Excellent Catalytic Effects of Graphene Nanofibers on Hydrogen Release of Sodium alanate

Qian, Zhao; Hudson, M. Sterlin Leo; Raghubanshi, Himanshu; Pathak, Biswarup; Araújo, C. Moysés; Blomqvist, Andreas; Johansson, Börje; Srivastava, O.N.; Ahuja, Rajeev

doi:10.1021/jp300934h

Cited by 34 publications

(16 citation statements)

References 31 publications

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“…Similarly, a combination of experimental and theoretical calculations has been used to rationalize the catalytic activity of G nanofibers for hydrogen release from sodium alanate (NaAlH 4 ). 80 It was found that G nanofibers considerably improve hydrogen release from NaAlH 4 , which is of significance for the implementation of NaAlH 4 for environmentally friendly and effective hydrogen storage and release. DFT revealed that carbon atoms at sheet edges, regardless whether zigzag or armchair, can weaken Al-H bonds in sodium alanate.…”

Section: Edgesmentioning

confidence: 95%

Active sites on graphene-based materials as metal-free catalysts

et al. 2017

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Graphenes and related materials have attracted growing interest as metal-free catalysts. The present review is focused on describing the active sites that have been proposed to be responsible for the catalytic activity observed for such systems. It will be shown that diverse defects and chemical functionalities on the graphene layers can catalyze reactions, including oxygenated functional groups, carbon vacancies and holes, edge effects, and the presence of dopant elements. Besides discrete active sites, the catalytic activity arising from the collective properties of graphenes as materials by adsorbing substrates and reagents and activating them by charge transfer is also commented. The review has an introductory general section summarizing the general methodologies that have been used to support the proposed structure of the active sites, including theoretical calculations, comparison of the catalytic activity of graphene samples with different compositions, the use of organic molecules as models of the active centers, and selective masking of functional groups. The review is concluded with our view on future developments in the field.

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Section: Edgesmentioning

confidence: 95%

Active sites on graphene-based materials as metal-free catalysts

et al. 2017

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“…Каталітичну активність ВОГ у реакціях гідрування було показано на прикладі відновлення нітросполук до амінів за допомогою NaBH 4 , гідразингідрату та NaAlH 4 [6][7][8]. Також було виявлено, що ВОГ є каталітично активним у гідруванні органічних сполук молекулярним воднем у рідкій фазі за високого тиску [9,10].…”

Section: каталітичні властивості нановуглецевих матеріалів у реакції селективного гідрування ацетиленуunclassified

Catalytic properties of nanocarbon materials in reaction of selective hydrogenation of acetylene

Bychko¹,

Abakumov²,

Trypolskyi³

et al. 2021

New Functional Substances and Materials for Chemical Engineering

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The chapter presents the results of studies of the catalytic properties of nanocarbon materials based on carbon nanotubes and reduced graphene oxide in the hydrogenation of ethylene, acetylene and ethylene-acetylene mixture by molecular hydrogen at atmosphere pressure. The current state of scientific approaches to the creation of nanocarbon metal-free catalysts for the hydrogenation reactions in both liquid and gas phases is presented. A possible nature of active center of the hydrogenation reaction located on the surface of the nanocarbon material is discussed. It is shown that the catalytic activity of the nanocarbon materials is not associated with metal impurities. The correlation between the structural characteristics of carbon nanomaterials and their catalytic properties in the hydrogenation reactions of unsaturated hydrocarbons is demonstrated. A comparative analysis of the catalytic activity of nanocarbon materials and catalysts that contain noble metals in the hydrogenation reaction of acetylene is presented. Finally, the fundamental possibility of creating a nanocarbon catalyst for selective hydrogenation of acetylene in excess ethylene is shown.

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“…The main difference between these types of catalyst is the availability of active sites, which is responsible for the catalytic behavior. The fundamentals behind the catalytic activities of CNFs have also been investigated by the model interaction of NaAlH 4 with various edge sites of one single-layer graphene from fi rst principal theory, and the details of theoretical modeling results have been described by Qian et al [109]. Both zigzag edge and armchair edge are considered for the study (shown in Figure 4.11[a-f]).…”

Section: Longer Bondsmentioning

confidence: 99%

Catalytic Application of Carbon‐based Nanostructured Materials on Hydrogen Sorption Behavior of Light Metal Hydrides

Shahi¹,

Srivastava²

2013

Advanced Carbon Materials and Technology

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The development of hydrogen storage materials with favorable thermodynamics (e.g., kinetics, desorption/adsorption temperature) has attracted considerable attention in recent years. Alanates, amide-hydride mixtures and magnesium hydride are the candidates with the most potential storage material due to their high hydrogen storage capacity and good reversibility, but each has its own limitations (e.g., high desorption temperature and sluggish kinetics). Carbon has many allotropes such as graphite, activated carbon, fullerenes, carbon nanotubes, and the most recent, graphene, etc. These have novel properties which are useful in many new innovative applications. Several recent investigations have also demonstrated the benefi cial effect of carbon materials as catalyst for enhancing sorption behavior of different light hydrogen storage materials. Carbon with a small curvature radius exhibits prominent "catalytic" effect for light metal and complex hydrides. The reduction in curvature radius of carbon nanostructures enhances the electron affi nity and interaction of carbon with hydrogen because the hydrogen release/combination energy has been changed, and consequently, the de-/rehydrogenation kinetics of the material is improved. In this chapter, we will highlight the current advances (including our recent works) in the hydrogen sorption enhancement of metal and complex hydrides by incorporating carbon nanomaterials as a catalyst. There will be a particular emphasis on carbon nanotubes,

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Excellent Catalytic Effects of Graphene Nanofibers on Hydrogen Release of Sodium alanate

Cited by 34 publications

References 31 publications

Active sites on graphene-based materials as metal-free catalysts

Active sites on graphene-based materials as metal-free catalysts

Catalytic properties of nanocarbon materials in reaction of selective hydrogenation of acetylene

Catalytic Application of Carbon‐based Nanostructured Materials on Hydrogen Sorption Behavior of Light Metal Hydrides

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