Catalysts play an important role in

Catalysts play an important role in this reaction. Iron catalysts (FeO, Fe2O3)
with added promoters like oxides of aluminium, calcium, potassium, silicon,
and magnesium are used (Reed, 2002, p. III-250).
Because the gasification of biomass yields syngas, which contains both CO
and H2, for production of ammonia, the syngas must first be stripped of its CO
through the shift reaction (Eq. 9.2). As mentioned earlier, the shift conversion
is aided by commercial catalysts, such as iron oxide and chromium oxide, that
work in a high-temperature range (350–475 °C); zinc oxide–copper oxide catalysts
work well in a low-temperature range (200–250 °C).
In a typical ammonia synthesis process, the syngas is first passed through
the shift reactor, where CO is converted into H2 and CO2 following the shift
9.4.4 Glycerol Synthesis