Methods of regeneration of SCR catalyst poisoned by phosphorous components in flue gas
AssigneeEvonik Energy Services GmbH
InventorsHans-Ulrich Hartenstein, Thies Hoffmann
Life of this patent
Estimating the term…
Abstract
A method of regeneration of a SCR catalyst for use in high temperature thermal processes such as in a power plant facility burning fossil fuels, bio-based fuels, or a combination thereof, wherein the catalyst is poisoned by phosphorous components in the flue gas and the catalyst is treated using a base, preferably an alkali metal hydroxide.
Claims14
A method of regenerating a phosphorous-poisoned SCR catalyst, the method comprising treating the phosphorous-poisoned catalyst with an alkali metal hydroxide at a pH above 8.5.
A method of regenerating a phosphorous-poisoned SCR catalyst, the method comprising treating the phosphorous-poisoned catalyst with an alkali metal hydroxide at a pH in a range of from above about 10 to about 14 and a temperature up to about 176° F.
A method of cleaning a phosphorous-poisoned SCR catalyst, the method comprising cleaning the phosphorous-poisoned catalyst with an alkali metal hydroxide by immersing the catalyst in a soaking bath, an ultrasonic treatment solution, or a combination thereof, wherein the soaking bath or ultrasonic treatment solution has a pH in a range of from about 10 to about 14 and a temperature in the range from about 60° F. to about 140° F.
Dependencies are inferred from the claim text.