Pyrolysis of waste rubber tires with palladium doped zeolite

Ayman Hijazi, Ala'A H. Al-Muhtaseb, Samer Aouad, Mohammad N. Ahmad, Joseph Zeaiter*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)


This paper investigates the pyrolysis of waste rubber tires using zeolite-based heterogeneous catalysts. The catalytic activity of Hbeta and Pd/Hbeta was studied by examining the pyrolysis product yields. The gas yield from non-catalytic pyrolysis was at 20% while the use of Hbeta increased the gas yield to 28%. Doping Hbeta with Pd noble metal made a significant enhancement in hydrocarbon cracking producing a gas yield of 37%. The enhanced catalytic activity of Pd/Hbeta was due to dehydrogenation-hydrogenation reactions induced by the Pd metal sites. The incorporation of Pd into zeolite Hbeta led to appreciable improvements in the morphology of the catalyst. Pd-doping increased the surface area from 434 m2/g to 450 m2/g. The pore size also increased from 2.96 nm to 3.69 nm with a smaller crystallite size of 1.59 nm.

Original languageEnglish
Article number103451
JournalJournal of Environmental Chemical Engineering
Issue number6
Publication statusPublished - Dec 2019


  • Catalysis
  • Noble metal
  • Pyrolysis
  • Waste to fuel
  • Zeolites

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Waste Management and Disposal
  • Pollution
  • Process Chemistry and Technology


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