Effect of MgFe-LDH with Reduction Pretreatment on the Catalytic Performance in Syngas to Light Olefins

MgFe-layered double hydroxides (LDH) were widely used as catalysts for Fischer–Tropsch synthesis to produce light olefins, in which the state of Fe-species may affect resulting catalytic active sites. Herein, typical MgFe-LDH was hydrothermally synthesized and obtained pretreated with H2 at different temperatures reveal effects on performance synthesis. materials characterized by X-ray diffraction (XRD), N2 adsorption–desorption, scanning electron microscopy (SEM), transmission (TEM), temperature-programmed reduction (H2-TPR), photoelectron spectroscopy (XPS). It found that a MgO-FeO solid solution would be formed increase temperature, made electrons transfer from Mg atoms Fe strengthened adsorption CO. The pre-reduced treatment toward Mg-Fe-LDH enabled FeCx sites easily situ during reaction process, leading high conversion CO2 desorption (CO2-TPD) (H2-TPD) analysis confirmed surface basicity increased hydrogenation capacity weakened, secondary olefins inhibited, therefore enhancement O/P product selectivity (42.7%).