Method for unblocking pores in a selective catalytic reduction catalyst

A method for unblocking pores blocked by obstructions, inside a selective catalytic reduction (SCR) catalyst comprising a zeolite, whereby the SCR catalyst is contained inside a muffler which is part of an exhaust after treatment system (EATS) of a vehicle, wherein the method includes:

• filling in which a liquid is introduced inside the muffler so as to fully immerse each SCR catalyst into the liquid;
• soaking during which a proportion of the liquid introduced inside the muffler spreads into the pores of the zeolite;
• draining, at which the excess of liquid introduced inside the muffler is removed out of the muffler;
• and
• drying, at which the SCR catalyst is heated at a temperature above an ebullition temperature of the liquid so as to vaporize the liquid remaining in the pores and generate steam flows through the obstructions, the steam flows removing the obstructions and unblocking the pores, and wherein no hydrocarbons are injected during the drying.