Catalytic combustion of hydrocarbons with Mn and Cu-doped ceria-zirconia solid solutions

The catalytic activity of a series of CeO2-ZrO2 mixed oxides in the total o xidation of methane and light hydrocarbons has been investigated. The influ ence of dopants like Mn and Cu has also been studied. It is shown that both MnOx and CuO at low loading dissolve within the ceria-zirconia lattice. Th is strongly influences the redox behaviour of the catalysts by promoting lo w-temperature reduction of Ce4+. In addition, the ternary oxides show bette r stability to repeated redox cycles, which is attributed to the presence o f ZrO2. The catalytic activity of pure CeO2 is also enhanced in the presenc e of ZrO2, reaching a maximum with Ce0.92Zr0.08O2; a further promotion of a ctivity is observed with the introduction of MnOx and CuO dissolved into Ce O2-ZrO2 lattice. (C) 1999 Elsevier Science B.V. All rights reserved.