Characterization of coprecipitated nickel catalysts

Uchiyama, S.; Obayashi, Yasuo; Hayasaka, Toshiaki; Kawata, Noboru

doi:10.1016/s0166-9834(00)83271-6

Cited by 13 publications

(6 citation statements)

References 13 publications

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“…The difference between the two peaks in both reduced and used samples is 17.5 eV which are very close to the reported values . This XPS patterns with the absence of satellite peaks indicates that the complete reduction of NiO species present on the catalyst surface to metallic Ni in the reduction process . In the XRD of reduced catalysts shows only metallic Ni phases, this indicates the complete reduction of metal oxides to active Ni metal.…”

Section: Resultsmentioning

confidence: 89%

Ni‐Al‐Ti Hydrotalcite Based Catalyst for the Selective Hydrogenation of Biomass‐Derived Levulinic Acid to γ‐Valerolactone

et al. 2019

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NiÀ Al-Ti mixed oxide derived from NiÀ Al-Ti hydrotalcite precursor is identified as an efficient catalyst for the hydrogenation of levulinic acid (LA) to γ-valerolactone (GVL). This catalyst showed high active surface Ni sites due to a higher synergy in the mixed oxide formed from the hydrotalcite precursor. These results are further supported by X-ray diffraction analysis (XRD), electron spin resonance spectroscopy (ESR) and scanning electron microscopy (SEM) results. The higher activity of NiÀ Al-Ti compared to NiÀ Al, NiÀ Ti catalysts was attributed to a high ratio of Lewis to Brønsted acid sites (LAS/BAS) observed from pyridine adsorption -DRIFTS results along with high surface Ni sites on the catalyst surface measured from CO-chemisorption studies. This contributed to the enhanced selectivity of the desired product, GVL over NiÀ Al-Ti catalyst as compared to its individual counter parts, NiÀ Ti and NiÀ Al catalysts.[a] R.

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Section: Resultsmentioning

confidence: 89%

Ni‐Al‐Ti Hydrotalcite Based Catalyst for the Selective Hydrogenation of Biomass‐Derived Levulinic Acid to γ‐Valerolactone

et al. 2019

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“…It was widely believed that the stronger the metal-support interaction, the smaller the metal particle size formed by reduction. [40][41][42] The uniform distribution should attribute to sufficient interaction between nickel aqua ammine complex ions and surface silanol groups in the aqueous phase. The highly dispersed Ni-AE sample shown by TEM images was consistent with the XRD result.…”

Section: Resultsmentioning

confidence: 99%

“…Previous work has shown that the strong metal-support interactions are conducive to formation of smaller metal particles with high dispersion. [39][40][41][42] As a result, the formation of carbon was generally suppressed by the small Ni particles.…”

Section: Analysis Of Catalyst Deactivationmentioning

confidence: 99%

A stable Ni/SBA-15 catalyst prepared by the ammonia evaporation method for dry reforming of methane

et al. 2015

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“…It is generally accepted in the literature ,,, that the stronger the nickel−support interaction, the smaller the metal particle size generated by thermal reduction. However, it is not always clear whether the nickel−support interaction refers to the Ni(II) or Ni(0) phase.…”

Section: Discussionmentioning

confidence: 99%

Metal Particle Size in Ni/SiO₂ Materials Prepared by Deposition−Precipitation: Influence of the Nature of the Ni(II) Phase and of Its Interaction with the Support

1999

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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.

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Characterization of coprecipitated nickel catalysts

Cited by 13 publications

References 13 publications

Ni‐Al‐Ti Hydrotalcite Based Catalyst for the Selective Hydrogenation of Biomass‐Derived Levulinic Acid to γ‐Valerolactone

Ni‐Al‐Ti Hydrotalcite Based Catalyst for the Selective Hydrogenation of Biomass‐Derived Levulinic Acid to γ‐Valerolactone

A stable Ni/SBA-15 catalyst prepared by the ammonia evaporation method for dry reforming of methane

Metal Particle Size in Ni/SiO₂ Materials Prepared by Deposition−Precipitation: Influence of the Nature of the Ni(II) Phase and of Its Interaction with the Support

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Characterization of coprecipitated nickel catalysts

Cited by 13 publications

References 13 publications

Ni‐Al‐Ti Hydrotalcite Based Catalyst for the Selective Hydrogenation of Biomass‐Derived Levulinic Acid to γ‐Valerolactone

Ni‐Al‐Ti Hydrotalcite Based Catalyst for the Selective Hydrogenation of Biomass‐Derived Levulinic Acid to γ‐Valerolactone

A stable Ni/SBA-15 catalyst prepared by the ammonia evaporation method for dry reforming of methane

Metal Particle Size in Ni/SiO2 Materials Prepared by Deposition−Precipitation: Influence of the Nature of the Ni(II) Phase and of Its Interaction with the Support

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Metal Particle Size in Ni/SiO₂ Materials Prepared by Deposition−Precipitation: Influence of the Nature of the Ni(II) Phase and of Its Interaction with the Support