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• W2162787747 abstract "The structure of palladium catalysts (0.3 wt% Pd), supported on sol–gel alumina–lanthana mixed oxides, was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM) and X-ray photoelectron spectroscopy (XPS). The investigation of the structure of lanthana-promoted Pd catalysts, prepared by different methods, is of great importance for the improvement of palladium-only three-way catalysts. The data obtained show the presence of a crystalline phase, different from alumina, lanthana or alumina–lanthana reported compounds, in Al2O3–La2O3 and Pd/Al2O3–La2O3. Attempts to assign this crystalline phase to a known one were unsuccessful. According to XPS data, in lanthanum-containing samples, the state of lanthanum is different from that in La2O3. After calcination in air at 1273 K for 3 h this phase vanishes and large crystals of LaAlO3, metastable for studied composition, appear. The sol–gel preparation method, in comparison with traditional preparation methods, leads to stabilization of LaAlO3 phase under the considered conditions and the increase of the stability of γ-Al2O3 phase at high temperature. The improvement of the catalytic activity at medium temperature and the increase of the selectivity to NH3 at high temperatures for lanthanum-promoted Pd catalyst are ascribed to a lanthanum-containing phase. The increase in NH3 production decreases its practical value for an NO reduction catalyst." @default.
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• W2162787747 date "1998-07-01" @default.
• W2162787747 modified "2023-09-23" @default.
• W2162787747 title "Structural properties of Pd catalysts supported on Al2O3–La2O3 prepared by sol–gel method" @default.
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• W2162787747 doi "https://doi.org/10.1016/s0926-3373(98)00010-1" @default.
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