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Augmented hydrogen production by gasification of ball milled polyethylene with Ca(OH)2 and Ni(OH)2

Authors
  • Cagnetta, Giovanni1
  • Zhang, Kunlun1
  • Zhang, Qiwu2
  • Huang, Jun1
  • Yu, Gang1
  • 1 Tsinghua University, State Key Joint Laboratory of Environment Simulation and Pollution Control (SKJLESPC), Beijing Key Laboratory of Emerging Organic Contaminants Control (BKLEOCC), School of Environment, POPs Research Center, Beijing, 100084, China , Beijing (China)
  • 2 Wuhan University of Technology, School of Resources and Environmental Engineering, Wuhan, 430070, China , Wuhan (China)
Type
Published Article
Journal
Frontiers of Environmental Science & Engineering
Publisher
Higher Education Press
Publication Date
Jan 06, 2019
Volume
13
Issue
1
Identifiers
DOI: 10.1007/s11783-019-1096-5
Source
Springer Nature
Keywords
License
Yellow

Abstract

Polymer thermal recycling for hydrogen production is a promising process to recover such precious element from plastic waste. In the present work a simple but efficacious high energy milling pretreatment is proposed to boost H2 generation during polyethylene gasification. The polymer is comilled with calcium and nickel hydroxides and then it is subjected to thermal treatment. Results demonstrate the key role played by the calcium hydroxide that significantly ameliorates hydrogen production. It reacts in solid state with the polyethylene to form directly carbonate and hydrogen. In this way, the CO2 is immediately captured in solid form, thus shifting the equilibrium toward H2 generation and obtaining high production rate (>25 L/mol CH2). In addition, high amounts of the hydroxide prevent excessive methane formation, so the gas product is almost pure hydrogen (~95%).

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