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US 2014/0274661 A1Published application
Methods of removing calcium material from a substrate or catalytic converter
AssigneeSteag Energy Services GmbH
InventorsThomas Michael Barnard, V, Albert Joseph Stier, Thies Hoffmann
Life of this patent
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Abstract
Methods of removing or softening calcium material from a substrate (e.g., a catalytic converter) and regenerating a catalytic converter are provided. A substrate (e.g., a catalyst support material) having a calcium containing material (e.g., calcium-containing fly ash) embedded or deposited thereon can be treated with a composition including one or more organosulfur oxoacids or salts thereof.
Claims37
A method of softening or removing a calcium material from a substrate, comprising:
- a. providing a substrate comprising a catalytic converter, said catalytic converter including the calcium material deposited directly or indirectly on at least a portion of the catalytic converter;
- b. treating the catalytic converter with a treatment composition comprising at least one organosulfur oxoacid or salt thereof.
A method of regenerating a catalytic converter, comprising:
- a. providing a catalytic converter having a calcium-containing fly ash deposited thereon;
- b. treating the catalytic converter from step (a) with a treatment composition, said treatment composition comprising at least one organosulfur oxoacid or salt thereof;
- c. directly or indirectly physically removing at least a portion of any remaining calcium-containing fly ash remaining on the catalytic converter;
- d. impregnating the catalytic converter with at least one NOx removal catalyst to provide a regenerated catalytic converter.
1 more element
Dependencies are inferred from the claim text.