Cobalt carbide (Co2C) was considered as potential catalysts available for large-scale industrialization of transforming syngas (H2 and CO) to clean fuels.Herein,we successfully synthesized Co-based catalysts with MnO supported,to comprehend the effects of Co2C for Fischer-Tropsch synthesis (FTS) under ambient conditions.The huge variety of product selectivity which was contained by different active sites (Co and Co2C) has been found.Furthermore,density functional theory (DFT) shows that Co2C is efficacious of CO adsorption,whereas is weaker for H adsorption than Co.Combining the advantages of Co and Co2C,the catalyst herein can not only obtain more Cs+ products but also suppress methane selectivity.It can be a commendable guide for the design of industrial application products in