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• W2091926677 endingPage "10452" @default.
• W2091926677 startingPage "10446" @default.
• W2091926677 abstract "Palladium (II) hexafluoroacetylacetonate (Pd(hfac)2) dissolved in liquid carbon dioxide (L-CO2) was used to deposit Pd nanoparticles onto low-surface-area α-alumina (13 m2/g) and high-surface-area γ-alumina (207 m2/g). These nanoparticles were prepared by contacting Pd(hfac)2 dissolved in L-CO2 with the alumina at 6.9 MPa and 28.5 °C and then slowly venting gaseous CO2 until L-CO2 was completely evaporated. After depressurization to remove the CO2 and unabsorbed Pd(hfac)2, the impregnated Pd(hfac)2 was reduced in hydrogen at a relatively low temperature of 75 °C. The adsorption isotherm of Pd(hfac)2 on γ-alumina suggests a weak interaction between the organometallic compound and the support. The average Pd particle size on the low-surface-area α-alumina, measured by scanning electron microscopy, increased from 13.1 ± 3.5 to 59.9 ± 11.3 nm, and the metal dispersion, measured by pulsed CO chemisorption, decreased from 11 to 3%, as the Pd loading on the alumina was increased from 0.15 to 1.54 wt %. With the high-surface-area γ-alumina, Pd particle size, measured by scanning transmission electron microscopy, increased from 3.1 ± 1.9 to 7.0 ± 5.9 nm, and the metal dispersion decreased from 56 to 5%, as Pd loading was increased from 0.58 to 3.94 wt %." @default.
• W2091926677 created "2016-06-24" @default.
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• W2091926677 date "2008-06-21" @default.
• W2091926677 modified "2023-09-24" @default.
• W2091926677 title "Characterization of Palladium (Pd) on Alumina Catalysts Prepared Using Liquid Carbon Dioxide" @default.
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• W2091926677 doi "https://doi.org/10.1021/jp711495n" @default.
• W2091926677 hasPublicationYear "2008" @default.
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