Structural and Functional Designs of Catalysts for Reduction of Nitrogen (I),(II) Oxides

Abstract

Co- and Ag-containing catalysts on structured supports were investigated for use in DeNO_x processes, in particular, in the process of combined reduction of N₂O and NO with carbon monoxide and in selective catalytic reduction of NO with C₂ and C₄ alcohols. It was shown that doping of cobalt–cerium–zirconium oxide with 0.1 wt.% of Pd significantly lowers the temperature for achieving high conversions of N₂O and NO (up to 200–300 °C) in a reaction mixture containing N₂O, NO, CO and O₂. The activity of Ag/Al₂O₃/cordierite catalysts in the selective reduction of nitrogen oxides by ethanol and butanol rises with increasing of Al₂O₃ loading and depends on the optimal silver content added. Silver is associated with the regulation of redox and acid–base properties of the catalyst surface.