
biomass
lignin
Catalysts
Lignin
cellulose
Cellulose
Mass spectrometry
mass spectrometry
thermogravimetry
Aromatization
thermal decomposition
Sawdust
Aromatic compounds

Keywords

  • Biomass waste
  • Catalytic pyrolysis
  • HZSM-5
  • Plastic waste

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Energy(all)
  • Mechanical Engineering
  • Management, Monitoring, Policy and Law

Cite this

Thermo-catalytic pyrolysis of biomass and plastic mixtures using HZSM-5. / Sebestyén, Z.; Barta-Rajnai, E.; Bozi, J.; Blazso, M.; Jakab, E.; Miskolczi, N.; Sója, J.; Czégény, Zs.

In: Applied Energy, Vol. 207, 01.12.2017, p. 114-122.

Research output: Contribution to journalArticle

Sebestyén, Z. ; Barta-Rajnai, E. ; Bozi, J. ; Blazso, M. ; Jakab, E. ; Miskolczi, N. ; Sója, J. ; Czégény, Zs. / Thermo-catalytic pyrolysis of biomass and plastic mixtures using HZSM-5. In: Applied Energy. 2017 ; Vol. 207. pp. 114-122.
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AB - The catalytic effect of HZSM-5 zeolite was studied on the thermal decomposition of model waste mixtures of plastics (composed of PE, PP, and PET) and biomass (composed of newspaper, cardboard, and pine sawdust). The influence of temperature and catalyst ratio as well as the hindering effect of cellulose and lignin on the catalytic decomposition of plastic waste were studied applying analytical pyrolysis at low and high heating rate by thermogravimetry/mass spectrometry (TG/MS) and pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS), respectively. The products of laboratory scale batch pyrolysis and thermo-catalytic pyrolysis were analyzed in details and compared. HZSM-5 catalyst reduced the thermal stability of plastic waste, but the catalytic effect was blocked when 50% cellulose or 10% lignin were mixed in the plastic waste. Principal component analysis (PCA) has been applied to reveal correlations between the composition of pyrolysis products, pyrolysis temperature and proportion of the applied catalyst. It was established that the hindering effect of biomass could be compensated by applying higher catalyst ratio. In a batch reactor, the use of HZSM-5 catalyst led to a significant increase in the yields of volatiles (both gases and pyrolysis oil); moreover aromatization or isomerization effects have been observed. Aromatic compounds were produced to a reduced extent by thermo-catalytic pyrolysis of biomass-containing plastic waste compared to that of plastic waste indicating that the cellulose and lignin components of the waste lower the HZSM-5 catalyst activity.

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