The study on mechanism of thermostability of wustite-based ammonia synthesis catalyst

Commercial catalysts were characterized by SEM and XRD. The dendrites of catalysts were clear. Some promoters were solid-solute in crystallites uniformly in the form off-phase, which blocked the crystallites from growing to improve the activity and thermostability of the catalyst. The reduced catalyst is an (alpha+f) multi-phase porous alloy. The larger specific surface area and the more active position resulted in excellent activity of catalysts.