LaCaCoO perovskite-type oxides: preparation, characterisation, stability, and catalytic potentiality for the total oxidation of propane

NO oxidation over Ni–Co perovskite catalysts

“…Three types of O 2 species were observed over the catalysts employed. The first peak between 50°C and 150°C was ascribed to physisorbed oxygen species [23] mainly originate from the bulk [13]. However, the b-O 2 peak became more obvious due to the Co-doping.…”

Sol–gel synthesis, X-ray photoelectron spectroscopy and electrical conductivity of Co-doped (La, Sr)(Ga, Mg)O3− perovskites

“…20,29 Therefore, different oxidation states of Co ions could not be discriminated since binding energies are similar. 26 The presence of Co 2+ should be assessed by satellite peaks in the 785-788 eV range. 26,30 However, due to the low Co concentration (∼2 wt.%) in LSGMC 0.085 and the consequent low intensity of the Co 2p signal, the lack of satellite peaks in our spectra did not allow to exclude the presence of divalent cobalt in our sintered materials.…”

EFFECT OF COOPER ON THE CATALYTIC ACTIVITY FOR ACETYLACETATE COMBUSTION OF Ca1-x Cu xZrO3 AND Sr1-xCu xZrO3 PEROVSKITE-TYPE OXIDES

“…Figures 4.a) and 4.b) presents the experimental oxygen TPD profiles. For Ca series, the profiles are the expected for perovskites type oxides [14,22]. Basically the first desorption peak at temperatures lower that 100°C corresponds to the physisorbed oxygen species and the second peak, which clearly appears for the non stoichiometric cooper free Ca 0.15 Zr 0.8 O 1.85 perovskite at 250°C, is attributed to the so-called a-oxygen, ascribed to oxygen vacancies that desorbs below 500°C.…”