Patent ID: 8057767

Claim:
A method of oxidizing nitrogen oxide (NO) to nitrogen dioxide in a gas also containing oxygen, nitrogen, and water, the gas being at a temperature above about 200Â° C.; the method comprising: passing a stream of the nitrogen oxide-containing gas in contact with solid catalyst particles comprising a mixture of MnOx and at least one other base metal oxide selected from the group consisting of cerium oxide (CeO 2 ), yttrium oxide (Y 2 O 3 ), and zirconium oxide (ZrO 2 ), where x has a value of from 1 to 4, the MnOx content is five to ninety mole percent of the mixture of metal oxides, and the at least one other metal oxide makes up the balance of the mixture of metal oxides, the nitrogen oxide-containing gas being in contact with the catalyst particles for a time suitable for oxidizing at least a portion of the NO to NO 2 .