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Converting Waste Plastic to Liquid Organic Hydrogen Carriers
Mahdokht Soltani1, Julie E Rorrer1
1Department of Chemical Engineering, University of Washington, Seattle, 3781 Okanogan Ln, Seattle, WA 98195, USA.
This study presents a novel catalytic system to convert plastic waste into liquid organic hydrogen carriers (LOHCs) for efficient hydrogen storage. This approach tackles plastic pollution and advances clean energy solutions.
Area of Science:
- Chemical Engineering
- Materials Science
- Environmental Science
Background:
- Plastic waste accumulation poses significant environmental and global warming challenges.
- Current chemical recycling methods primarily yield fuels, lubricants, or monomers.
- Developing circularity for synthetic polymers requires innovative waste management technologies.
Purpose of the Study:
- To develop a catalytic system for converting oxygen-containing aromatic plastic waste into liquid organic hydrogen carriers (LOHCs).
- To assess the potential of these LOHCs for hydrogen storage and release.
- To offer a sustainable solution for plastic waste and clean energy generation.
Main Methods:
- Utilized Ru-ReOx/SiO2 catalysts with zeolite HZSM-5 as a co-catalyst.
- Employed direct hydrodeoxygenation (HDO) of oxygen-containing aromatic plastic wastes.
- Conducted dehydrogenation tests of cycloalkanes over Pt/Al2O3 to validate hydrogen generation.
Main Results:
- Successfully converted plastic waste into cycloalkanes, functioning as LOHCs.
- Achieved a theoretical hydrogen capacity of approximately 5.74 wt% under mild conditions.
- Demonstrated efficient hydrogen gas generation from the LOHCs via dehydrogenation.
Conclusions:
- The developed catalytic system offers a viable route for plastic waste valorization.
- The LOHCs produced are effective for hydrogen storage and transportation.
- This approach contributes to mitigating plastic pollution and advancing hydrogen energy technologies.
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