Reducibility of Platinum Supported on Nanostructured Carbons

Plomp, Arie J.; Schubert, Tim; Storr, U.; Jong, Krijn P. de; Bitter, Johannes H.

doi:10.1007/s11244-008-9174-0

Cited by 15 publications

(11 citation statements)

References 28 publications

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“…After the nitric acid treatment of CNTs, surface oxygen-containing groups may retard the reduction of platinum nanoparticles supported on pre-oxidized CNTs, where the surface oxygen-containing groups strongly stabilized the cationic platinum species. 406 Removal of oxygen-containing species from CNTs suppresses acid-catalyzed side reactions and expedites electron transfer between CNTs and platinum nanoparticles, consequently improving both the activity and selectivity in cinnamaldehyde (CALD) hydrogenation. 200 Whereas, further functionalization with iron and cobalt nanoparticles on CNT surfaces after removing oxygen-containing groups leads to a metal-metal synergic effect and therefore elevates the activity and selectivity in CALD hydrogenation.…”

Section: Hydrogenation Reactions Cnts and Functionalizedmentioning

confidence: 99%

Carbon nanotube catalysts: recent advances in synthesis, characterization and applications

et al. 2015

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Carbon nanotubes are promising materials for various applications. In recent years, progress in manufacturing and functionalizing carbon nanotubes has been made to achieve the control of bulk and surface properties including the wettability, acid-base properties, adsorption, electric conductivity and capacitance. In order to gain the optimal benefit of carbon nanotubes, comprehensive understanding on manufacturing and functionalizing carbon nanotubes ought to be systematically developed. This review summarizes methodologies of manufacturing carbon nanotubes via arc discharge, laser ablation and chemical vapor deposition and functionalizing carbon nanotubes through surface oxidation and activation, doping of heteroatoms, halogenation, sulfonation, grafting, polymer coating, noncovalent functionalization and nanoparticle attachment. The characterization techniques detecting the bulk nature and surface properties as well as the effects of various functionalization approaches on modifying the surface properties for specific applications in catalysis including heterogeneous catalysis, photocatalysis, photoelectrocatalysis and electrocatalysis are highlighted.

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Section: Hydrogenation Reactions Cnts and Functionalizedmentioning

confidence: 99%

Carbon nanotube catalysts: recent advances in synthesis, characterization and applications

et al. 2015

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“…The reduction of the tune energy difference versus the XAFS energy difference was 62-80% mainly due to the finalstate relaxation effect. 4 …”

Section: X-ray Emission and State-selective Xanesmentioning

confidence: 99%

“…1 The morphologic effects of Pt nanoparticles, films, and alloys on the oxygen reduction reaction were reported. 1,21 In contrast that the Pt nanoparticles have been formed on various types of controlled C materials, [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] the electric contact of Pt with C has never been controlled and monitored nanoscopically.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Site Structure of a Replica Platinum−Carbon Composite Formed Utilizing Ordered Mesopores of Aluminum-MCM-41 for Catalysis in Fuel Cells

et al. 2009

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Platinum nanoparticles have been reported with mean sizes between 1.5 and 7 nm supported on carbon. The contact between Pt nanoparticles and C has never been controlled and monitored nanoscopically. In this paper, stable Pt nanoparticles with a mean size of 1.2 nm were synthesized embedded on/in a C matrix catalytically produced from acetylene over the Pt nanoparticles. The replica Pt-C composite was synthesized inside of the ordered mesopores (2.7 nm) of Al-MCM-41 followed by removal of the template. The contact between the Pt nanoparticle and C was experimentally observed by high-energy resolution Pt L 2 -edge XANES spectra tuned to 11065.7 eV, at a lower energy by 5 eV than the Pt L 1 peak top for the replica Pt-C pressed to electrolyte polymer (Nafion). The spectra were nicely reproduced in a theoretical spectrum using ab initio multiple scattering calculations for the interface Pt site between cuboctahedral Pt 38 and graphite layers. Other Pt sites detected in state-selective Pt L 2 -edge XANES were exclusively metallic for replica Pt-C/Nafion either in air or in H 2 . The thus-characterized replica Pt-C composite was tentatively tested as a cathode of a H 2 -air polymer electrolyte fuel cell in comparison to commercial 20 wt % Pt/Vulcan XC-72 as the cathode. The improvement of Pt dispersion stabilized on/in a C matrix, effective contact of Pt with C, and diffusion of O 2 in a few nanometers of replica Pt-C powder was suggested.

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“…CNF-h, CNT and CNF-p on the reducibility of Pt deposited on these carbons. 106 A retarded reduction for Pt/CNT was related to the higher amount of acidic oxygen surface groups on this support resulting in a strong stabilization of the cationic platinum species. A higher reduction temperature for that sample increased the amount of metallic Pt, however the platinum particle size was larger (2-11 nm) compared to that of Pt/CNF-h and Pt/CNF-p (both 1-3 nm).…”

Section: Scheme 71mentioning

confidence: 97%

Heterogeneous Catalysis on Nanostructured Carbon Material Supported Catalysts

2015

Nanostructured Carbon Materials for Catalysis

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For almost twenty years there has been an increasing interest in the use of nanostructured carbon materials as catalyst supports. 1-16 Following the nanotechnology wave, a wide variety of carbon nanomaterials has been investigated as catalyst supports, including fullerenes, CNTs, CNFs, carbon onions, nanodiamonds, FLG or GO. CNTs and CNFs, which constitute a new family of support offering a good compromise between the advantages of AC and high surface area graphite have been particularly studied. The main advantages offered by CNT or CNF supports are: 17 (i) the high purity of the material can avoid self-poisoning; (ii) the mesoporous nature of these supports can be of interest for liquid-phase reactions, thus limiting the mass transfer; (iii) the high thermal conductivity that limits hot-spots that can damage the catalyst; (iv) their well-defined and tunable structure; (v) their rich surface chemistry that offers numerous perspectives for adsorption and dispersion of the active phase; and (vi) the specific metal support interactions, due to high electrical conductivity of the support and to the tunable orientation of the graphene layers, that exist and that can directly affect catalytic activity and selectivity. The possibility to perform catalysis in a confined space is also of great interest. 6,18 From a theoretical viewpoint, graphene provides the ultimate two-dimensional model of a catalytic support. The reason is related to its high theoretical surface area (ca. 2630 m 2 g −1 ), high conductivity, unique graphitized basal plane structure and chemical tolerance. FLG,

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Reducibility of Platinum Supported on Nanostructured Carbons

Cited by 15 publications

References 28 publications

Carbon nanotube catalysts: recent advances in synthesis, characterization and applications

Carbon nanotube catalysts: recent advances in synthesis, characterization and applications

Synthesis and Site Structure of a Replica Platinum−Carbon Composite Formed Utilizing Ordered Mesopores of Aluminum-MCM-41 for Catalysis in Fuel Cells

Heterogeneous Catalysis on Nanostructured Carbon Material Supported Catalysts

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