Patent ID: 7858549

Claim:
A method for removing iron from a denox catalyst, comprising the steps of: analyzing the denox catalyst for iron content; and placing the denox catalyst in an acidic solution of at least one inorganic or organic acid and at least one antioxidant to remove at least a portion of the iron on the denox catalyst, wherein the at least one organic acid is selected from the group consisting of oxalic acid, citric acid, malonic acid, formic acid, chloroacetic acid, and benzene sulfonic acid, and the at least one antioxidant is selected from the group consisting of substituted phenols, hydroquinones, catechols, aliphatic mercapto compounds, araliphatic mercapto compounds, aromatic mercapto compounds, dithiocarbonates, hydroxycarboxylic acids, enediols, phosphites, and phosphonates.