Effect of calcination temperature on structure and catalytic performance of Fe-Mn catalysts for synthesis of light olefins from syngas

A group of co-precipitated Fe-Mn catalysts were prepared using different calcinaton temperatures and characterized by XRD,BET and H2-TPR techniques,while their catalytic properties in the synthesis of light olefins via carbon monoxide hydrogenation were investigated in a fixed-bed reactor.The results showed that the increase of calcination temperature increased the crystallite size of α-Fe2O3 and decreased the specific surface area of the catalysts.Calcining the catalysts at higher temperature could improve the activity stability of the catalysts,decrease the selectivity to methane,and promote the chain propagation.The catalyst calcined at 450℃ showed the highest selectivity and good yield for light olefins.