On board catalytic NO sub(x) control: mechanistic aspects of the regeneration of Lean NO sub(X) Traps with H sub(2)

In this paper the results obtained in our previous studies on the reduction of nitrates by H sub(2) over Pt-Ba/Al sub(2)O sub(3) catalyst samples are presented and discussed along with new data recently collected in order to explain the chemistry that leads to nitrogen and ammonia evolution during the regeneration of Lean NO sub(x) Traps.