Photo-Driven Syngas Conversion to Lower Olefins over Oxygen-Decorated Fe5C2 Catalyst

Abstract

With the depletion of crude oil and especially the growing demand for lower olefins, the FTO process is a promising alternative for the petroleum route. In this work, a photo-driven FTO process was realized over Fe 5 C 2 catalyst under photoirradiation. The unique slight oxygen-modulated Fe 5 C 2 structure formed in situ under the photo-irradiation condition, resulting in high selectivity to olefins, making it an excellent catalyst in photo-driven FTO reaction. SUMMARYWith the depletion of crude oil and especially the growing demand for lower olefins, the direct conversion of syngas into lower olefins via the Fischer-Tropsch to olefins (FTO) process is a promising alternative for the petroleum route. A photo-driven FTO process can dramatically change the product selectivity over Fe 5 C 2 catalyst, leading to an olefin/paraffin ratio of 10.9 with CO conversion >49%. The selectivity toward CO 2 was as low as 18.9%, ensuring a high carbon resource utilization efficiency, and the catalyst showed good stability. Under the photo-irradiation condition, the surface of the Fe 5 C 2 catalyst was spontaneously decorated by O atoms formed in situ, resulting in a high selectivity to olefins, which makes it an excellent catalyst for photo-driven FTO reaction.

Iron Carbides: Control Synthesis and Catalytic Applications in COx Hydrogenation and Electrochemical HER

“…However, the surface of FeC x NPs is sensitive to oxidative atmosphere. Once exposed to air, the FeC x surface is easily coated with FeO x shell . FeC x was reported to possess outstanding magnetism and high adsorption of near infrared (NIR) light due to the presence of carbon atoms.…”

“…Compared to the traditional thermal catalytic process, photodriven CO x transformation provides a sustainable approach to harvest the most abundant energy in nature to obtain desired fuels and chemicals . Recently, a novel photodriven Fischer–Tropsch to olefins (FTO) process was realized over Fe 5 C 2 catalyst, which showed an olefin/paraffin (o/p) ratio of 10.9 under the CO conversion of ≈49% as well as low CO 2 selectivity (18.9%) ( Figure a) . Significantly different product distributions were observed under photodriven and thermal reactions.…”

“…a) Schematic illustration of the photodriven CO hydrogenation to olefins over Fe 5 C 2 catalysts. Reproduced with permission . Copyright 2018, Elsevier.…”

Von Sonnenlicht zu Brennstoffen: aktuelle Fortschritte der C1‐Solarchemie

“…À1 .Die molare Stçchiometrie von entwickeltem CO 2 und H 2 betrug in den frühen Stadien der photokatalytischen Reaktion etwa 1:1, was der Erwartung fürd ie WGS-Reaktion entspricht (Abbildung 7a). [104] Copyright 2018, Elsevier. Es wurden zwei photokatalytische Mechanismen vorgeschlagen, die von der Energie der anregenden Photonen abhängen (Abbildung 7b).…”

“…15 %, C 5+ :8 2%). [ [103] und sauerstoffdekorierte Fe 5 C 2 -Heterostrukturen, [104] weisen eine ausgezeichnete FTO-Aktivitätu nter Lichtbestrahlung auf.B eispielsweise zeigte der nach H 2 -Reduktion von ZnFeAl-LDH-Nanoblättern bei 500 8 8Ce rhaltene Katalysator (Fe-500), der aus Fe 0 und FeO x -NPs auf einem ZnAl-MMO-Träger bestand, eine bemerkenswerte CO-Hydrierungsleistung mit einer sehr hohen Anfangsselektivitätf ürK ohlenwasserstoffe (89 %) und insbe-Abbildung 4. Lichtabhängigkeit a) der katalytischenAktivitätund b) der Selektivitätv on Ru/Graphen für photokatalytische FTS.…”