Publicação: Evaluating niobia-supported Ni-Fe catalyst for hydrodeoxygenation (hdo) of lignin-derived pyrolysis oils
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CNPQ::ENGENHARIAS::ENGENHARIA QUIMICA::PROCESSOS INDUSTRIAIS DE ENGENHARIA QUIMICA::PROCESSOS INORGANICOS
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Hydrodeoxygenation (HDO) of lignin-derived pyrolysis oils presents a promising pathway for producing renewable, low-carbon liquid fuels. This thesis evaluates the performance of niobium oxide (Nb₂O₅)-supported catalysts in both batch and continuous HDO processes, comparing them with silica-supported catalysts to assess the role of the support in catalytic performance. The study focused on Ni-Fe bimetallic catalysts, investigating the interaction between the two metals and the support to optimize deoxygenation efficiency. In the batch HDO of guaiacol, the 5Ni1Fe/Nb₂O₅ catalyst exhibited the best performance, achieving high selectivity towards cyclohexanol and cyclohexane, emphasizing the synergistic effect between Ni and Fe and the role of Nb₂O₅ acidity in promoting hydrogenation and deoxygenation. In contrast, the 5Ru/Nb₂O₅ catalyst showed the highest conversion rate (55%), but with a preference for hydrogenation rather than complete deoxygenation. For bio-oil HDO, the 5Ni5Fe/Nb₂O₅ catalyst emerged as the most effective, demonstrating moderate hydrogen consumption, low CO₂ production, and efficient deoxygenation. Its ability to balance oxygen removal while retaining carbon makes it a strong candidate for practical bio-oil upgrading. In the continuous reactor HDO tests, the 5Ni1Fe/Nb₂O₅ and 5Ru/Nb₂O₅ catalysts were synthesized using Nb₂O₅ in pellet form to enhance mechanical stability for scale-up. Both catalysts exhibited a tendency toward hydrogenation, with 5Ni1Fe/Nb₂O₅ confirming its superior performance in deoxygenation, validating findings from batch studies and reinforcing its potential for industrial application in sustainable biofuel production.
Abstract
Hydrodeoxygenation (HDO) of lignin-derived pyrolysis oils presents a promising pathway for producing renewable, low-carbon liquid fuels. This thesis evaluates the performance of niobium oxide (Nb₂O₅)-supported catalysts in both batch and continuous HDO processes, comparing them with silica-supported catalysts to assess the role of the support in catalytic performance. The study focused on Ni-Fe bimetallic catalysts, investigating the interaction between the two metals and the support to optimize deoxygenation efficiency. In the batch HDO of guaiacol, the 5Ni1Fe/Nb₂O₅ catalyst exhibited the best performance, achieving high selectivity towards cyclohexanol and cyclohexane, emphasizing the synergistic effect between Ni and Fe and the role of Nb₂O₅ acidity in promoting hydrogenation and deoxygenation. In contrast, the 5Ru/Nb₂O₅ catalyst showed the highest conversion rate (55%), but with a preference for hydrogenation rather than complete deoxygenation. For bio-oil HDO, the 5Ni5Fe/Nb₂O₅ catalyst emerged as the most effective, demonstrating moderate hydrogen consumption, low CO₂ production, and efficient deoxygenation. Its ability to balance oxygen removal while retaining carbon makes it a strong candidate for practical bio-oil upgrading. In the continuous reactor HDO tests, the 5Ni1Fe/Nb₂O₅ and 5Ru/Nb₂O₅ catalysts were synthesized using Nb₂O₅ in pellet form to enhance mechanical stability for scale-up. Both catalysts exhibited a tendency toward hydrogenation, with 5Ni1Fe/Nb₂O₅ confirming its superior performance in deoxygenation, validating findings from batch studies and reinforcing its potential for industrial application in sustainable biofuel production.
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Hydrodeoxygenation, Lignin-derived Pyrolysis Oils, Niobium Oxide (Nb2O5) Supported Catalysts, Industrial Application, Carbon Efficiency, Ru/Nb2O5 Catalyst, Bio-oil, Ni-Fe Bimetallic Catalysts, Guaiacol, Batch and Continuous Processes
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TELIS, Naiara da Costa. Evaluating niobia-supported Ni-Fe catalyst for hydrodeoxygenation (HDO) of lignin-derived pyrolysis oils. 2025. 162 f. Tese (Doutorado em Engenharia Química) – Universidade Federal de Uberlândia, Uberlândia, 2025. DOI http://doi.org/10.14393/ufu.te.2025.249.
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