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dc.contributor.authorVeksha, Andreien_US
dc.contributor.authorMuhammad Zahin Mohamed Amraden_US
dc.contributor.authorChen, Wen Qianen_US
dc.contributor.authorDara Khairunnisa Mohameden_US
dc.contributor.authorTiwari, Satya Braten_US
dc.contributor.authorLim, Teik-Thyeen_US
dc.contributor.authorLisak, Grzegorzen_US
dc.identifier.citationVeksha, A., Muhammad Zahin Mohamed Amrad, Chen, W. Q., Dara Khairunnisa Mohamed, Tiwari, S. B., Lim, T. & Lisak, G. (2022). Tailoring Fe₂O₃-Al₂2O₃ catalyst structure and activity via hydrothermal synthesis for carbon nanotubes and hydrogen production from polyolefin plastics. Chemosphere, 297, 134148-.
dc.description.abstractFe2O3-Al2O3 catalysts applied for conversion of polyolefin plastic waste into multi-walled carbon nanotubes (MWCNTs) and H2 are typically produced by impregnation, co-precipitation or sol-gel synthesis at atmospheric pressure and temperatures below 100 °C. This study utilized hydrothermal conditions and established the role of precipitating agents (urea, N-methylurea and N,N'-dimethylurea) on properties and catalytic activity of Fe2O3-Al2O3 catalysts (Fe-u, Fe-mu and Fe-dmu, respectively). The precipitating agent played a key role in tailoring the properties, such as crystallization degree, surface area and reducibility. The precipitating agents influenced the yield and outer diameters of MWCNTs but did not affect graphitization degree. Among the synthesized catalysts, Fe-u had the largest surface area and preferential formation of the highly reducible α-Fe2O3 crystalline phase. As a result, Fe-u had the highest activity during conversion of pyrolysis gas from low-density polyethylene (LDPE) into MWCNTs, yielding 0.91 g·g-1-catalyst MWCNTs at 800 °C as compared to 0.42 and 0.14 g·g-1-catalyst using Fe-dmu and Fe-mu, respectively. Fe-dmu favored the growth of MWCNTs with smaller outer diameters. Fe-u demonstrated high efficiency during operation using a continuous flow of pyrolysis gas from a mixture of polyolefins (70 wt% polypropylene, 6 wt% LDPE and 24 wt% high density polyethylene) producing 4.28 g·g-1-catalyst MWCNTs at 3.2% plastic conversion efficiency and a stable H2 flow for 155 min (25-32 vol%). The obtained data demonstrate that the selection of an appropriate precipitating agent for hydrothermal synthesis allows for the production of highly active Fe2O3-Al2O3 catalysts for the upcycling of polyolefin plastic waste into MWCNTs and H2.en_US
dc.description.sponsorshipEconomic Development Board (EDB)en_US
dc.description.sponsorshipNanyang Technological Universityen_US
dc.rights© 2022 Elsevier Ltd. All rights reserved.en_US
dc.subjectEngineering::Environmental engineeringen_US
dc.titleTailoring Fe₂O₃-Al₂2O₃ catalyst structure and activity via hydrothermal synthesis for carbon nanotubes and hydrogen production from polyolefin plasticsen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Civil and Environmental Engineeringen_US
dc.contributor.researchNanyang Environment and Water Research Instituteen_US
dc.contributor.researchResidues and Resource Reclamation Centreen_US
dc.subject.keywordsHydrothermal Synthesisen_US
dc.subject.keywordsMulti-walled Carbon Nanotubesen_US
dc.description.acknowledgementThe authors would like to acknowledge the Nanyang Environment and Water Research Institute, Nanyang Technological University (Singapore) and Economic Development Board (Singapore) for financial support of this research.en_US
item.fulltextNo Fulltext- Environment and Water Research Institute-
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