The catalyst layer itself which is porous, comprises a metal, such as palladium (Pd) or platinum (Pt),...http://www.google.com/patents/US5525570?utm_source=gb-gplus-sharePatent US5525570 - Process for producing a catalyst layer on a carrier and a catalyst produced therefromAdvanced Patent SearchPublication numberUS5525570 APublication typeGrantApplication numberUS 08/310,430Publication dateJun 11,