Catalytic Activity of Bulk Tungsten Carbides for Alkane Reforming

Keller, Valérie; Wehrer, P.; Garin, F.; Ducros, R.; Maire, G.

doi:10.1006/jcat.1995.1102

Cited by 67 publications

(26 citation statements)

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“…However, on tungsten, after an induction period, gem-dimethylcyclopentane, benzene, toluene and xylenes were formed. If originally, on "fresh" tungsten and tungsten carbides, with hydrocarbons, a very fast extensive hydrogenolysis to methane mostly occurs [46,47], on such compounds, in the presence of oxygen, this extensive hydrogenolysis is inhibited in favour of skeletal rearrangement reactions which seem to take place following a bifunctional mechanism. It was suggested that the presence of carbon in tungsten carbides modifies the electronic surface properties of tungsten in such a way that they resemble those of platinum.…”

Section: Support Influencementioning

confidence: 97%

Environmental catalysis

Garin

2004

Catalysis Today

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This review article was constructed around the first Algerian-French congress aimed on emerging materials which was held at Tamanrasset by the end of February 2003. The aim of this review is to point out that a lot of work has been done in heterogeneous catalysis to better understand the active sites responsible for the catalytic reactivity. Most of these researches were performed under reducible atmosphere, on metallic catalysts, to improve our knowledge about hydrocarbon reforming catalysts. Starting from this base which was recalled through various classes of important studies such as: (i) the dilution of the active sites, (ii) the use of bimetallics, (iii) the use of well-crystallised surfaces and (iv) the influence of the metal-support interactions; a development and an opening is made on the three-way catalysis and the DeNO x reactions. The objectives being to point out the very important influence of the experimental conditions and of the gas phase compositions which may induce very strong surface modifications of the initial metallic aggregates. Moreover, it will depend on the reactions, i.e. isomerisation, oxidation, reduction where the active site may also be composed of, in addition to the metallic crystallites, the participation of the oxygen of the support.A tentative for a general interpretation of the observed results is given by the use of the variations of the local density of states and of the "d" band centre energy.

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Section: Support Influencementioning

confidence: 97%

Environmental catalysis

Garin

2004

Catalysis Today

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“…However, early studies revealed that despite their similarity in electronic structure, the catalytic behavior of WC and Pt in heterogeneous catalysis is different. Compared to the more versatile Pt, WC was shown to perform as an active catalyst for hydrogenation and hydrogenolysis, dehydrogenation, reforming, and even Fischer–Tropsch‐like processes, but activity was only observed at high reaction temperatures (150–400 °C). Indeed, at low temperatures (40–90 °C), WC showed only a limited activity, with the important exception of the reduction of nitro compounds and quinones .…”

Section: Introductionmentioning

confidence: 99%

Hydrogenation Properties of Nanostructured Tungsten Carbide Catalysts in a Continuous‐Flow Reactor

Braun

Esposito

2016

ChemCatChem

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Tungsten monocarbide (WC) obtained via urea glass route showed a high activity as well as chemoselectivity for the continuous flow reduction of a variety of nitro groups under milder conditions, compared to previous reports. The favorable effect of the nanostructure was shown by comparison to other commercial WC species. Moreover, WC functioned as an efficient support for nickel nanoparticles, expanding its range of applicability and leading to a bimetallic Ni@WC composite characterized by high activity for the hydrogenation of cardanol, a phenolic lipid obtained from cashew nutshells

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“…There are two peaks centered at 282.8 and 284.6 eV in the C1s XPS spectrum fitted using Gaussian method. The peak at 282.8 eV corresponds to the binding energy of C1s in Co 2 C/Co 3 C species, the peak at 284.6 eV attributes to that of carbon-carbon bonds [14][15][16][17][18][19][20][21][22][23]. Fig.…”

Section: Resultsmentioning

confidence: 96%

“…Recent research has indicated that these carbides have comparable performance to noble metals in many reactions, preferably those involving hydrogen, such as hydrogenation, ammonia synthesis and decomposition, hydrodesulfurization, hydrodenitrogenation, water-gas shift reaction and hydrocarbon isomerization [15][16][17][18][19][20][21][22]. However, from the perspective of application, transition metal carbides are not only synthesized in large quantities with desired composition and structure, but are also formed hierarchical architectures with high surface areas.…”

Section: Introductionmentioning

confidence: 98%