Processing of mixed-plastic waste to fuel oil, carbon nanotubes and hydrogen using multi–core reactor

[Display omitted] •A novel multi-core reactor to produce H2 & CNTs from mixed plastic waste is proposed.•H2 of 78 vol.% and 6.63g CNTs would yield using 60g plastic and 1g of catalyst.•Recycle ratio of 50% has considerable effect over H2 & other product gases.•HRTEM analysis reveals that abo...

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Bibliographic Details
Published in:	Chemical engineering and processing Vol. 121; pp. 205 - 214
Main Authors:	Bajad, Ganesh, Vijayakumar, R.P., Rakhunde, Prajwal, Hete, Amit, Bhade, Mahesh
Format:	Journal Article
Language:	English
Published:	Elsevier B.V 01-11-2017
Subjects:	Carbon nanotubes Hydrogen–rich gases Mixed plastic waste Multi–core reactor Pyrolysis Carbon nanotubes Pyrolysis Mixed plastic waste Hydrogen–rich gases Multi–core reactor
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Summary:	[Display omitted] •A novel multi-core reactor to produce H2 & CNTs from mixed plastic waste is proposed.•H2 of 78 vol.% and 6.63g CNTs would yield using 60g plastic and 1g of catalyst.•Recycle ratio of 50% has considerable effect over H2 & other product gases.•HRTEM analysis reveals that above 70% recycle ratio produces bamboo structured CNTs. Conversion of mixed–plastic waste into carbon nanotubes (CNTs) and hydrogen–rich hydrocarbon gases was carried out in a multi–core reactor using Ni/Mo/MgO catalyst. The mixed plastic waste consisted of HDPE (67.2wt%), PP (11.2wt%), PS (6.2wt%), PVC (5.2wt%) and PET (10.2wt%). Optimization of process parameters such as pyrolysis temperature, CNT synthesis temperature, reaction time and recycle ratio were carried out using Box–Behnken 3–level and 4–factorial design method. The result shows that CNTs of 6.63g and hydrocarbon gases containing 78% hydrogen would yield using 60g plastic waste and 1g of catalyst. Recycle ratio and pyrolysis temperature have shown the considerable effect over the yield of CNTs and product gases. The HRTEM analysis indicates that CNTs with aligned graphene walls can be produced at 50% recycle ratio, while 70% recycle ratio produces CNTs with bamboo like structure. High recycle ratio results in an increase of CO/CO2 concentration with reduction of CNTs and hydrogen yield.
ISSN:	0255-2701 1873-3204
DOI:	10.1016/j.cep.2017.09.011