Pyridine Hydrodenitrogenation over Molybdenum Carbide Catalysts

Choi, Jihun; Brenner, James R.; Thompson, Levi T.

doi:10.1006/jcat.1995.1143

Cited by 100 publications

(48 citation statements)

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“…In contrast, Mo 2 C (fcc) showed preferential formation of alkanes particularly at higher temperatures. The different behaviors of Mo 2 N and Mo 2 C in activity and selectivity were also observed by Choi et al [9] for HDN of pyridine.…”

Section: Discussionsupporting

confidence: 68%

“…Markel and Van Zee [7] revealed a strong resistance property of Mo 2 N against being sul®ded in thiophene HDS. Choi et al [9] investigated pyridine HDN on molybdenum carbides with different speci®c surface areas. Most of the above results have shown that molybdenum nitrides and carbides are superior to or comparable to commercial hydrotreating catalysts.…”

Section: Introductionmentioning

confidence: 99%

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Catalytic hydrodenitrogenation of indole over molybdenum nitride and carbides with different structures

Lee

Hyeon

et al. 1999

Applied Catalysis A: General

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The hydrodenitrogenation (HDN) of indole has been studied over Mo 2 N and Mo 2 C with different structures. The difference in activity was modest and the structure of the catalysts exerted a more signi®cant effect than the chemical composition. More evident difference was observed in selectivity, and here the composition was the most important factor. Sonochemically prepared Mo 2 C was an active catalyst for HDN reaction. It formed plate-like aggregates of loosely packed Mo 2 C (fcc) particles. The crystallinity of sonochemically prepared Mo 2 C was improved during the reaction, and its behavior in HDN became similar to Mo 2 C (fcc) prepared by the TPR method. #

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Section: Discussionsupporting

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Catalytic hydrodenitrogenation of indole over molybdenum nitride and carbides with different structures

Lee

Hyeon

et al. 1999

Applied Catalysis A: General

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“…The only crystalline phase observed in this carbide group was Mo 2 C. This observation was anticipated since according to the Mo-C phase diagram only hexagonal Mo 2 C is thermodynamically stable under the conditions employed in Rudy et al 27 These results are consistent with the XRD analysis conducted by Choi et al, 4 and Oyama et al (100) direction. Line broadening of the sonicated Mo 2 C reveals that the average crystallite size extends in the (101) direction to slightly more than 11 nm and less than 15 nm in the (100) direction.…”

Section: Resultssupporting

confidence: 83%

Synthesis and characterization of nanostructured molybdenum & tungsten carbide materials, and study of diffusion model

Covington

Munirathinam

Islam

et al. 2012

Polish Journal of Chemical Technology

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Powders of two molybdenum carbides (Mo 2 C and MoC 1-x ) and tungsten carbide (WC) were prepared by means of temperature programmed reaction (TPR) method. Mo 2 C and MoC 1-x were synthesized by reacting MoO 3 with a preselected molar ratio of methane/hydrogen and carbon monoxide/hydrogen gas mixtures respectively. WC was prepared using tungsten oxide (WO 3 ) and a methane/hydrogen gas mixture. These carbides were ultrasonically dispersed in de-ionized water. Samples were characterized using room temperature x-ray diffraction and scanning microscopy. A kinetic diffusion model is also studied to determine diffusivities in solids where the diffusing species desorbs or reacts at the external surfaces, and where the diffusivity does not vary appreciably with concentrations. The method involves measuring the fl ux of the diffusive species into the solid under the infl uence of a temperature program.

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“…In particular, for transition metal carbides and nitrides, the structure and stoichiometry of these materials near the surface are known to have influenced the catalytic properties. For example, it have been reported that the catalytic properties of Mo and W carbides changed with the amount of carbon present in the interstitial sites of the host metal lattice [9,10]. Choi et al [10] have obtained that there is a linear relationship between the pyridine HDN activities over the molybdeum carbides and particle size.…”

Section: Introductionmentioning

confidence: 99%

“…For example, it have been reported that the catalytic properties of Mo and W carbides changed with the amount of carbon present in the interstitial sites of the host metal lattice [9,10]. Choi et al [10] have obtained that there is a linear relationship between the pyridine HDN activities over the molybdeum carbides and particle size. These results suggested a structure sensitive reaction for pyridine HDN reaction over Mo carbides.…”

Section: Introductionmentioning

confidence: 99%

Ammonia decomposition over titanium carbides

Choi¹

2012

Journal of the Korean Crystal Growth and Crystal Technology

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Ammonia decomposition over titanium carbides were investigated using eight different samples which have been synthesized by TPR (temperature-programmed reduction) method of titanium oxide (TiO 2 ) with pure CH 4 . The resulting materials which were synthesized using wo different heating rates and space velocity exhibited the different surface areas. These results indicated that the structural properties of these materials have been related to heating rates and space velocity employed. The titanium carbides prepared in this study proved to be active for ammonia decomposition, and the activity changed with the particle size/surface area. These showed the relationship between ammonia decomposition activity and the different active species. Compared to molybdenum carbide, the titanium carbides were one order of magnitude less active, suggesting the correlation between the activity difference and the degree of electron transfer between metals and carbon in metal carbides.

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Pyridine Hydrodenitrogenation over Molybdenum Carbide Catalysts

Cited by 100 publications

References 0 publications

Catalytic hydrodenitrogenation of indole over molybdenum nitride and carbides with different structures

Catalytic hydrodenitrogenation of indole over molybdenum nitride and carbides with different structures

Synthesis and characterization of nanostructured molybdenum & tungsten carbide materials, and study of diffusion model

Ammonia decomposition over titanium carbides

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