Stabilized ε-Fe 2 C catalyst with Mn tuning to suppress C1 byproduct selectivity for high-temperature olefin synthesis.

Accurately controlling the product selectivity in syngas conversion, especially increasing the olefin selectivity while minimizing C1 byproducts, remains a significant challenge. Epsilon Fe 2 C is deemed a promising candidate catalyst due to its inherently low CO 2 selectivity, but its use is hindered by its poor high-temperature stability. Herein, we report the successful synthesis of highly stable ε-Fe 2 C through a N-induced strategy utilizing pyrolysis of Prussian blue analogs (PBAs). This catalyst, with precisely controlled Mn promoter, not only achieved an olefin selectivity of up to 70.2% but also minimized the selectivity of C1 byproducts to 19.0%, including 11.9% CO 2 and 7.1% CH 4 . The superior performance of our ε-Fe 2 C-xMn catalysts, particularly in minimizing CO 2 formation, is largely attributed to the interface of dispersed MnO cluster and ε-Fe 2 C, which crucially limits CO to CO 2 conversion. Here, we enhance the carbon efficiency and economic viability of the olefin production process while maintaining high catalytic activity.