사업단 성과
사업단 성과
분야 CO₂ hydrogenation
학술지구분 Q1
JCR 20.4%
Enhancing CO2 hydrogenation via spatially engineered bifunctional catalysts: Toward selective C8–10 aromatics for sustainable aviation fuel 친환경물질에너지센터 나경수 / 참여교원
교신저자 나경수
출판일 2026-02-01
저널명 Catalysis Today

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Abstract

The direct CO2 hydrogenation into liquid-phase hydrocarbons offers a sustainable route for carbon recycling, yet achieving high selectivity toward sustainable aviation fuel-range aromatic compounds remains challenging. Here, we report a bifunctional catalyst system composed of FeK-loaded CuAl2O4-based catalyst (FeK/CAO) and a nanosheet MFI-type zeolite (NS-HMFI) with hierarchical porosity for the selective production of C8–10 aromatic hydrocarbons. Structural and compositional characterizations confirmed the mesoporous architecture and strong acidity of NS-HMFI and the multifunctional activity of FeK/CAO in CO2 activation and C–C coupling. By engineering the spatial proximity between the two catalysts through four integration methods such as physical mixture (PM), granule mixture (GM), dual-bed system (DB), and multi-bed system (MB), we elucidated the relationship between proximity and catalytic performance. Among the systems tested, the GM system achieved the highest CO2 conversion (39.2 %) with the lowest CO selectivity (13.0 %) due to enhanced CO2 adsorption and dissociation facilitated by potassium migration and increased surface basicity. Conversely, the DB system, with minimal catalyst proximity, promoted the highest aromatic distribution and enabled selective conversion of light olefins into C8–10 aromatics. All systems integrating NS-HMFI showed >95 % distribution for C8–10 aromatics among total aromatics, highlighting the critical role of external acid sites in mesoporous zeolites. This work demonstrates a proximity-controlled catalytic approach for efficient CO2 hydrogenation to SAF-range aromatics and provides mechanistic insights into the design of multifunctional hybrid catalysts.