Significant Promotion Effect of Mo Additive on a Novel Ce–Zr Mixed Oxide Catalyst for the Selective Catalytic Reduction of NO_<i>x</i> with NH₃

Abstract

A novel Mo-promoted Ce–Zr mixed oxide catalyst prepared by a homogeneous precipitation method was used for the selective catalytic reduction (SCR) of NO_<i>x</i> with NH₃. The optimal catalyst showed high NH₃-SCR activity, SO₂/H₂O durability, and thermal stability under test conditions. The addition of Mo inhibited growth of the CeO₂ particle size, improved the redox ability, and increased the amount of surface acidity, especially the Lewis acidity, all of which were favorable for the excellent NH₃-SCR performance. It is believed that the catalyst is promising for the removal of NO_<i>x</i> from diesel engine exhaust