Catalytic alkane dehydrogenations

Zhang, Yuxuan; Yao, Wubing; Fang, Huaquan; Hu, Aiguo; Huang, Zheng

doi:10.1007/s11434-015-0818-8

Cited by 60 publications

(30 citation statements)

References 96 publications

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“…In the majority of these systems Ir pincer complexes have been extensively studied, although the development of other metal systems has also received research interest. 60 Most of these processes proceed via C–H oxidative addition and the formation of metal–carbon bonds tend to occur at 1° C–H bonds rather than 2° and 3° C–H bonds. Thus, organometallic AD is fundamentally promising for the production of α-olefins.…”

Section: Alkane Functionalisation Via C–h Bond Actmentioning

confidence: 99%

Challenges and opportunities for alkane functionalisation using molecular catalysts

2018

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Section: Alkane Functionalisation Via C–h Bond Actmentioning

confidence: 99%

Challenges and opportunities for alkane functionalisation using molecular catalysts

2018

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“…The first observed cyclometallation was reported by Chatt from a Ru(0) intermediate in 1965 [ 29 , 33 ]. In the past few years, the dehydrogenation of alkanes by a Ru(0) catalyst was reported by Goldman [ 34 ] as well as its acceptorless variant with Ru(II) pincer catalysts by Roddick and Huang [ 35 , 36 ].…”

Section: Resultsmentioning

confidence: 99%

The Fascinating Flexibility and Coordination Modes of a Pentamethylene Connected Macrocyclic CNC Pincer Ligand

Jordan

Kunz

2021

Molecules

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The coordination chemistry of an electron-rich macrocyclic CNC pincer-ligand consisting of two pentamethylene tethered N-heterocyclic carbene moieties on a carbazole backbone (bimcaC5) is investigated by mainly NMR spectroscopy and X-ray crystal structure analysis. A bridging coordination mode is found for the lithium complex. With the larger and softer potassium ion, the ligand adopts a facial coordination mode and a polymeric structure by intermolecular potassium nitrogen interactions. The facial coordination is also confirmed at a Cp*Ru fragment, while C-H activation under dehydrogenation at the alkyl chain is observed upon reaction with [Ru(PPh3)3Cl2]. In contrast, Pd(OAc)2 reacts under C-H activation at the central carbon atom of the pentamethylene tether to an alkyl-pincer macrocycle.

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“…Similarly to previous studies [17], this tribocatalytic performance is expected to originate from the copper presence in the coating with the possible contribution of Mo [23] released during sliding. The contact pressure and temperature supported by local asperity heating events [24] are assisting in the tribocatalytic process by providing enough energy for alkane chain dehydrogenation and dissociation [25] in presence of the catalyst leading to the release of carbon and formation of the DLC lm.…”

Section: Resultsmentioning

confidence: 99%

Tribocatalytically-activated carbon-based tribofilm formation for wear reduction in alkane environment

Shirani

Eryilmaz

et al. 2021

Preprint

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Minimizing the wear of the surfaces exposed to mechanical shear stresses is an ideal solution to maximizing the lifespan of rotary mechanical parts. In this study, we have discovered the anti-wear capability of a series of metal nitride-copper nanocomposite coatings tested in a liquid hydrocarbon environment. The results indicate substantial reduction of the wear in comparison to the uncoated steel substrate. Analysis of the wear tracks indicates the formation of carbon-based protective films directly at the sliding interface during the tribological tests. Raman spectroscopy mapping of the wear track suggests the amorphous carbon (a-C) nature of the formed film. Further analysis of the tribocatalytic activity activation as a function of load (0.25-1 N) and temperature (25°C, and 50°C) was performed in three alkane solutions, decane, dodecane, and hexadecane. Results indicated that elevated temperature and high contact pressure result in more stable friction behavior of the coating. The elemental energy dispersive x-ray spectroscopy analysis and Raman analyses reveal how a-C film facilities easy shearing at the contact interface thus enabling more stable friction and lower wear at higher loads and elevated temperature. These results provide new insights into the tribocatalysis mechanism that enables the formation of zero-wear coatings.

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Catalytic alkane dehydrogenations

Cited by 60 publications

References 96 publications

Challenges and opportunities for alkane functionalisation using molecular catalysts

Challenges and opportunities for alkane functionalisation using molecular catalysts

The Fascinating Flexibility and Coordination Modes of a Pentamethylene Connected Macrocyclic CNC Pincer Ligand

Tribocatalytically-activated carbon-based tribofilm formation for wear reduction in alkane environment

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