Photothermal conversion of CO2 into lower olefins at the interface of the K-promoted Ru/Fe3O4 catalyst

Solar-driven conversion of CO2 2 to high-value-added chemicals and fuels offers a practical route to alleviate CO2 2 emissions where photodriven catalytic CO2 2 hydrogenation toward lower olefins is a great challenge due to the crucial bottleneck of C-C coupling. Here, we report a K-promoted Ru/Fe3O4 3 O 4 catalyst that efficiently drives photo- thermal catalytic CO2 2 hydrogenation to lower olefins via the FischerTropsch-to-olefin process, where the production rate reaches 0.63 mmol g- 1 h-1- 1 with the highest olefin/paraffin ratio of 10.2. The formation of Ru-FeOx x at the interface of Ru nanoparticles and the Fe3O4 3 O 4 support plays a decisive role in forming C-C bonds and determining the hydrocarbon products. The photochemical contribution promotes electron transfer at the interface of K-promoted Ru/Fe3O4, 3 O 4 , significantly enhances the activation and dissociation of CO2, 2 , and abruptly inhibits the hydrogenation of olefins. Therefore, the product distribution and selectivity of olefins are distinctly different from those of the thermal catalysis process.