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Plyusnin PE, Shubin YV, Korenev SV. SYNTHESIS, STRUCTURE, AND THERMAL PROPERTIES OF DOUBLE COMPLEX SALTS AS PRECURSORS OF NANOALLOYS OF IMMISCIBLE METALS. J STRUCT CHEM+ 2022. [DOI: 10.1134/s0022476622030040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Abstract
Ternary alloys of platinum group metals attract a growing interest due to their unique catalytic properties. The present research is aimed to synthesize a series of Rh-Pd-Pt alloys with varied ratios of metals using a single-source precursor approach. Rhodium and palladium are partly miscible metals, while each of these metals is unlimitedly miscible with platinum. Thermolysis of complex salts used as a precursor results in the formation of metastable systems. The 3D nanostructure alloys are being formed after the complete decomposition of the single-source precursor. High-resolution transmission electron microscopic studies have shown that the nanoalloys are composed of interconnected polycrystalline ligaments with a mean diameter of 50 nm. The single-phase composition is confirmed by an X-ray diffraction analysis. The ratio of metals plays an important role in determining the catalytic activity of alumina-supported alloys and their thermal stability. According to UV-vis spectroscopy data, the higher palladium portion corresponds to worse dispersion of initially prepared, fresh catalysts. Treatment of the catalysts under prompt thermal aging conditions (up to 800 °C) causes redispersion of palladium-rich alloyed nanoparticles, thus leading to improved catalytic activity and thermal stability.
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Vasilchenko D, Topchiyan P, Baidina I, Korolkov I, Filatov E, Zvereva V, Plyusnin P, Slavinskaya E, Gerasimov E. Double complex salts containing [Pt(NO3)6]2- anion and Rh(III) complex cations: Synthesis, structure and utilisation for preparing (Rh–Pt)/CeO2 catalysts. J Mol Struct 2020. [DOI: 10.1016/j.molstruc.2020.128108] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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