Unleashing The Full Potential of Photo-Driven Co Hydrogenation to Light Olefins Over Carbon-Coated CoMn-Based Catalysts.

As a nonpetroleum process, photo-driven Fischer-Tropsch synthesis provides a practical approach for the synthesis of light olefins. However, maximizing the solar energy conversion efficiency based on the design of composite catalyst and understanding catalytic mechanism remain challenging. Herein, a novel carbon-coated CoMn-based catalysts, C-coated mixture of Co and MnO, is designed for the efficient conversion of syngas to light olefins under light irradiation. The CoMnC-450 catalyst exhibited a CO conversion of 12.6% with a selectivity to light olefins of 36.5% under light irradiation, showing 5.5-fold the activity of thermocatalysis. Experimental characterizations ascertain CoMnC-450 catalyst can be excited to generate photogenerated carriers under light irradiation and then the electron transfer to metallic Co to form electron-rich active sites with carbon mediation, thereby enhancing the catalytic performance. In situ Fourier transform infrared spectroscopy and theoretical calculation based on density functional theory reveal the unique roles of photogenerated carriers in promoting the adsorption and activation of CO molecule. This study demonstrates a feasible catalyst model to efficiently utilize full-spectral solar light to produce the value-added chemical. This article is protected by copyright. All rights reserved.