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Effect of Polyethylene Pyrolysis Oil Hydrotreatment on the Pt/Al2O3 Catalyst: Experimental Characterization
Panayiota Adamou1, Eleana Harkou1, Ali Bumajdad2
1Department of Chemical Engineering, Cyprus University of Technology, 57 Corner of 6 Athinon and Anexartisias, 3036 Limassol, Cyprus.
This study examines platinum on alumina catalysts after hydrotreating plastic-derived pyrolysis oil. Results show increased carbon deposition on spent catalysts, particularly in granular form, impacting performance.
Area of Science:
- Materials Science
- Catalysis
- Environmental Science
Background:
- Rising plastic waste and low recycling rates pose sustainability challenges.
- Hydrotreatment upgrades petroleum-derived fuel oils; its application to plastic pyrolysis oil is under-explored.
Purpose of the Study:
- Investigate platinum on alumina (Pt/Al2O3) catalyst properties before and after hydrotreating pyrolysis oil from linear low-density polyethylene.
- Characterize catalyst changes to understand performance limitations.
Main Methods:
- Utilized granular and powder Pt/Al2O3 catalysts.
- Employed transmission electron microscopy, X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), thermogravimetric analysis (TGA), and IR-RIS for characterization.
Main Results:
- XRD confirmed catalyst support crystallinity remained unchanged post-hydrotreatment.
- TGA indicated higher carbon deposition on spent catalysts (15.359% weight loss) versus fresh (11.43%).
- XPS revealed more intense carbon deposition on granular spent catalysts, with IR-RIS identifying coke formation via a C=O band.
Conclusions:
- Hydrotreatment of plastic pyrolysis oil leads to significant carbon deposition on Pt/Al2O3 catalysts, especially in granular form.
- Understanding and mitigating coke formation is crucial for industrial application and cost-effectiveness.
- Further research on catalyst modification is needed to enhance performance and durability.
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