Methods of making honeycomb bodies having inorganic filtration deposits

A filtration article comprising:

• a honeycomb body comprised of a plurality of intersecting porous walls comprised of surfaces which define a plurality of channels extending from an inlet end to an outlet end, wherein the plurality of channels comprises inlet channels, which are sealed at locations spaced away from the inlet end, and outlet channels, which are sealed at locations spaced away from the outlet end;
• and
• a porous inorganic network of refractory metal oxide nanoparticles disposed on, or in, or both on and in, at least some of the walls defining the inlet channels,
• wherein the refractory metal oxide nanoparticles are bound by a high temperature binder comprising one or more inorganic components,
• wherein a clean filtration efficiency of the filtration article is greater than or equal to 70% as measured by a clean filtration efficiency test;
• and
• wherein the filtration article is moisture resistant such that the clean filtration efficiency of the article does not change by more than 5% after being exposed to;
• a water soak test, a water immersion test, a water nebulizer test, or combinations thereof.