South African Journal of Chemistry
versão On-line ISSN 1996-840X
ZHONG, Hua e XIE, Hongliang. The influence of palladium on the structure and catalytic activity of lanthanum based mixed oxide. S.Afr.j.chem. (Online) [online]. 2009, vol.62, pp. 56-59. ISSN 1996-840X.
LaSrCo0.9Pd0.1O4 and LaSrCoO4 mixed oxides were prepared and characterized by XRD, FTIR, BET and XPS, then studied for the reduction of NO by CO. The results show that all samples display characteristic peaks of crystal structure A2BO4 and show the rather strong diffraction pattern for LaSrCo0.9Pd0.1O4 (reduced and oxidized) and weak signals of lanthanum oxide for LaSrCo0.9Pd0.1O4 (reduced). The noble metal Pd has a significant influence on the specific surface areas, pore volumes, binding energies and activities of the samples. For NO reduction by CO, catalytic activity shows complete conversion below 360 °C and the order of activity is LaSrCo0.9Pd0.1O4 (reduced and oxidized) > LaSrCo0.9Pd0.1O4 (reduced) > LaSrCoO4 (reduced). Kinetic analysis for NO reduction by CO indicates that the specific reaction rate is significantly affected by the synthesis procedure.
Palavras-chave : Noble metal Pd; NO reduction by CO; XPS.