Dual-temperature photothermal tandem catalysis for CO2 conversion to olefins

Abstract

We report a dual-temperature photothermal tandem system that overcomes temperature mismatch for CO₂ hydrogenation to light olefins in a single reactor. A graphene-modified In₂O₃ top bed enables higher-temperature RWGS, and a K-doped Fe₂O₃ bottom bed facilitates lower-temperature FTS. This vertical configuration couples the two reactions, achieving a light-olefin production rate of 52.1 µmol g⁻¹ h⁻¹ with 69% selectivity at 0.05 MPa without external heating.