Light intensity–directed selective CO 2 photoreduction using iron(0)– zirconium dioxide photocatalyst Tomoki Oyumi , Yasuo Izumi Chiba University, Japan Photocatalytic CO 2 reduction is expected a potential environmental solution for a sustainable society, establishing a new C-neutral cycle. Among the primary transition metals, Fe is the most abundant and cost-effective, but almost all reported systems use Fe in the form of metal ions that act primarily as redox mediators within organometallic frameworks, covalent organic frameworks, porphyrins, or Fe 2 O 3 . In this work, the photoreduction of isotopically labelled 13 CO 2 by Fe 0 -ZrO 2 photocatalysts was carried out under UV-visible light irradiation at 110 mW cm -2 , only the photoreduction of 13 CO 2 to 13 CO proceeded after 5 h of reaction. Increasing the UV-visible light intensity to 322 mW cm -2 switched to the reduction of 13 CO 2 to 13 CH 4 , and further increasing the UV-visible light intensity to 472 mW cm -2 induced a selective photoreduction to 13 C 2,3 paraffins (15 mol%) after 20 h of reaction. FTIR measurements showed that Fe 0 nanoparticles sequentially reduced COH transferred from the ZrO 2 surface to CH x species and hydrocarbons. In situ XAFS measurements indicated that the photo-induced heating of the Fe 0 nanoparticles up to 452 K promoted the sequential reduction to CH 4 , C 2 H 6 , and C 3 H 8 . References 1. Tomoki Oyumi, Ikki Abe, Masahito Sasaki, and Yasuo Izumi, Light intensity–directed selective CO 2 photoreduction using iron(0)–zirconium dioxide photocatalyst, Chemical Communications , web released (2025). DOI: 10.1039/D5CC01147G
P72
© The Author(s), 2025
Made with FlippingBook Learn more on our blog