Abstract
γ‐alumina‐supported catalysts show promise as lean NOx catalysts. The role of alumina in influencing the structural and chemical properties of the active phase supported on it is discussed using some effective alumina‐based lean NOx catalysts. These include Ag/γ‐Al2O3, CoOx/γ‐Al2O3 and SnO2/γ‐Al2O3. Alumina plays an important role in stabilizing Ag in the oxidic phase and cobalt in the 2+ oxidation state. For SnO2/γ‐Al2O3, alumina increases the SnO2 surface area. On both Ag/γ‐Al2O3 and SnO2/γ‐Al2O3, alumina also participates actively in the NOx reduction reaction. An active organic intermediate is formed on Ag or Sn oxide which reacts with NOx subsequently on alumina to form N2.
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