Redox transformations in the surface layer of complex RBa2Cu3Oy oxides (R = Nd, Ho, Y) and their catalytic properties in CO oxidation

Initial stages of redox transformations in the surface layers of complex RBa2Cu3O y oxides (R = Nd, Ho, Y) in the course of their interaction with CO and O2 are studied under non-steady-state conditions by a pulse microcatalytic method. It is shown that the interaction of RBa2Cu3O y phases (R = Y, Ho, Nd) with CO results in the removal of a weakly bound oxygen and in the formation of a surface layer of RBa2Cu3O y reduction products. It is found that RBa2Cu3O y oxides retain their ability to be oxidized after reductive treatment. Oxygen from the bulk phases of multicomponent RBa2Cu3O y oxides can take part in the catalytic oxidation of CO.