Spatially resolved operando 57Fe Mössbauer spectroscopy (MS) studies of iron-based catalysts

The 57Fe synchrotron Mössbauer source (SMS) will be used for spatially resolved operando Mössbauer spectroscopy (MS) of iron-based catalysts. This is to profile iron-phase (metallic iron, carbides and oxides) evolution along the catalyst bed, under conditions typical of low- (LT), medium- (MT) and high-temperature (HT) Fischer-Tropsch synthesis (FTS). FTS entails appropriate CO + H2 syngas mass flow rates, at up to 20 bar, and from 500 K (LT-FTS) to 620 K (HT-FTS). 57Fe MS plays a significant role in characterizing iron-based catalysts, yet to the best of our knowledge there are no such spatially resolved operando investigations under FTS conditions.