Article Link: https://www.sciencedirect.com/science/article/pii/S2451929421006471?via%3Dihub
中文报道：
X-MOL报道：https://www.x-mol.com/news/744363
研之成理推送：https://mp.weixin.qq.com/s/BqiHFA024lsXo_MihTYoww
Our article on “Iridium boosts the selectivity and stability of cobalt catalysts for syngas to liquid fuels” has been published in Chem (Chem 2022, DOI: 10.1016/j.chempr.2021.12.016).
Noble metals function as promoters of cobalt catalysts for Fischer-Tropsch synthesis, a key technology for the production of synthetic fuels from carbon resources such as shale gas, biomass, and coal via syngas (CO/H2), but the understanding of roles of noble metal promoters remains superficial. Two key challenges for Co-based catalysts, i.e., high CH4 selectivity and low catalyst stability, also remain to be solved. Here, we discovered that the noble metal, which stabilizes the hexagonal close-packed phase of Co, can not only enhance the CO conversion but also increase the selectivity of C5+ hydrocarbons by suppressing CH4 formation. Iridium is a particularly efficient promoter, and the confined Ir–Co single-atom alloy shows C5+ selectivity of 95% with CH4 selectivity suppressed to <3% and stability of 1300 h. The modification by Ir modulates surface structures of Co particles, thus tuning their H2/CO adsorption properties and increasing the resistance toward water oxidation.
