Tantalum Carbide or Niobium Carbide Catalyzed Oxidation of Sulfides with Hydrogen Peroxide: Highly Efficient and Chemoselective Syntheses of Sulfoxides and Sulfones

Kirihara, Masayuki; Itou, Atsushi; Noguchi, Takuya; Yamamoto, Junya

doi:10.1055/s-0029-1219947

Cited by 58 publications

(26 citation statements)

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“…These combined advantages make the Nb-in-C complex particularly suitable for practical electrochemical ORR catalysis. Obviously, such niobium-carbon structures also have the potential to be used in other catalysis reactions such as the decomposition of ammonia 35 , the catalytic CO oxidation reactions 36 and the catalytic oxidation of sulphides 37 . Our modified arc-discharge equipment can be continuously operated by circulating the methane gas to reach a productivity of 50-100 g per hour, which is attractive for practical industrial applications.…”

Section: Discussionmentioning

confidence: 99%

Catalytically active single-atom niobium in graphitic layers

et al. 2013

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Carbides of groups IV through VI (Ti, V and Cr groups) have long been proposed as substitutes for noble metal-based electrocatalysts in polymer electrolyte fuel cells. However, their catalytic activity has been extremely limited because of the low density and stability of catalytically active sites. Here we report the excellent performance of a niobium-carbon structure for catalysing the cathodic oxygen reduction reaction. A large number of single niobium atoms and ultra small clusters trapped in graphitic layers are directly identified using state-of-the-art aberration-corrected scanning transmission electron microscopy. This structure not only enhances the overall conductivity for accelerating the exchange of ions and electrons, but it suppresses the chemical/thermal coarsening of the active particles. Experimental results coupled with theory calculations reveal that the single niobium atoms incorporated within the graphitic layers produce a redistribution of d-band electrons and become surprisingly active for O 2 adsorption and dissociation, and also exhibit high stability.

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Section: Discussionmentioning

confidence: 99%

Catalytically active single-atom niobium in graphitic layers

et al. 2013

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“…Both catalysts can easily be recovered and reused without losing their activity (M. Kirihara, et al, 2010) as shown in Figure (26). Fig.…”

Section: Oxidation Of Sulfides With H 2 Omentioning

confidence: 99%

Sonochemistry (Applications of Ultrasound in Chemical Synthesis and Reactions): A Review Part I

Mohamed

2016

Al-Azhar Journal of Pharmaceutical Sciences

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Sonochemistry is a powerful and green approach which is being used to accelerate synthesis of organic compounds, and involves the use of ultrasound technique to promote chemical reactions. Ultrasound is the part of the sonic spectrum, which ranges from about 20 KHz to 10 MHz. A large number of organic reactions can be carried out under ultrasonic irradiation in high yields, short reaction times, and mild conditions. Ultrasonic irradiation of liquids causes high energy chemical reactions to occur, often with the emission of light. The origin of sonochemistry and sonoluminescence is acoustic cavitation which is the formation, growth, and implosive collapse of bubbles. The collapse of bubbles caused by cavitation produces intense local heating and high pressures, with very short lifetimes (Hot spots). These hot-spots have an equivalent temperatures of roughly 5,000 K, pressures of about 1,000 atm, and increase reactivity by nearly million-fold using the radical mechanism. A variety of devices have been used for ultrasonic irradiation of solutions.

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“…The high concentration of structural vacancies in TiN 0.3 favors its diffusion and consequently increases its catalytic activity. The catalytic activity of TiN 0.3 also increases with the growth of the interface area [12][13][14]. Furthermore, the attraction of C atoms from TaC to N vacancy (V N ) sites in TiN 0.3 may influence the diffusion behavior of all atoms in the TaCTiN 0.3 system in comparison with the TaC-TiN system.…”

Section: Introductionmentioning

confidence: 99%