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Title: Pyrolysis of waste rubber tires with palladium doped zeolite
Authors: Hijazi, Ayman
Muhtaseb, Ala'a H.Al
Aouad, Samer 
Ahmad, Mohammad N.
Zeaiter, Joseph
Affiliations: Department of Chemistry 
Keywords: Pyrolysis
Waste to fuel
Noble metal
Subjects: Zeolites
Issue Date: 2019
Part of: Journal of environmental chemical engineering
Volume: 7
Issue: 6
Start page: 1
End page: 9
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. The MO4 tetrahedra structure was preserved in Pd/Hbeta with the acidity characterized by hydroxyl groups (OH) at FTIR absorption bands of 631 cm−1.
DOI: 10.1016/j.jece.2019.103451
Ezproxy URL: Link to full text
Type: Journal Article
Appears in Collections:Department of Chemistry

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