Phase composition and catalytic properties in methanol decomposition of iron–ruthenium modified activated carbon

Paneva, Daniela; Tsoncheva, Tanya; Manova, Elina; Mitov, Ivan; Ruskov, T.

doi:10.1016/j.apcata.2004.02.024

Cited by 14 publications

(1 citation statement)

References 66 publications

(78 reference statements)

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“…Besides Cu-ZnO systems and group 10 and 11 metals (among which Ni and Pd have been the most widely studied [15]), a great deal of literature exists on methanol decomposition (including anaerobic oxidation) over Co or Fe oxide-based catalysts [21][22][23][24][25]. Cobalt has also been proposed as a very promising catalyst to replace noble metals for H 2 production by steam reforming of ethanol [26,27].…”

Section: Introductionmentioning

confidence: 99%

On the Role of Morphology of CoFeO₄ Spinel in Methanol Anaerobic Oxidation

et al. 2012

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A CoFe 2 O 4 inverse spinel calcined at two different temperatures (450°C and 750°C), in order to modulate the growth of the crystallites, has been employed in methanol anaerobic oxidation. A correlation between physico-chemical properties and catalytic performances of the material has been pursued. The study of both surface and bulk properties has been carried out by means of different experimental techniques, among which X-ray diffraction (XRD), transmission electron microscopy (TEM), and in situ FTIR spectroscopy. The FTIR study of both bulk and surface spectral features reveals that the calcination step is responsible for the different type of exposed surface sites, and as a consequence, for the different catalytic behaviour. As the use of the spinel as catalyst for methanol transformation into H 2 necessarily implies a regeneration step with steam, in order to recover the oxidative capacity of the solid, both surface and bulk features of the reoxidized solids have been also studied. All results reveal that the two samples, originally morphologically quite different from one another, become very similar after just one redox cycle. Still, it has been also demonstrated that both used materials irreversibly modify their surface properties after the reduction/oxidation process.

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Section: Introductionmentioning

confidence: 99%

On the Role of Morphology of CoFeO₄ Spinel in Methanol Anaerobic Oxidation

et al. 2012

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A Rational Repeating Template Method for Synthesis of 2 D Hexagonally Ordered Mesoporous Precious Metals

Takai

Doi

Yamauchi

et al. 2010

Chemistry An Asian Journal

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A repeating template method is presented for the synthesis of mesoporous metals with 2D hexagonal mesostructures. First, a silica replica (i.e., silica nanorods arranged periodically) is prepared by using 2D hexagonally ordered mesoporous carbon as the template. After that, the obtained silica replica is used as the second template for the preparation of mesoporous ruthenium. After the ruthenium species are introduced into the silica replica, the ruthenium species are then reduced by a vapor-infiltration method by using the reducing agent dimethylamine borane. After the ruthenium deposition, the silica is chemically removed. Analysis by transmission and scanning electron microscopies, a nitrogen-adsorption-desorption isotherm, and small-angle X-ray scattering revealed that the mesoporous ruthenium had a 2D hexagonal mesostructure, although the mesostructural ordering is decreased compared to that of the original mesoporous carbon template. This method is widely applicable to other metal systems. By changing the metal species introduced into the silica replica, several mesoporous metals (palladium and platinum) can be synthesized. Ordered mesoporous ruthenium and palladium, which are not easily attainable by the soft-templating methods, can be prepared. This study has overcome the composition variation limitations of the soft-templating method.

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Graphite Electrodes Modified with Platinum‐Nickel Nano‐Particles for Methanol Oxidation

2007

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Methanol electro‐oxidation is investigated at graphite electrodes modified with various platinum and nickel nano‐particle deposits using cyclic voltammetry. The modified electrodes are prepared by the simultaneous electrodeposition of metals from their salt solutions using potentiostatic and galvanostatic techniques. They show enhanced catalytic activity towards methanol oxidation in KOH solution. The catalytic activity of platinum nano‐particles is found to be significantly affected by the presence of relatively small amounts of nickel deposits. A comparison is made between the electrocatalytic activity of Pt/C and (Pt‐Ni)/C electrodes. The results show that the methanol electro‐oxidation current increases with an increase in the nickel content. In particular, the highest catalytic activity is achieved for platinum to nickel deposits of 95%:5% (wt.‐%), in other cases the catalytic activity decreases. It is found that Ni enhances the catalytic activity of Pt by increasing the number of active sites, as well as through an electron donation process from Ni to Pt. This process takes place once the nickel hydroxide (Ni(OH)2)/nickel oxy‐hydroxide (NiOOH) transformation begins. The effect of the methanol concentration on the methanol oxidation reaction is investigated. The order of reaction, with respect to methanol, at the modified (Pt‐Ni)/C electrode is found to be 0.5.

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Phase composition and catalytic properties in methanol decomposition of iron–ruthenium modified activated carbon

Cited by 14 publications

References 66 publications

On the Role of Morphology of CoFeO₄ Spinel in Methanol Anaerobic Oxidation

On the Role of Morphology of CoFeO₄ Spinel in Methanol Anaerobic Oxidation

A Rational Repeating Template Method for Synthesis of 2 D Hexagonally Ordered Mesoporous Precious Metals

Graphite Electrodes Modified with Platinum‐Nickel Nano‐Particles for Methanol Oxidation

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Phase composition and catalytic properties in methanol decomposition of iron–ruthenium modified activated carbon

Cited by 14 publications

References 66 publications

On the Role of Morphology of CoFeO4 Spinel in Methanol Anaerobic Oxidation

On the Role of Morphology of CoFeO4 Spinel in Methanol Anaerobic Oxidation

A Rational Repeating Template Method for Synthesis of 2 D Hexagonally Ordered Mesoporous Precious Metals

Graphite Electrodes Modified with Platinum‐Nickel Nano‐Particles for Methanol Oxidation

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On the Role of Morphology of CoFeO₄ Spinel in Methanol Anaerobic Oxidation

On the Role of Morphology of CoFeO₄ Spinel in Methanol Anaerobic Oxidation