Role of oxide surface in coordination chemistry of transition metal ions in catalytic systems

Che, M.; Bonneviot, Laurent

doi:10.1351/pac198860081369

Cited by 48 publications

(16 citation statements)

References 1 publication

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“…[13] The measured X-ray photoelectron spectroscopy (XPS) spectra (Fig. 6D) shows that the Au particles only exists in their metallic state, [29,30] and similar results were observed for the catalysts before the activation and after the reaction, indicating that metallic Au, not its oxidized state, is the active component for this reaction.…”

Section: Full Papersupporting

confidence: 69%

A Rapid and Efficient Method to Deposit Gold Particles onto Catalyst Supports and Its Application for CO Oxidation at Low Temperatures

Zhong¹,

Lin²,

Teh³

et al. 2007

Adv Funct Materials

104

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A rapid, simple, and efficient method for the preparation of highly dispersed supported Au catalysts has been developed. In the preparation, NaBH4 is used to reduce the Au precursor, lysine is employed to cap the formed Au colloids, and a short sonication time is applied to facilitate dispersion and deposition of the Au colloids onto the catalyst support, which has been mixed with the precursor beforehand. The end‐point pH value of the solution and the isoelectric points (IEPs) of the catalyst supports have an influence on the size of the Au particles and their deposition. The optimum value for the end‐point pH is 7.5–10.0, and the IEP should be 5–10. The amino acid capping agent is easily removed at the catalyst activation stage at 200 °C, and the Au particles are thermally stable against sintering, even at 500 °C for 3 h. It is also proven that the method is applicable to the preparation of supported Pt catalysts. The catalytic activity of the prepared Au catalysts for CO oxidation in the absence/presence of H2 is comparable to that of a Au catalyst prepared by the co‐precipitation (CP) method, and to that of the standard catalyst from the World Gold Council (WGC). X‐ray photoelectron spectroscopy (XPS) results show that only metallic Au exists in the catalysts before and after activation, and also after the catalysis reaction.

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Section: Full Papersupporting

confidence: 69%

A Rapid and Efficient Method to Deposit Gold Particles onto Catalyst Supports and Its Application for CO Oxidation at Low Temperatures

Zhong¹,

Lin²,

Teh³

et al. 2007

Adv Funct Materials

104

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“…For simplicity we use the term "surface hydroxyls" to describe unprotonated or singly or doubly protonated surface oxygen, and we consider only singly coordinated surface oxygen. [37][38][39][40][41][42][43]. The structure of the interfacial surface between the metal oxide and the plating solution is illustrated (Fig.…”

Section: The Processes Of New Nucleus Generation and Nickel Depositionmentioning

confidence: 99%

“…TMCs with different numbers of chelating ligands thus exhibit different reactivities toward the surface of metal oxides. [37][38][39][40][41][42][43][44]. UV-vis spectroscopy is used to confirm the structure of nickel complexes in the aqueous solution of nickel ions and en (Fig.…”

Section: The Processes Of New Nucleus Generation and Nickel Depositionmentioning

confidence: 99%

Synthesis of nickel nanoparticles supported on metal oxides using electroless plating: Controlling the dispersion and size of nickel nanoparticles

Zhang

et al. 2009

Journal of Colloid and Interface Science

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“…Active phase-support interactions affect the dispersion of transition metals and the catalytic activity of the catalysts prepared from them [5,6]. Che and Bonneviot [7] have developed a two-step preparation method capable of controlling the particle size of an Ni/SiO 2 catalyst. The nucleation step gave nickel oxide nuclei in strong interaction with the support; thereby the impregnation step effectively yielded a nickel reservoir [8].…”

Section: Introductionmentioning

confidence: 99%

Grafted NiO on natural olivine for dry reforming of methane

Courson¹,

Udron²,

Petit

et al. 2002

Science and Technology of Advanced Materials

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Natural olivine is used for gasification of biomass in a fluidised bed. Characterisations by X-ray diffraction and electron microscopies (SEM and TEM) have proved the presence of a (Mg,Fe) 2 SiO 4 structure (Mg/Fe ratio: 9/1) with a rather broad distribution in elemental composition. Temperature programmed reduction has revealed equally the presence of iron oxides outside of this structure. The nature of free iron oxides can be both modified by increasing the temperature of calcination and confirmed by measurements of magnetism. The introduction of nickel oxide upon natural olivine is obtained by impregnation with a nitrate salt. The type of interaction of nickel oxide with olivine is different depending upon the preparation method and the calcination temperature. For calcination at 1100 8C, the effects of the amount of NiO and the number of impregnation have been studied. At a high temperature of calcination (1400 8C), NiO is integrated into the olivine structure and the amount of free iron increases. Integrated NiO on olivine is non-reducible, resulting in an inactive catalyst. At lower calcination temperatures grafted NiO is formed, a species which is reduced under catalytic test conditions without aggregation of particles. A single impregnation of nickel (5.5 wt% of NiO) gives a stable catalyst activated directly under reaction conditions (CH 4 þ CO 2) yielding 96% CO and 76% H 2. Catalysts with lower amounts of NiO or a double impregnation of nickel salt lead to a less stable system. Analysis reveals that no change in olivine structure nor size of nickel deposit occurs under test conditions. Equally there are no carbon deposits formed on these catalysts. A model of the evolution of each catalytic system arising from the different preparation methods is proposed. The observed deactivation of such catalysts is attributed to the increase in the amount of free iron, which favours the oxidative properties of the catalytic system.

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Role of oxide surface in coordination chemistry of transition metal ions in catalytic systems

Abstract: Abstract

Cited by 48 publications

References 1 publication

A Rapid and Efficient Method to Deposit Gold Particles onto Catalyst Supports and Its Application for CO Oxidation at Low Temperatures

A Rapid and Efficient Method to Deposit Gold Particles onto Catalyst Supports and Its Application for CO Oxidation at Low Temperatures

Synthesis of nickel nanoparticles supported on metal oxides using electroless plating: Controlling the dispersion and size of nickel nanoparticles

Grafted NiO on natural olivine for dry reforming of methane

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