Promotion of Mn Doped Co/CNTs Catalysts for CO Hydrogenation to Light Olefins

With various contents, Mn was introduced into carbon nanotubes (CNTs) supported cobalt catalysts and the obtained Mn‐Co/CNTs catalysts were investigated for CO hydrogenation to light alkenes and characterized by N 2 adsorption, X‐ray diffraction (XRD), X‐ray photoelectron spectra (XPS), H 2 temperature programmed reduction (TPR), CO temperature programmed desorption (TPD) and transmission electron microscope (TEM). The results indicate that the addition of a small amount of Mn (0.3 wt%) to CNTs‐supported Co catalyst significantly increased the selectivity of C 2 –C 4 olefins and decreased the selectivity of CH 4 . However, with further addition of Mn to the cobalt catalysts, the CH 4 selectivity decreased obviously along with the increase of the C 5+ selectivity. Compared with the unpromoted catalysts, the Mn‐promoted cobalt catalysts increased the C 2 –C 4 /C 2 0 –C 4 0 molar ratio.