Tuning the Facet Proportion of Co<sub>2</sub>C Nanoprisms for Fischer‐Tropsch Synthesis to Olefins
Yunlei An, Tiejun Lin, Kun Gong, Xinxing Wang, Liangshu Zhong, Hui Wang, Yuhan Sun
Abstract
Abstract Cobalt carbide (Co 2 C) exhibits strong facet effect for Fischer‐Tropsch to olefins (FTO) reaction. Herein, we report that the facet proportion of Co 2 C nanostructures can be tuned effectively by incorporating and altering the Mn content in the CoMn composite oxide as catalyst precursor. With the addition of Mn promoter, the Co 2 C nanoprisms with exposed (020) and (101) facets are generated under reaction conditions. In addition, the facet proportion of Co 2 C(020) facet can be effectively improved by enhancing the Mn/Co ratio. With the increase of facet proportion of Co 2 C(020)/Co 2 C(101) ratio, the as‐obtained Co 2 C nanoprisms exhibit higher intrinsic activity and lower methane selectivity during the syngas conversion process. Kinetic experiments also demonstrate that the apparent activation energy (E a ) for CO conversion is significantly reduced as increasing the facet proportion of Co 2 C(020). This work provides a simple and feasible way to tune the exposed facet proportion for the rational design of Co 2 C nanocatalyst for FTO reaction.