Catalytic reforming of gaseous products from pyrolysis of low-density polyethylene over iron-modified ZSM-5 catalysts

Converting plastic wastes into fuels through catalytic cracking is continuously gaining interest from researchers worldwide. In this study, the influence of iron on ZSM-5 (Fe-ZSM-5) catalyst on the reforming of the gaseous products of thermal decomposition of low-density polyethylene (LDPE) was inve...

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Bibliographic Details
Published in:Applied petrochemical research 2019-06, Vol.9 (2), p.101-112
Main Authors: Waziri, Abubakar Y., Osigbesan, Aisha A., Dabai, Fadimatu N., Shuwa, Suleiman M., Atta, Abdulazeez Y., Jibril, Baba Y.
Format: Article
Language:English
Subjects:
Acidification
Aliphatic compounds
Aromatic hydrocarbons
Catalysis
Catalysts
Catalytic converters
Catalytic cracking
Chemistry
Chemistry and Materials Science
Condensates
Decomposition
Density
Energy Systems
Industrial Chemistry/Chemical Engineering
Iron
Low density polyethylenes
Nanochemistry
Nanotechnology and Microengineering
Original Article
Petroleum
Plastic debris
Polyethylene
Pyrolysis
Refining
Reforming
Temperature effects
Thermal decomposition
Xylene
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Summary:Converting plastic wastes into fuels through catalytic cracking is continuously gaining interest from researchers worldwide. In this study, the influence of iron on ZSM-5 (Fe-ZSM-5) catalyst on the reforming of the gaseous products of thermal decomposition of low-density polyethylene (LDPE) was investigated. The acidified ZSM-5 catalysts (0, 0.3, 0.6 and 1 wt% of Fe) were prepared and characterized by XRD, BET, FTIR and SEM techniques. In particular, the effects of temperature (400, 450 and 500 °C) and catalyst loading (0.5, 0.75, 1.0, 1.25 and 1.5 g) on a two-stage (pyrolyser and reformer) decomposition of the LDPE wastes into fuel were studied. The liquid fraction produced was characterized using FTIR and GC/MS techniques. The study showed that the increase in pyrolysis temperature (400–500 °C) increases the volume of non-condensable gas (31–58 wt%) and decreases the volume of the condensates (69–41 wt%) in both the thermal and catalytic pyrolyses. However, the trend was at higher level for the catalytic pyrolysis. The increase in temperature for the thermal pyrolysis had less significant effect on the aromatization content of the liquid condensate compared to the catalytic pyrolysis. The FTIR results show a significant increase in aromatic contents and decrease in the aliphatic of the liquid fraction for the catalytic pyrolysis reforming when compared with thermal pyrolysis. The GC/MS results confirmed the aromatic hydrocarbon compositions, predominantly p-xylene, increased relatively to about 70% in the liquid fraction for the best catalyst (1.25 g of catalyst and 1 wt% iron loading on ZSM-5 at 450 °C).
ISSN:2190-5525
2190-5525
DOI:10.1007/s13203-019-0230-4