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| Home > Publications database > A-site deficient lanthanum-calcium chromite-titanates doped with 3d transition metals: synthesis, oxygen nonstoichiometry, electrical conductivity, and catalytic activity |
| Home > Publications database > A-site deficient lanthanum-calcium chromite-titanates doped with 3d transition metals: synthesis, oxygen nonstoichiometry, electrical conductivity, and catalytic activity |
| Journal Article | PreJuSER-59891 |
; ; ; ; ; ; ;
2007
Springer
Berlin
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Please use a persistent id in citations: doi:10.1007/s11581-007-0083-1
Abstract: Six La0.4Ca0.5Ti0.5Cr0.4M0.1O3-delta (M=Cr, Mn, Fe, Co, Ni, Cu) and two La0.4Ca0.4Ti0.4Cr0.4M0.2O3-delta (M= Ni, Cu) single-phase compositions were prepared by conventional solid-state reactions. Oxygen nonstoichiometry, electrical conductivity, phase transformations under reduction-reoxidation at high temperatures and catalytic activity for hydrocarbons oxidation of these compositions were investigated in a wide temperature and oxygen partial pressure range. The Cu-, Ni-, Co-, and Fe-containing compositions are decomposed in reducing Ar/H2O/H-2 atmosphere with pH(2)O/pH(2)=0.3 at 1,000 degrees C, while the Cr- and Mn-containing ceramics remain stable at the same conditions. The metallic particles of the added 3d elements formed after decomposition were registered by X-ray diffraction method in case of Cu- and Ni-containing compositions. These formed composites can be completely reoxidized with formation of initial compositions by treatment in air at 1,000 degrees C. The electrical conductivity of the ceramics investigated in air and Ar/H2O/H-2 gas flow increases with rising M content. The highest catalytic activity for oxidation of CH4 and C3H6, which was comparable with the activity of the La0.4Ca0.5Ti0.5Cr0.5O3-delta + 5%NiO composite, shows the Cu-containing powders.
Keyword(s): J ; 3d-metal-doped chromites-titanates (auto) ; oxygen stoichiometry (auto) ; electrical conductivity (auto) ; catalytic activity (auto)
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