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- Title
Reactivity of carbon dioxide during pyrolysis of paper-plastic composite.
- Authors
Kim, Jung-Hun; Lee, Dong-Jun; Lee, Taewoo; Kim, Jee Young; Tsang, Yiu Fai; Kwon, Eilhann E.
- Abstract
Composite materials have been widely used because of their superior properties compared to those of the original material. Separation of the constituent materials is not easy in the recycling process, and such an effort lowers economic viability. As such, this study employed a pyrolysis as a valorizing method for the composite material. Disposable paper cup waste (DPCW) was chosen as the model compound for paper-plastic composites. To offer green/sustainable features, CO2 was employed as a raw and reactive material in the pyrolysis process. It was proved that DPCW primarily composed of cellulose (outer layer) and polyethylene (inner layer). In the single-stage and multistage pyrolysis of DPCW, the CO2 reactivity in the homogeneous reaction of CO2 and DPCW-derived volatiles was not rapid. To accelerate the reaction kinetics governing the reactivity of CO2, the catalytic pyrolysis of DPCW over Ni/SiO2 was performed. The formation of syngas increases significantly, suggesting that CO2 reactivity was catalytically enhanced. The generation of syngas (enhanced by CO2) was inversely related to the DPCW oil generation, indicating that more carbon was assigned from the oil to the gaseous pyrogenic products. The study results would offer a strategic means to valorize paper-plastic composites and CO2 into energy through pyrolysis.
- Subjects
CARBON dioxide; PYROLYSIS; WASTE paper; WASTE recycling; RAW materials
- Publication
Cellulose, 2024, Vol 31, Issue 6, p3447
- ISSN
0969-0239
- Publication type
Article
- DOI
10.1007/s10570-024-05805-z