Methods of plugging a permeable porous cellular body

A method of plugging a permeable porous cellular body, comprising:

• contacting the permeable porous cellular body with a plugging mixture, the permeable porous cellular body defining a plurality of channels;
• forcing the plugging mixture into at least one channel of the plurality of channels with a plunger at a constant displacement rate of the plunger until a maximum, self-limiting, depth of the plugging mixture is disposed within the plurality of channels;
• and
• calcining the plugging mixture in the permeable porous cellular body by heating the plugging mixture in the permeable porous cellular body to a first temperature in a range from about 350° C. to about 600° C.

A method of plugging a permeable porous cellular body, comprising:

• contacting the permeable porous cellular body with a plugging mixture, the permeable porous cellular body defining a plurality of channels;
• and
• forcing the plugging mixture into the plurality of channels with a plunger at a constant displacement rate of the plunger until a pressure on the plugging mixture increases to a predetermined pressure and a maximum, self-limiting, depth of plugging mixture less than about 30 mm is disposed within the plurality of channels, or
• forcing the plugging mixture into the plurality of channels with the plunger at a constant pressure on the plugging mixture such that a displacement rate of the plunger decreases from an initial displacement rate to a predetermined displacement rate and a maximum, self-limiting, depth of plugging mixture less than about 30 mm is disposed within the plurality of channels.