Method for the regeneration of phosphor-laden denox catalysts
OwnerAlexander Schluttig, Marcel Foersterinventors
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Abstract
The invention relates to a method for the regeneration of deNOx catalysts with a reduced activity caused by the accumulation of phosphor and phosphorous compounds. The method is characterized in that the catalysts are treated with an essentially aqueous solution of water-soluble alkaline reacting alkaline earth salts, ammonium hydroxide, or alkaline reacting ammonium salts, or water-soluble organic amines with an approximate pK value ranging between 2.5 and 5.5 and that the excess alkali is neutralized by subsequent treatment with inorganic or organic acids.
Claims16
1-15. (canceled)
A method for the regeneration of denox catalysts with reduced activity based on the accumulation of phosphorous and phosphorous compounds, comprising the steps of:
- (i) treating the catalysts with a substantially aqueous solution of water-soluble, alkalinely reacting alkaline earth salts, ammonium hydroxide or alkalinely reacting ammonium salts or water-soluble organic amines with a pH between approximately 2.5 and 5.5,
- (ii) neutralizing excess alkali by a subsequent treatment with inorganic or organic acids, and
- (iii) treating the catalyst with an ultrasonic treatment or treating the catalyst with low-frequency oscillations in the reaction solution, so that regeneration of the denox catalysts is effected.
Dependencies are inferred from the claim text.