V. A. Sadykov, Boreskov Institute of Catalysis, Novosibirsk, Russia; N. Orlovskaya, Drexel University, Philadelphia, PA; S. Neophytides, Institute of Chemical Engineering &High Temperature Processes, Patras, Greece; V. V. Zyryanov, Institute of Solid State Chemistry and Mechanochemistry, Novosibirsk, Russia
Results of research aimed at elucidation of factors determining the oxygen mobility in cation and anion substituted LaMnO3 samples as well as in their nanocomposites with doped ceria systems synthesized by Pechini and/or MA routes and sintered up to 1300 oC will be presented. The mobility and reactivity of the surface and lattice oxygen of samples was characterized by the isotope exchange, thermal desorption and temperature-programmed reduction by H2, CO, and CH4. By comparing with results of samples bulk and surface characterization by combination of diffraction and spectroscopic methods, the effect of cation and anion stoichiometry, vacancies, Mn and dopant cations charge/size, distortion of coordination polyhedra and percolation in nanocomposites on the oxygen mobility and reactivity was assessed. Promising systems for the practical application were suggested. Support by INTAS 01-2162 and NATO Collaborative Linkage Grant PST.CLG.979411 is acknowledged.
Summary: Factors determining the oxygen mobility in cation and anion substituted lanthanum manganite samples as well as in their nanocomposites with doped ceria systems synthesized by Pechini and/or mechanical activation route and sintered at temperatures up to 1300 C are considered. Support of INTAS o1-2162 and NATO PST.CLG.979411 Grants is acknowledged.
