Augmented hydrogen production by gasification of ball milled polyethylene with Ca(OH)2 and Ni(OH)2 |
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Authors: | Giovanni Cagnetta Kunlun Zhang Qiwu Zhang Jun Huang Gang Yu |
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Institution: | 1. 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, Tsinghua University, Beijing 100084, China2. School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China |
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Abstract: | PE ball milling pretreatment induces higher H2 production and purity by gasification. Ca(OH)2 reacts at solid state with PE boosting H2 and capturing CO2. Ca(OH)2 significantly reduces methanation side-reaction. 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 pre-treatment is proposed to boost H2 generation during polyethylene gasification. The polymer is co-milled 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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Keywords: | Hydrogen production Gasification Plastic waste High energy ball milling |
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