Pt/ITQ-6 zeolite as a bifunctional catalyst for hydrocracking of waste plastics containing polystyrene

Thermal and catalytic hydrocracking of polystyrene to fuels was compared. The use of a bifunctional (platinum and acidic sites) catalyst such as Pt/Ferrierite not only increases conversion but also selectivity to a wider and more interesting variety of products in the gasoline range (C 5 –C 12 ). As...

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Bibliographic Details
Published in:Journal of material cycles and waste management 2015-07, Vol.17 (3), p.465-475
Main Authors: Fuentes-Ordóñez, E. G., Salbidegoitia, J. A., González-Marcos, M. P., Ayastuy, J. L., Gutiérrez-Ortiz, M. A., González-Velasco, J. R.
Format: Article
Language:English
Subjects:
Accessibility
Acidity
Analysis
Catalysts
Civil Engineering
Engineering
Environmental Management
Fourier transforms
Fuels
Gasoline
Hydrocracking
Materials selection
Plastic debris
Plastics
Platinum
Polyethylene
Polymers
Polystyrene
Polystyrene resins
Selectivity
Special Feature: Original Article
Spectrum analysis
Studies
Waste management
Waste Management/Waste Technology
Waste materials
Zeolites
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Summary:Thermal and catalytic hydrocracking of polystyrene to fuels was compared. The use of a bifunctional (platinum and acidic sites) catalyst such as Pt/Ferrierite not only increases conversion but also selectivity to a wider and more interesting variety of products in the gasoline range (C 5 –C 12 ). As polymer molecules present steric hindrance to access internal active sites in the catalyst, Pt/ITQ-6 was prepared by delamination to maximize the external surface of the catalyst while keeping its composition and type. Although Pt/ITQ-6 presented lower acidity than Pt/Ferrierite, it was mostly external and, thus, accessible to the reactants. In this way, Pt/ITQ-6 significantly improved activity and selectivity of Pt/Ferrierite. The performance of Pt/ITQ-6 when recycled polystyrene was used as reactant proved this catalyst is very promising for this application, although catalytic activity decreased as a consequence of plastic additives and impurities.
ISSN:1438-4957
1611-8227
DOI:10.1007/s10163-014-0322-2