Quantum chemical investigation of support-metal interactions and their influence on chemisorption. 2. Strong metal-support interaction in H...Ni-MOx (M = titanium, silicon)

Haberlandt, Helmut; Ritschl, Friedrich Wilhelm

doi:10.1021/j100409a020

Cited by 17 publications

(6 citation statements)

References 2 publications

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“…Bonneviot et al also showed by ESR and DRS that Ni + and/or Ni 2+ ions are located at the nickel−silica interface. CNDO/2 and EHMO calculations on the interaction between Ni atoms and surface clusters of oxide supports are consistent with these results: , in the case of a completely oxidized support surface such as SiO 2 , it was found that the nickel net charge is positive, indicating an electron transfer to the support.…”

Section: Discussionsupporting

confidence: 82%

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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

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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Section: Discussionsupporting

confidence: 82%

“…The Ni(II) phase−silica interface probably consists of nickel phyllosilicate whether the DP Ni(II) phase is a nickel hydroxide or a nickel phyllosilicate. On the basis of other works, − it is suggested that after reduction, all of the Ni ions of the interface are not fully reduced and act as anchoring sites for the metal particles.…”

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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“…These ions bonded to the silica surface would probably act as anchoring sites for the metal particles, leading to their stabilization, and favoring the metal dispersion and the resistance to sintering. Several experimental , and theoretical studies also suggested that unreduced ions at the metal–support interface contribute to the strong metal–support interaction. However, nickel was fully reduced on Ni/SiO 2I as can be seen from XRD and TEM results.…”

Section: Discussionmentioning

confidence: 99%

Hydrogen Production via Steam Reforming of Ethanol on Phyllosilicate-Derived Ni/SiO₂: Enhanced Metal–Support Interaction and Catalytic Stability

Zhang

Yue

Huang

et al. 2012

ACS Sustainable Chem. Eng.

184

105

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This paper describes the design of Ni/SiO 2 catalysts obtained from a phyllosilicate precursor that possess high activity and stability for bioethanol steam reforming to sustainably produce hydrogen. Sintering of metal particles and carbon deposition are two major issues of nickel-based catalysts for reforming processes, particularly at high temperatures; strong metal−support interaction could be a possible solution. We have successfully synthesized Ni-containing phyllosilicates by an ammonia evaporation method. Temperature programmed reduction results indicate that the metal− support interaction of Ni/SiO 2 catalyst prepared by ammonia evaporation method (Ni/SiO 2P ) is stronger due to the unique layered structure compared to that prepared by conventional impregnation (Ni/SiO 2I ). With the phyllosilicate precursor nickel particles highly disperse on the surface, remaining OH groups in the unreduced phyllosilicates promote nickel dispersion and carbon elimination. We also show that high dispersion of Ni and strong metal−support interaction of Ni/SiO 2P significantly promote ethanol conversion and H 2 production in ethanol steam reforming. Ni/SiO 2P produces less carbon deposition compared to Ni/SiO 2I ; for the latter, a surface layer of Ni 3 C formed during the deactivation.

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“…It has been suggested that minor amount of unreduced nickel ions on the silica support could remain at the interface of nickel metal-silica surface as proved by some experimental and theoretical studies [45][46][47][48][49]. This condition was due to strong interaction between nickel phylosilicate and silica surface [50].…”

Section:  mentioning

confidence: 97%

Synthesis and Characterization of Mesostructured Cellular Foam (MCF) Silica Loaded with Nickel Nanoparticles as a Novel Catalyst

Hermida¹,

Abdullah²,

Mohamed³

2013

MSA

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This work investigated the possibility of incorporation of nickel into several mesostructured cellular foam (MCF) silica supports prepared at various aging times (1, 2, and 3 days) by using deposition-precipitation method followed by reducetion process and to look for the best support to obtain supported nickel catalyst with highest nickel loading and smallest size of nickel nanoparticles. Analyses using nitrogen adsorption-desorption, transmission electron microscopy (TEM), X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) showed that MCF silica prepared at aging time of 3 days was the best support as the corresponding nickel functionalized MCF catalyst had the highest nickel content (17.57 wt%) and the smallest size of nickel nanoparticles (1 - 2 nm) together with high porosity (window pore size of 90A). The result was attributed to the highest window pore size in the MCF support which allowed more nickel nanoparticles to be incorporated.

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Quantum chemical investigation of support-metal interactions and their influence on chemisorption. 2. Strong metal-support interaction in H...Ni-MOx (M = titanium, silicon)

Cited by 17 publications

References 2 publications

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

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

Hydrogen Production via Steam Reforming of Ethanol on Phyllosilicate-Derived Ni/SiO₂: Enhanced Metal–Support Interaction and Catalytic Stability

Synthesis and Characterization of Mesostructured Cellular Foam (MCF) Silica Loaded with Nickel Nanoparticles as a Novel Catalyst

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Quantum chemical investigation of support-metal interactions and their influence on chemisorption. 2. Strong metal-support interaction in H...Ni-MOx (M = titanium, silicon)

Cited by 17 publications

References 2 publications

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

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

Hydrogen Production via Steam Reforming of Ethanol on Phyllosilicate-Derived Ni/SiO2: Enhanced Metal–Support Interaction and Catalytic Stability

Synthesis and Characterization of Mesostructured Cellular Foam (MCF) Silica Loaded with Nickel Nanoparticles as a Novel Catalyst

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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

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

Hydrogen Production via Steam Reforming of Ethanol on Phyllosilicate-Derived Ni/SiO₂: Enhanced Metal–Support Interaction and Catalytic Stability