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- 저자 : 이데이야 앳 시아리프 (검색결과 1 건)
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이데이야 앳 시아리프 강원대학교 대학원(삼척캠퍼스) 2026 국내박사
The worldwide increase of plastic trash, especially polyethylene terephthalate (PET), has raised significant environmental and economic issues. Among emerging strategies, catalytic pyrolysis and hydrodeoxygenation has shown great promise for the direct conversion of PET into valuable aromatic hydrocarbons under thermal conditions. This study investigates the hydrodeoxygenation (HDO) of bis(2-hydroxyethyl) terephthalate (BHET), a model compound representing polyethylene terephthalate (PET) waste, using Ni–Fe bimetallic catalysts supported on γ-Al2O3 synthesized via spray pyrolysis. The objective was to enhance deoxygenation efficiency and aromatic hydrocarbon selectivity under atmospheric pressure conditions. Catalysts with different Ni/Fe ratios were analyzed using XRD, XPS, BET, TPR, and NH₃-TPD to investigate the structural, electrical, and acidic aspects affecting catalytic performance. Among all tested catalysts, Ni5-Fe15 exhibited the highest performance, achieving 99.79% BHET conversion and a 76.57% degree of deoxygenation at 500 °C. GC–MS analysis revealed dominant formation of benzene (37.21 area%), naphthalene (30.21 area%), and biphenyl (13.21 area%), confirming efficient C–O bond cleavage through synergistic Ni–Fe alloy interactions. Gas analysis indicated balanced H2 (47.49 mol%), CO (24.85 mol%), and CO2 (21.60 mol%) selectivity, suggesting concurrent decarbonylation and decarboxylation pathways. The spray pyrolysis synthesis provided uniform metal dispersion and enhanced acidity, resulting in superior catalytic stability and minimized coke formation. Overall, this work establishes Ni–Fe/γ-Al2O3 as a cost-effective and sustainable catalyst for converting PET-derived oxygenated intermediates into valuable aromatic hydrocarbons, contributing to the advancement of green catalysis and circular economy-based plastic recycling technologies. The selective HDO of BHET, a model compound had been tested using bimetallic Pt-Sn/γ- Al2O3 catalysts. The objective was to enhance deoxygenation efficiency and aromatic selectivity under mild, atmospheric conditions. Catalysts with different Pt/Sn ratios (Pt7Sn3, Pt7.5Sn2.5, Pt8Sn2, and Pt8.5Sn1.5) were synthesized using incipient wetness impregnation and studied using XRD, BET, H₂-TPR, NH₃-TPD, SEM-EDX, and XPS to clarify structure–function correlations. The Pt7.5Sn2.5 catalyst exhibited best performance, achieving 100% BHET conversion and a 94.24% degree of deoxygenation at 400 °C, with high selectivity toward benzene (45.42%), ethylbenzene (40.56%), and toluene (7.59%). This optimal behavior results from the synergistic electronic and structural interactions between Pt and Sn, which facilitate C–O bond cleavage while suppressing excessive hydrogenation and cracking. Reaction pathway analysis revealed that BHET transformation proceeds via benzoic acid and benzaldehyde intermediates, leading to fully deoxygenated aromatics. These findings highlight the potential of Pt–Sn/γ-Al₂O₃ catalysts for efficient, low-pressure chemical upcycling of PET-derived compounds. The proposed catalytic strategy provides a sustainable and scalable pathway for transforming polyester waste into valuable aromatic hydrocarbons, contributing to the advancement of circular economy and green chemical recycling technologies. The investigates the selective hydrodeoxygenation (HDO) of dimethyl terephthalate (DMT) a primary PET depolymerization intermediate into benzene, toluene, and xylene (BTX) over Co– Fe/SiO2 catalysts using tetralin as an in situ hydrogen donor. Bimetallic catalysts with varying Co/Fe ratios were synthesized via wet impregnation and characterized by BET, XRD, SEM-EDX, NH₃-TPD, H2-TPR, and XPS to correlate physicochemical properties with catalytic performance. The 5 wt% Co–15 wt% Fe/SiO2 catalyst exhibited the highest efficiency, achieving 99% DMT conversion, 28.9% benzene yield, and 95.1% deoxygenation degree at 450 °C after 1 h. The enhanced activity was attributed to strong Co–Fe alloy interactions that improved reducibility, dispersion, and acid–metal balance, facilitating selective C–O bond cleavage while preserving aromatic rings. Methyl benzoate was identified as a key intermediate, transforming via decarbonylation, decarboxylation, and methylation pathways. Reaction temperature and time significantly influenced selectivity, while tetralin effectively provided hydrogen without external supply. These findings highlight the potential of Co–Fe alloy catalysts and hydrogen-donor solvents to convert PET-derived intermediates into sustainable aromatic chemicals, offering a promising and scalable route for circular carbon utilization and reduced dependence on fossil-based aromatics. The study investigates of catalytic fast pyrolysis of waste polyethylene terephthalate (PET) conducted in a bubbling fluidized-bed reactor, emphasizing the effect of natural dolomite (CaMg(CO3)2) on product distribution and deoxygenation behavior. Calcined dolomite was characterized by XRD, BET, SEM-EDX, ICP-OES, and TGA, confirming its crystalline CaO–MgO phases, mesoporous texture (13.23 m²/g), and bifunctional basic–acidic surface active for C–O bond cleavage. Fast pyrolysis experiments were performed between 475–550 °C and at different fluidization velocities (2.0–3.0×Umf) to evaluate product yields of major products . At optimal conditions (500 °C, 2.5×Umf), catalytic pyrolysis produced a liquid yield of 35.66 wt%, biphenyl yield of 5.53 wt%, and decreased gas yield (37.87 wt%), outperforming non-catalytic reactions. The presence of dolomite increased the aromatic hydrocarbon peak area from 12.89% to 20.15%, enhanced H2 evolution (up to 9.65 mol%), and reduced CO2 selectivity from 51.94 mol% to 41.60 mol%, confirming its role in deoxygenation and CO2 sorption. Elemental analysis and FTIR/UV–Vis spectra of recovered terephthalic acid (rTPA) showed high structural similarity to pure TPA, indicating effective depolymerization and reformation. The study demonstrates that dolomite catalysis promotes deoxygenation and aromatic formation during PET pyrolysis, establishing a sustainable and cost-effective route for plastic waste valorization and green aromatic chemical production.
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