Patent ID: 7666808
Filing Date: 2010-02-23
Classification: B01D,B01J

Abstract:
1. A denitrification-catalyst regeneration method, comprising: denitrifying exhaust gas produced by the combustion of ultraheavy oil with a sulfur content of 1% or higher using a denitrification catalyst, wherein said denitrification step results in the deposit on the surface of the denitrification catalyst of vanadium oxysulfate; then cleaning the resulting used denitrification catalyst having vanadium oxysulfate on its surface with an aqueous solution of sulfuric acid or an aqueous solution of hydrochloric acid, thereby producing a denitrification catalyst from which vanadium oxysulfate has been removed; and then finish-washing said denitrification catalyst with water to regenerate said denitrification catalyst.