Degradation of Polypropylene and Polyethylene Wastes Over HZSM-5 and USY Zeolites
- 21 Downloads
This work provides evidence that ultra-stable Y zeolite (USY) and HZSM-5 zeolites were active as catalysts for the pyrolysis of urban plastic wastes, decreasing its degradation temperature. When HZSM-5 was used as the catalyst, at 450 °C and 30 min, an increase in the solid fraction and a reduction in the liquid fraction were observed. On the other hand, the best catalytic cracking performance was observed for the reaction catalyzed by USY zeolite, and a higher amount of liquid fraction was obtained. Moreover, the increase of reaction time and temperature was favorable to obtain better results in thermal pyrolysis. As to the liquid fraction composition, its components were alkylbenzenes, olefins, and naphthalenes in the thermal pyrolysis whereas alkylbenzenes were the main component in the HZSM-5-catalysed pyrolysis and that catalyzed by USY provides higher amounts of olefins.
KeywordsHZSM-5 USY Pyrolysis Plastic waste Polyolefin
This study was financed by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brasil (CAPES) and by the Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ).
Compliance with Ethical Standards
Conflict of interest
The authors declare that they no conflict of interest.
- 19.Li K, Lees W, Yuan G, Lei J, Lin S, Weerachanchai P, Yang Y, Wang Y (2016) Investigation into the catalytic activity of microporous and mesoporous catalysts in the pyrolysis of waste polyethylene and polypropylene mixture. Energies 9:1–15Google Scholar
- 22.Thommes M, Kaneko K, Neimark AV, Oliver JP, REinoso FR, Roquerol J, Sing KSW (2015) Physisorption of gases, with special reference to the evaluation of surface area and pore size distribution (IUPAC Technical Report). Pure Appl Chem 87(9–10):1051–1069Google Scholar
- 23.Sousa ZSB, Cesar DV, Henriques CA, Silva VT (2014) Bioethanol conversion into hydrocarbons on HZSM-5 and HMCM-22 zeolites: use of in situ DRIFTS to elucidate the role of the acidity and of the pore structure over the coke formation and product distribution. Catal Today 234:182–191CrossRefGoogle Scholar