Catalytic removal of nitric oxide with hydrogen and carbon monoxide in the presence of excess oxygen

Catalytic NOx removal with H2 in the presence of an excess of oxygen was studied. A Pt/zeolite catalyst has a high NOx conversion efficiency, but has the disadvantages of being strongly poisoned by CO and HCs such as C3H6 and the formation of N2O as a byproduct from NOx. By reducing the oxidation efficiency of Pt, we have developed an improved catalyst, View the MathML source, which has a higher temperature range of NOx conversion and a lower N2O byproduct formation, than conventional Pt catalysts. This idea was supported by IR and XPS data of the catalyst.