Patent ID: 7138355

Claim:
A method of preparing an ink which can be used for the manufacture of a functional layer, which ink contains dispersely distributed particles forming first and second solid phases, with catalytic reactions being able to be activated in the manufactured functional layer on a gas/solid interface by a combined action of the first and second solid phases and with gaseous reactants, wherein, in a first step, the solid phases are formed as fine-grain particles; wherein the particles of the solid phases are dispersed in a first liquid in a mixed and homogeneously distributed manner; wherein heterogeneous conglomerates of the fine-grain particles are formed from the thereby created dispersion; wherein the conglomerates are mixed to form a homogeneous ink, after sintering, by addition of a second liquid and by comminution, with particles formed in the first step having such a fine grain that the heterogeneous conglomerates and their fractions each contain a plurality of particles of the first and second solid phases after comminution. wherein the first solid phase is an “active oxide” which has the following chemical composition: Ni1−xMxO, where x=0–0.05 and M=Cu, V, Mg, Pt, Co, Fe, Mo, W; and the second solid phase has the following chemical composition: YxM′yZr1−x−yO2, where x=0–0.1 and v=0–0.1 and M′=Ti, Mn, Al, Nb or Ce1−x−yM″xM″′yO2, where x=0–0.4 and y=0–0.05 and M″=Gd, Sm, Y and M″′=Co, Fe, Mn; and wherein the first and second solid phases have a ratio—in weight percent—in a range from 50:50 to 70:30.