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- [Research] Cutting-Edge Technologies for Converting Waste CO2 into Sustainable Fuels and Chemicals-Mechanical Engineering Prof. KIM
- Carbon dioxide (CO2) is one of the most prominent greenhouse gases contributing to global warming. As the world moves toward carbon neutrality, attention is shifting beyond simply reducing emissions to technologies that convert CO2 back into useful fuels and chemical feedstocks. This process is known as direct CO2 conversion. The three studies introduced here present different catalysts that enable the transformation of CO2 into liquid fuels, such as sustainable aviation fuel, or chemical feedstocks. A common feature among them is the use of hydrogenation reactions—reacting CO2 with hydrogen (H2)—to produce high-value products. 1. Producing Long-Chain Liquid Fuels with an Iron–Zirconia Catalyst The first study developed a catalyst combining iron (Fe) and zirconia (ZrO2) to convert CO2 into long-chain hydrocarbons (C5 and above), which are the primary constituents of liquid fuels such as gasoline and diesel. The catalyst maintained its performance for 750 hours (over a month) under reaction conditions, achieving a world-class C5+ yield of 26%. Zirconia played a multifaceted role—not merely as a support, but also in preventing iron particle agglomeration, enhancing reactivity, and tuning the electronic structure of the active sites. Title: High-yield pentanes-plus production via hydrogenation of carbon dioxide: Revealing new roles of zirconia as promoter of iron catalyst with long-term stability Journal: Journal of Energy Chemistry DOI: https://doi.org/10.1016/j.jechem.2024.11.010 2. Suppressing Methane Formation to Favor Higher Hydrocarbons with a Cobalt–Zirconia Catalyst The second study focused on a cobalt (Co) and zirconia catalyst that suppresses the “methane runaway” phenomenon often observed in CO2 hydrogenation, instead selectively producing C5+ hydrocarbons used in gasoline, kerosene, and diesel. At the Co–ZrO2 interface, CO2 was effectively activated, promoting reaction pathways that favor longer hydrocarbon chains over methane. The catalyst demonstrated long-term stability, indicating strong potential for industrial application. Title: Elucidating the role of ZrO2 in a cobalt catalyst in the direct hydrogenation of CO2 to C5+ hydrocarbons Journal: Journal of Energy Chemistry DOI: https://doi.org/10.1016/j.jechem.2025.05.004 3. Producing Higher Alcohols with a Sodium–Copper–Iron Catalyst The third study introduced a catalyst composed of sodium (Na), copper (Cu), and Fe to convert CO2 into C2+ alcohols (such as ethanol and propanol), which have high value as fuel additives and chemical precursors. Sodium enhanced the surface basicity of the catalyst, facilitating CO2 adsorption and C–C bond formation, while oxygen vacancies in the catalyst structure aided in hydrogen activation. This combination delivered both high selectivity and excellent stability. Title: Tandem reductive hydroformylation: A mechanism for selective synthesis of straight-chain α-alcohols by CO2 hydrogenation Journal: Applied Catalysis B: Environmental and Energy DOI: https://doi.org/10.1016/j.apcatb.2024.124978 Significance and Outlook These studies demonstrate core technologies for carbon neutrality by transforming emitted CO2 from a waste product into valuable fuels and chemical feedstocks. They show compatibility with existing petroleum refining infrastructure while achieving world-leading levels of long-term stability, yield, and selectivity. The research highlights the potential of turning CO2 from an environmental burden into a resource, using relatively common metals like Fe, Co, and Cu, and maximizing efficiency and stability through precise structural and electronic tuning. Beyond laboratory success, these breakthroughs have the potential to reshape the petroleum, petrochemical, and fuel production industries of the future.
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- 작성일 2026-01-05
- 조회수 82