Honeycomb filters comprising activated carbon and methods of making the same

A method of making a honeycomb filter, the method comprising:

• forming a shapable honeycomb precursor composition comprising a cross-linked resin, wherein the cross-linked resin comprises from 0.5 wt. % to 4 wt. % nitrogen based on the total weight of the cross-linked resin;
• shaping the honeycomb precursor composition to form a honeycomb green body having a plurality of parallel cell channels bounded by porous channel walls traversing the honeycomb green body from an upstream inlet end to a downstream outlet end;
• heat treating the honeycomb green body to carbonize the cross-linked resin and form a carbonized honeycomb green body;
• and
• activating the carbonized honeycomb green body to produce the honeycomb filter comprising an activated carbon honeycomb body having a plurality of parallel cell channels bounded by porous channel walls traversing the body from an upstream inlet end to a downstream outlet end,
• wherein the activated carbon honeycomb body comprises activated carbon comprising from 1 wt. % to 50 wt. % nitrogen based on the total weight of the activated carbon.

A method of making a honeycomb filter, the method comprising:

• forming a honeycomb precursor composition comprising a cross-linked resin, wherein the cross-linked resin comprises from 0.5 wt. % to 4 wt. % nitrogen based on the total weight of the cross-linked resin;
• heat treating the honeycomb precursor composition to carbonize the cross-linked resin and form a carbonized honeycomb precursor composition;
• activating the carbonized honeycomb precursor composition to produce an activated honeycomb precursor composition;
• and
• shaping the activated honeycomb precursor composition to form the honeycomb filter comprising an activated carbon honeycomb body having a plurality of parallel cell channels bounded by porous channel walls traversing the body from an upstream inlet end to a downstream outlet end,
• wherein the activated carbon honeycomb body comprises activated carbon comprising from 1 wt. % to 50 wt. % nitrogen based on the total weight of the activated carbon.