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oai:figshare.com:article/32639652 2026-10-01T16:38:13Z portal_1172 item_type_8 month_year_10_2026

Thermal degradation of plastic and biomass waste for high-value carbon nanotubes and syngas Yuan Zhu (148570) PUREID: 591637404 waste plastics carbon nanotubes IGCCU technology biomass gasification syngas production Confronting the global environmental challenges posed by waste plastics and greenhouse gas emissions, this thesis explores solutions through two main avenues. An in-depth examination of the pyrolysis behaviour of waste plastics was undertaken, followed by the production of carbon nanotubes (CNTs) from these plastics to improve the economic feasibility of waste management processes. In addition, addressing the impediment of CO₂ emissions in the advancement of biomass as a renewable energy source, this research utilises Integrated Carbon Capture and Utilisation (ICCU) technology to enhance traditional biomass gasification methods. The goal is to minimize the impact of CO₂ emissions and transform them into high-value syngas. The pyrolysis characteristic parameters of real-world waste plastics were investigated, followed by a further study on high-value CNTs production by a catalytic-pyrolytic method. A two-step process during the novel IGCCU was carried out, consisting of lignin gasification producing syngas and hydrocarbon vapors, along with a large amount of unfavorable CO₂, and the produced CO₂ was internally absorbed by CaO, and the captured CO₂ was efficiently converted into CO in the presence of H₂. Cost-effective CaO-based materials(waste marble powder) and gasification agents (air) were employed to update the IGCCU technology. The CO selectivity and CO₂ conversion remained stable at 100% throughout all eight cycles, indicating the remarkable stability of this novel technology.<br><br><i>Thesis is embargoed until 31 July 2029</i>.<br><br><br> 2026-10-01T16:38:13Z Text Thesis 10.17034/32639652.v1 https://figshare.com/articles/thesis/Thermal_degradation_of_plastic_and_biomass_waste_for_high-value_carbon_nanotubes_and_syngas/32639652 All Rights Reserved Open Access after 2029-07-31