Ag promoted porous Fe3O4 microspheres with tunable pore size were synthesized via one-pot solvothermal
method and employed as catalysts for Fischer–Tropsch synthesis. The introduction of Ag played an important
role in regulating the pore size of catalysts and the dispersion of Fe. Comparable to unmodified catalyst in this
system, Ag promoted Fe-based catalysts displayed excellent selectivity to lower olefins, particularly for Fe–
0.9Ag with smaller pore size of 1.33 nm and Fe dispersion of 10.1%. The maximum selectivity to C2 through C4
olefins was 43.0 wt.%, and the selectivity to CH4 was low to 14.8 wt.%.