Pyrolysis of polyethylene terephthalate containing real waste plastics using Ni loaded zeolite catalysts

2018 7th International Conference on Clean and Green Energy

能源学;生态环境科学

Al-Asadi, M.^1 ; Miskolczi, N.^1

University of Pannonia, Faculty of Engineering, Institute of Chemical Engineering and Process Engineering, MOL Department of Hydrocarbon and Coal Processing, Egyetem u. 10, Veszprém

H-8200, Hungary^1

关键词: Branched hydrocarbons;    Elevated temperature;    Gasification reaction;    Increasing temperatures;    Isomerization reaction;    Oxygen-containing compounds;    Oxygenated hydrocarbon;    Polyethylene terephthalates (PET);   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/154/1/012021/pdf
DOI  :  10.1088/1755-1315/154/1/012021

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

In this work the pyrolysis of polyethylene terephthalate (PET) containing real waste plastic was investigated using different Ni loaded catalysts: Ni/ZSM-5, Ni/y-zeolite, Ni/β-zeolite and Ni/natural zeolite (clinoptilolite). Raw materials were pyrolyzed in a horizontal tubular reactor between 600 and 900°C using 10% of catalysts. It was found, that both temperature increasing and catalysts presence can increase the gas yields, however owing to gasification reactions, the pyrolysis oil yield decreased with increasing temperature. Ni/y-zeolite catalyst had the most benefit in gas yield increasing at low temperature; however Ni/ZSM-5 showed advanced property in gas yield increasing at high temperature. Gases contained hydrogen, carbon oxides and hydrocarbons, which composition was significantly affected by catalysts. Ni loaded zeolites favoured to the formation of hydrogen and branched hydrocarbons; furthermore the concentrations of both CO and CO2were also increased as function of elevated temperature. That phenomenon was attributed to the further decomposition of PET, especially to the side chain scission reactions. Owing to the Boudouard reaction, the ratio of CO2/CO can increased with temperature. Pyrolysis oils were the mixtures of n-saturated, n-unsaturated, branched, oxygen free aromatics and oxygenated hydrocarbons. Temperature increasing has a significant effect to the aromatization and isomerization reactions, while the catalysts can efficiently decreased the concentration of oxygen containing compounds.