A hot gas filtration apparatus includes a vessel, a plurality of filter
elements mounted within the vessel and positioned such that hot gas flows
through said filter elements, with each of said filter elements having a
porous body, and a catalytic layer on surfaces of the porous body. The
porous body of the filter element may include one of: a porous ceramic
monolithic matrix, a continuous fiber reinforced ceramic composite (CFCC)
matrix, a metallic matrix, an intermetallic matrix, a superalloy, and a
metal-ceramic composite matrix. When the porous body is a nonoxide
ceramic, a metallic matrix, an intermetallic matrix, a superalloy, or a
metal-ceramic composite matrix, the invention further includes an
oxidative resistant layer coating surfaces within the porous body, and the
catalytic layer is on the oxidative resistant layer. A porous particulate
removal membrane can be positioned on one or more surfaces of the filter
element. The porous membrane can also provide a surface for one or more
catalysts. The catalysts on the porous surface of the membrane(s) can be
the same as or different from the catalysts on surfaces within the porous
body.
