Patent ID: 8959773
Filing Date: 2015-02-24
Classification: B01D,C04B,F01N,Y02T,Y10T

Abstract:
1. A method of making a wall flow membrane filter, the method comprising: selecting a honeycomb body comprising an array of open-ended through-channels separated by porous channel walls that have first pores of a first pore size; masking a first subset of the channels at one or both ends of the body to form a masked body; applying a membrane-forming composition to the porous channel walls of a second subset of channels of the masked body; curing the membrane-forming composition at a membrane-curing temperature to provide a wall-adhering fluid-permeable membrane that has second pores of a second pore size smaller than the first pore size ; after said curing of the membrane-forming composition, inserting a plugging material into the first subset of channels at a first end of the body, wherein the plugging material is different than the membrane-forming composition; inserting a plugging material into the second subset of channels comprising the wall-adhering fluid-permeable membrane at a second end of the body; and curing the plugging material at the first and second ends of the body by heating the plugging material to a plug-curing temperature that is less than the membrane-curing temperature.