Recycling and Resource Recovery from Polymers III

A special issue of Polymers (ISSN 2073-4360). This special issue belongs to the section "Circular and Green Polymer Science".

Deadline for manuscript submissions: closed (25 March 2024) | Viewed by 1186

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Guest Editor
WASM: Minerals, Energy and Chemical Engineering, Curtin University, Curtin, Australia
Interests: energy and emission reductions in process metallurgy, pelletisation, decarbonising cement and iron ore reduction; biomass and waste utilisation in process metallurgy, dewatering, carbon reforming, polymers for carbon reduction; polymers for sustainable materials processing; recycling
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Special Issue Information

Dear Colleagues,

Following the success of the Polymers Special Issues “Recycling and Resource Recovery from Polymers” and “Recycling and Resource Recovery from Polymers II”, we are delighted to reopen this Special Issue, now entitled “Recycling and Resource Recovery from Polymers III”.

About 90% of the 300 million tonnes of plastics produced each year is not recycled and disposed of in landfills, posing significant environmental concerns. By 2030, 104 Mt of waste plastics are projected to enter landfills, causing a 50% increase in CO2 emissions via the plastic life cycle and a three-fold CO2 increase caused by plastic incineration due to poor waste management. A zero-waste approach conserves natural resources and reduces pollution from extraction, manufacturing and disposal. The goal of a new circular economy under a plastics initiative is supported by three key actions: eliminate, innovate and circulate. This Special Issue will focus on current and future research concerning the repurposing of plastics at the end of their life for various applications.

Dr. Sheila Devasahayam
Guest Editor

Manuscript Submission Information

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Keywords

  • circular economy/plastics
  • economy energy recovery
  • monomer recovery
  • hydrogen energy systems
  • emissions reduction
  • carbon capture
  • carbon conversion reactions
  • gasification
  • novel cataslysts
  • feedstock recycling
  • sustainable materials processing (e.g., iron and steel industry)
  • polymer wastes in geopolymer concrete (construction, built materials)
  • process modelling
  • economic analysis

Published Papers (1 paper)

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Research

18 pages, 2232 KiB  
Article
Valorisation of Sub-Products from Pyrolysis of Carbon Fibre-Reinforced Plastic Waste: Catalytic Recovery of Chemicals from Liquid and Gas Phases
by Esther Acha, Naia Gastelu, Alexander Lopez-Urionabarrenechea and Blanca María Caballero
Polymers 2024, 16(5), 580; https://doi.org/10.3390/polym16050580 - 21 Feb 2024
Viewed by 644
Abstract
Waste carbon fibre-reinforced plastics were recycled by pyrolysis followed by a thermo-catalytic treatment in order to achieve both fibre and resin recovery. The conventional pyrolysis of this waste produced unusable gas and hazardous liquid streams, which made necessary the treatment of the pyrolysis [...] Read more.
Waste carbon fibre-reinforced plastics were recycled by pyrolysis followed by a thermo-catalytic treatment in order to achieve both fibre and resin recovery. The conventional pyrolysis of this waste produced unusable gas and hazardous liquid streams, which made necessary the treatment of the pyrolysis vapours. In this work, the vapours generated from pyrolysis were valorised thermochemically. The thermal treatment of the pyrolysis vapours was performed at 700 °C, 800 °C and 900 °C, and the catalytic treatment was tested at 700 °C and 800 °C with two Ni-based catalysts, one commercial and one homemade over a non-conventional olivine support. The catalysts were deeply characterised, and both had low surface area (99 m2/g and 4 m2/g, respectively) with low metal dispersion. The thermal treatment of the pyrolysis vapours at 900 °C produced high gas quantity (6.8 wt%) and quality (95.5 vol% syngas) along with lower liquid quantity (13.3 wt%) and low hazardous liquid (92.1 area% water). The Ni–olivine catalyst at the lowest temperature, 700 °C, allowed us to obtain good gas results (100% syngas), but the liquid was not as good (only 58.4 area% was water). On the other hand, the Ni commercial catalyst at 800 °C improved both the gas and liquid phases, producing 6.4 wt% of gas with 93 vol% of syngas and 13.6 wt% of liquid phase with a 97.5 area% of water. The main reaction mechanisms observed in the treatment of pyrolysis vapours were cracking, dry and wet reforming and the Boudouard reaction. Full article
(This article belongs to the Special Issue Recycling and Resource Recovery from Polymers III)
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