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- W2033857824 abstract "The influence of the parameters of the deposition−precipitation method used to prepare Ni/SiO2 samples on the size of nickel metal particles was investigated by temperature-programmed reduction, transmission electron microscopy, and thermogravimetry. The results show that the average metal particle size, which varies between 27 and 79 Å, depends on the nature and the reducibility of the supported Ni(II) phase (nickel hydroxide or 1:1 nickel phyllosilicate), and on the extent of the interface between the supported Ni(II) phase and silica. These parameters themselves depend on the characteristics of the silica support (surface area and morphology) and on the preparation parameters (urea and silica concentrations). At the interface, a nickel phyllosilicate is detected whatever the nature of the supported Ni(II) phase. The metal particles are smaller and the size distribution is narrower when the supported phase is a 1:1 nickel phyllosilicate (d̄ ≤ 50 Å, 10−100 Å) than when it is a nickel hydroxide (d̄ ≈ 80 Å, 20−280 Å). The metal particles are smaller when the extent of the Ni(II) phase−silica interface increases. This arises from the comparison of Ni/SiO2 samples prepared from silicas of high and low surface area, and from nonporous and porous silica." @default.
- W2033857824 created "2016-06-24" @default.
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- W2033857824 date "1999-07-01" @default.
- W2033857824 modified "2023-10-18" @default.
- W2033857824 title "Metal Particle Size in Ni/SiO<sub>2</sub> Materials Prepared by Deposition−Precipitation: Influence of the Nature of the Ni(II) Phase and of Its Interaction with the Support" @default.
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- W2033857824 doi "https://doi.org/10.1021/jp990115t" @default.
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