Thermal and thermo-catalytic degradation of high-density polyethylene waste

N. Miskolczi, L. Bartha, G. Deák, B. Jóver, D. Kalló

Research output: Contribution to journalArticle

66 Citations (Scopus)

Abstract

Thermal and thermo-catalytic cracking behaviour of a commercial high-density polyethylene (HDPE) waste was investigated in the temperature range of 400-450°C in a laboratory scale pyrex batch reactor. An equilibrium fluid catalytic cracking catalyst (FCC), HZSM-5 and a clinoptilolite containing rhyolite tuff were used as catalysts. The presence of a catalyst significantly altered both the yield and composition of the products and differences were found between catalysts having different acidities, micro- and macropore surface areas. The yield of gases increased in the order: non-thermo-catalytic cracking < clinoptilolite < FCC < HZSM-5 catalysed cracking, while the yields of liquid products increased in the sequence of non-thermo-catalytic cracking < clinoptilolite < HZSM-5 < FCC catalysed cracking. The catalysts significantly affected the isomerization of the olefin double bond and of the carbon-chain of the cracked products, the olefin content of liquids did not differ considerably. The effect of the catalysts on the yields and structure of products were getting less significant with increasing cracking temperature. The range of the carbon atom number in liquids was C5-C28, in non-thermo-catalytic cases, whereas using catalysts it was C5-C 25, but the temperature of cracking had a noticeable effect on the distribution of carbon atom. Each liquid fraction is of low sulphur content, which may be advantageous for application as fuel.

Original languageEnglish
Pages (from-to)235-242
Number of pages8
JournalJournal of Analytical and Applied Pyrolysis
Volume72
Issue number2
DOIs
Publication statusPublished - Nov 2004

Keywords

  • Catalytic pyrolysis
  • HDPE
  • Waste recycling

ASJC Scopus subject areas

  • Analytical Chemistry
  • Fuel Technology

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