Hydrogen surface modification of a carbon nanotube catalyst for the improvement of ethane oxidative dehydrogenation

Zhou, Zheng; Orcutt, Emma K.; Anderson, Hans C.

doi:10.1016/j.carbon.2019.06.076

Cited by 13 publications

(4 citation statements)

References 55 publications

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“…CO release in the medium temperature region testifies to the presence of carboxy groups in the oxidized samples; in the presence of hydrogen, these groups will selectively oxidize to phenol groups [48][49][50]. The reduction of carboxy groups (-COOH) to phenylic groups (C-OH) on the surface of CNTs oxidized by hydrogen peroxide was observed at 450-700 °C [49,50]. Lactone groups and carboxy anhydride groups are reduced at temperatures above 430 °C with a release of CO and CO 2 [48], which may testify to their presence in T1N and T1N wash samples, although CO 2 was not detected in this temperature region.…”

Section: Stability Of Functional Groups On the Cnt Surface Estimated mentioning

confidence: 99%

Effect of Acid Treatment on the Functionalization of Surface, Structural and Textural Properties of Carbon Nanotubes Taunit

Ismagilov

Yashnik

Shikina

et al. 2019

Eurasian Chem. Tech. J.

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The role of acid treatment of Taunit carbon nanotubes in the formation of oxygen-containing functional groups on its surface as well as morphological and textural properties was studied. Acid treatment was carried out in an HNO3 solution or its mixture with H2SO4 under mild conditions (85 °C/1 h) with subsequent washing with distilled water or without washing. Properties of the initial and oxidized samples were investigated using elemental carbon, hydrogen, nitrogen, oxygen (CHNO) analysis, BET (Brunauer-Emmett-Teller) determination of surface area, X-ray diffraction, Raman and Fourier Transform Infrared Spectroscopy (FTIR) spectroscopy, and hydrogen temperature-programmed reduction. Treatment with HNO3 and HNO3/H2SO4 mixture was shown to be efficient for the formation of various oxygen-containing groups on the Taunit surface; therewith, the water washing step also contributed to functionalization of the surface. Depending on the oxidant, acid treatment increased graphite and oxygen content in the samples by a factor of 3‒4.5. Treatment with HNO3 without water washing exerted a weak effect on the graphite structure ordering, the concentration of aliphatic groups was high as compared to other oxidation conditions. Treatment of Taunit with the HNO3/H2SO4 mixture, on the contrary, increased the number of defects in graphite layers and decreased the concentration of aliphatic structures.

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Section: Stability Of Functional Groups On the Cnt Surface Estimated mentioning

confidence: 99%

Effect of Acid Treatment on the Functionalization of Surface, Structural and Textural Properties of Carbon Nanotubes Taunit

Ismagilov

Yashnik

Shikina

et al. 2019

Eurasian Chem. Tech. J.

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“…97,98 The uorinated CNTs have C-F bonds that are weaker than those in alkyl uorides, 99 thus providing substitution sites for additional functionalisation. 100 Besides sidewall uorination of CNTs, other similar methods including cycloaddition, such as Diels-Alder reaction, carbene and nitrene addition, 101,102 chlorination, 103 bromination, 104 hydrogenation, 105 azomethine ylides, 106 have also been successfully functionalised and employed. All these methods can be regarded as derivatives of sidewall functionalisation of CNTs.…”

Section: Covalent Functionalisation Of Cntsmentioning

confidence: 99%

Carbon nanotubes: functionalisation and their application in chemical sensors

et al. 2020

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“…Carbon nanotubes allow the achievement of multifold expansion of the real electrochemically active surface and reduce amounts of catalysts used per unit area of oxygen electrode [6]. The possibility of surface functionalization of nanotubes by attaching the desired side groups like phenolic [7], aryl [8][9][10], and heterocyclic groups [11], allows for the immobilization of various catalysts [12,13].…”

Section: Introductionmentioning

confidence: 99%

Functionalization of MWCNTs for Bioelectrocatalysis by Bacterial Two-Domain Laccase from Catenuloplanes japonicus

Abdullatypov,

Oskin,

Fedina

et al. 2023

Nanomaterials

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This study was carried out in order to assess several modifications of carbon nanotube-based nanomaterials for their applications in laccase electrodes and model biofuel cells. The modified MWCNTs served as adapters for the immobilization of laccase from Catenuloplanes japonicus VKM Ac-875 on the surface of electrodes made of graphite rods and graphite paste. The electrochemical properties of the electrodes were tested in linear and cyclic voltammetrical measurements for the determination of the redox potential of the enzyme and achievable current densities. The redox potential of the enzyme was above 500 mV versus NHE, while the highest current densities reached hundreds of µA/cm2. Model biofuel cells on the base of the laccase cathodes had maximal power values from 0.4 to 2 µW. The possibility of practical application of such BFCs was discussed.

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Hydrogen surface modification of a carbon nanotube catalyst for the improvement of ethane oxidative dehydrogenation

Cited by 13 publications

References 55 publications

Effect of Acid Treatment on the Functionalization of Surface, Structural and Textural Properties of Carbon Nanotubes Taunit

Effect of Acid Treatment on the Functionalization of Surface, Structural and Textural Properties of Carbon Nanotubes Taunit

Carbon nanotubes: functionalisation and their application in chemical sensors

Functionalization of MWCNTs for Bioelectrocatalysis by Bacterial Two-Domain Laccase from Catenuloplanes japonicus

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