Journal
ADVANCED MATERIALS
Volume 30, Issue 31, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201800527
Keywords
Co-based catalysts; layered double hydroxides; light olefins; photothermal CO hydrogenation
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Funding
- National Key R&D Program of China [2016YFB0600901, 2017YFA0206904, 2017YFA0206900]
- Ministry of Science and Technology of China [2014CB239402]
- National Natural Science Foundation of China [51772305, 51572270, U1662118, 21473229, 91545121]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB17000000]
- Royal Society-Newton Advanced Fellowship [NA170422]
- International Partnership Program of Chinese Academy of Sciences [GJHZ1819]
- National Thousand Young Talents Program of China
- Hundred-Talent Program of Chinese Academy of Sciences
- Shanxi Hundred-Talent Program
- Young Elite Scientist Sponsorship Program by CAST (YESS)
- Youth Innovation Promotion Association of the CAS
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Solar-driven Fischer-Tropsch synthesis represents an alternative and potentially low-cost route for the direct production of light olefins from syngas (CO and H-2). Herein, a series of novel Co-based photothermal catalysts with different chemical compositions are successfully fabricated by H-2 reduction of ZnCoAl-layered double-hydroxide nanosheets at 300-700 degrees C. Under UV-vis irradiation, the photothermal catalyst prepared at 450 degrees C demonstrates remarkable CO hydrogenation performance, affording an olefin (C-2-4(=)) selectivity of 36.0% and an olefin/paraffin ratio of 6.1 at a CO conversion of 15.4%. Characterization studies using X-ray absorption fine structure and high-resolution transmission electron microscopy reveal that the active catalyst comprises Co and Co3O4 nanoparticles on a ZnO-Al2O3 mixed metal oxide support. Density functional theory calculations further demonstrate that the oxide-decorated metallic Co nanoparticle heterostructure weakens the further hydrogenation ability of the corresponding Co, leading to the high selectivity to light olefins. This study demonstrates a novel solar-driven catalyst platform for the production of light olefins via CO hydrogenation.
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