Mechanochemical activation of industrial catalysts: 2. Adsorption properties of activated catalysts

The results of a NO, CO, and O-2 temperature-programmed desorption study of mechanochemically activated industrial NTK-10-1 and nickel-chromia catalys ts and their binary composition MK1a(1) are reported. The effect of reducti on/reoxidation processes on the surface of oxide catalytic systems on the a bsorption capability was investigated. A correlation between the surface pr operties of the catalysts and their catalytic activity in the reaction of s elective NO reduction with propane was established. Two forms of adsorbed C O, the weakly and the strongly bound carbon monoxide desorbed from the surf ace as initial adsorbate molecules and CO2, respectively, were shown to be present at the NTK-10-1 surface. It was found that copper on the surface of the catalyst NTK-10-1 primarily occurs in the form of Cu(II) cations at wh ich NO adsorption and reaction with propane takes place. The surface of the catalytic composition MK1a(1) adsorbs three times the amount of NO that mi ght be contributed by its individual components, the NTK-10-1 and Ni-Cr oxi de catalysts, thus showing the synergism or nonadditive enhancement of the adsorption capability of the binary composition.