Light olefins are key building blocks for production of many chemical intermediates and polymers in chemical industry

which makes strategically important to produce light olefins directly from non-petroleum syngas resources. It has been found that catalyst carriers significantly affect catalyst performance in CO hydrogenation. A series of Fe-based catalysts on PANI-derived N-containing carbon material

prepared by incipient wetness impregnation at various carbonization temperature

were used to study carbonization temperature on catalytic performance. With the increase of carbonization temperature

both light olefin selectivity and O/P ratio were increased. Fe20/NC-800 catalyst had the highest light olefin selectivity of 41.05%. Catalyst characterization by scanning electron microscope

Raman spectrum and X-ray photoelectron spectrum showed that carbonization temperature increase didn't change carrier structure much

but improved degree of graphitization and decreased total nitrogen content and amount of quaternary nitrogen species. It was also found that amount of pyridinic nitrogen was improved but amount of pyrrole nitrogen species was slightly dropped first and then increased with the increase of carbonization temperature. Moreover

XPS and in situ XRD analysis on surface and bulk structures of catalysts showed that carbonization temperature increase reduced number of high binding energy N species on carrier surface

strengthened electron donating effect on iron

and weakened metal-carrier interaction

which promoted reduction

carbonization and agglomeration of active metal iron and finally enhanced yield of light olefins.