Lanthanum cobaltate

The relatively high cost and lack of domestic supply of noble metals has spurred considerable efforts toward the development of nonnoble metal catalysts for automobile exhaust control. A very large number of base metal oxides and mixtures of oxides have been considered, especially the transition metals, such as copper, chromium, nickel, manganese, cobalt vanadium, and iron. Particularly prominent are the copper chromites, which are mixtures of the oxides of copper and chromium, with various promoters added. These materials are active in the oxidation of CO and hydrocarbons, as well as in the reduction of NO in the presence of CO (55-59). Rare earth oxides, such as lanthanum cobaltate and lanthanum lead manganite with Perovskite structure, have been investigated for CO oxidation, but have not been tested and shown to be sufficiently active under realistic and demanding conditions (60-63). Hopcalities are out-... 

Table 11.3 Lanthanum-Cobalt composite (1 - US 2 - Ti02 3 - US + Ti02 4 - US + La-Co-Ti02 (normal solid composite) 5 - US + La-Co-Ti02 (sonicated solid composite))...

Oxygen Tracer Diffusion Coefficient (D ), Oxygen Surface Exchange Coefficient (Ar) and Oxygen Ionic Conductivity (a, in air) of Doped Lanthanum Cobalt Ferrite-Based Perovskites... 

Single-phase perovskite MIECs such as Sr-doped lanthanum cobaltite (LSC), lanthanum ferrite (LSF), lanthanum cobalt ferrite (LSCF) and samarium cobaltite (SSC), and Ca-doped lanthanum ferrite (LCF) [13] are sometimes used alone in SOFC cathodes, as depicted in the lower right-hand comer of Figure 6.1, but combining an... 

Lanthanum cobaltate catalysts carbon monoxide oxidation, kinetics, 36 281-283... 

Data collected from undoped lanthanum-cobalt perovskites are discussed elsewhere [15]. Here data was collected from the cerium doped lanthanum-cobalt perovskites. The 01s spectra depicted in Figure 4 shows two main photo lines at 529.1 eV and 531.2-531.7 eV. 

Nickel Cerium Lanthanum Cobalt Manganese Gallium Praseodymium Indium El Not Critical... 

Ito, T., Zhting, Q., Stuto, F. Synthesis of perovskite-type lanthanum cobalt oxide nanoparticles by metins of mechanochemical treatment. Powder Technol. 143-144, 170-173 (2004)... 

As starting compounds, oxides and carbonates of lanthanum, cobalt, manganese and strontium of [Pg.638]

Strontium ferrate (SrFe03) has the classic perovskite structure just like lanthanum cobaltate (LaCo03). In SrFe03, iron is tetravalent and strontium is bivalent. In LaCo03, both lanthanum and cobalt are trivalent. Although these pristine compounds themselves are very interesting, some combinations of the two acquire even more exciting properties. 

PURSUING COLOSSAL MAGNETORESISTANCE IN DOPED LANTHANUM COBALTATES... 

Rosa et al. [251] investigated catalysts for autothermal reforming of diesel. Numerous systems were tested. Firstly, platinum, ruthenium, cobalt and nickel catalysts on an alumina carrier promoted with magnesium and lanthanides to improve thermal stability were investigated. The second set of samples was composed of cobalt perovsldte catalysts. In addition, Rosa et al. investigated ruthenium and platinum catalysts on lanthanum/cobalt perovsldtes. The samples were tested at gas hourly space velocities of between 20 000 and 80 000 h and S/C ratios from 3 to 5. The O/C ratio was set to between 0.4 and 1.4 and the temperature to 650-900 °C. Amongst the first set of samples, platinum stabilised by a dual set of lanthanum stabilisers, that were not disclosed, showed improved performance over nickel and ruthenium. The optimum conditions were 750 °C reaction temperature,... 

The equilibrium phase diagram for the La-Co-Ge system has not been reported. Lanthanum-cobalt-germanium combinations have been investigated only with respect to... 

Lanthanum Cobalt oxide LaCo03 La rare earth metal Co Cobalt ore... 

Anode - Reaction site for oxidation of water (creation of O2) - Porous layer (to facilitate the evacuation of the gas produced) - Perovskite-type oxide - The materials typically used are LSM (LaSrxMni.x03) or LSCF - Many other alternatives are possible - LSM = Lanthanum strontium manganite -LSCF = Lanthanum cobalt strontium ferrite... 

Barnard, K.R., Foger, K., Turney, T.W., and Williams, R.D. (1990) Lanthanum cobalt oxide oxidation catalysts derived from mixed hydroxide precursor. /. Catal, 125 (2), 265-275. 

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