Selective oxidation of glycerol over nitrogen-doped carbon nanotubes supported platinum catalyst in base-free solution

Zhang, Mengyuan; Shi, Juanjuan; Sun, Yanyan; Ning, Wensheng; Hou, Zhaoyin

doi:10.1016/j.catcom.2015.08.002

Cited by 38 publications

(21 citation statements)

References 35 publications

(37 reference statements)

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“…After deposition on nitrogen-doped supports, the oxidation state of the Pt and the ratio between these three components is altered, even if a univocal trend cannot be derived. In most cases, an increase in the Pt 0 /Pt δ+ ratio was exposed [80,82]. In addition, the BE of the Pt is affected by the electronic interaction with nitrogen, undergoing a shift to higher energy values.…”

Section: X-ray Photoelectron Spectroscopy (Xps)mentioning

confidence: 99%

Understanding Heteroatom-Mediated Metal–Support Interactions in Functionalized Carbons: A Perspective Review

2018

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Featured Application: Surface engineering for catalysis and energy.Abstract: Carbon-based materials show unique chemicophysical properties, and they have been successfully used in many catalytic processes, including the production of chemicals and energy. The introduction of heteroatoms (N, B, P, S) alters the electronic properties, often increasing the reactivity of the surface of nanocarbons. The functional groups on the carbons have been reported to be effective for anchoring metal nanoparticles. Although the interaction between functional groups and metal has been studied by various characterization techniques, theoretical models, and catalytic results, the role and nature of heteroatoms is still an object of discussion. The aim of this review is to elucidate the metal-heteroatoms interaction, providing an overview of the main experimental and theoretical outcomes about heteroatom-mediated metal-support interactions. Selected studies showing the effect of heteroatom-metal interaction in the liquid-phase alcohol oxidation will be also presented.

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Section: X-ray Photoelectron Spectroscopy (Xps)mentioning

confidence: 99%

Understanding Heteroatom-Mediated Metal–Support Interactions in Functionalized Carbons: A Perspective Review

2018

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“…It should be noted that doping of carbon nanomaterials by nitrogen is not always accompanied by changes in the diffraction pattern. For example, in the works [32,34,35] multiwalled carbon nanotubes (MWCNTs) and N-CNTs had similar diffraction patterns. On the other hand, the authors of [36] observed for N-CNTs an additional asymmetric peak in the 2 region of ~ 13; and the appearance of this peak was not explained.…”

Section: Introductionmentioning

confidence: 99%

Observation of the superstructural diffraction peak in the nitrogen doped carbon nanotubes: Simulation of the structure

Suboch

Cherepanova

Kibis

et al. 2016

Fullerenes, Nanotubes and Carbon Nanostructures

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2016): Observation of the superstructural diffraction peak in the nitrogen doped carbon nanotubes: simulation of the structure, Fullerenes, Nanotubes and Carbon Nanostructures, A superstructural peak at ~12 in X-ray diffraction patterns of nitrogen-doped carbon nanotubes compared to the undoped carbon nanotubes was observed and assigned to the formation of spatially ordered defects. The simulation of the N-CNT structure using the graphitic g-C 3 N 4 phase and turbostratic ordering made it possible to propose a new model of the spatially ordered defects in the N-CNT layer, which consist of clusters of carbon vacancies and pyridinelike nitrogen. A correlation between this type of defects and electrical conductivity of the N-CNTs is defined.

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“…A survey of Pt nanoparticle synthesis on these newer forms of carbon over the last three years turns up the two dozen papers listed in Table 1. The most common method of preparation involves reductive deposition of soluble Pt precursors using ethylene glycol or sodium borohydride as the reducing agent [5][6][7][8][9][10][11][12][13][14][15][16]. These methods generally produce particles around 3-5 nm in diameter.…”

Section: Introductionmentioning

confidence: 99%

Electrostatic Adsorption of Platinum onto Carbon Nanotubes and Nanofibers for Nanoparticle Synthesis

Banerjee

Contreras-Mora

McQuiston

et al. 2018

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Strong Electrostatic Adsorption (SEA) has been demonstrated as a simple, scientific method to prepare well dispersed Pt nanoparticles over typical forms of carbon: activated, black, and graphitic carbons. Many varieties of specialty carbons have been invented in the last few decades including multi-walled nanotubes, nanofibers, graphene nanoplatelets, etc. In this work, we explore whether SEA can be applied to these specialty carbons for the synthesis of Pt nanoparticles. Over a number of oxidized and unoxidized multiwalled nanotubes and nanofibers, the point of zero charge (PZC) was measured and the uptake of anionic Pt complexes (Pt hexachloride, [PtCl 6 ] 2− , and cationic Pt complexes (platinum tetraammine, [Pt(NH 3 ) 4 ] 2+ ) as functions of final pH were surveyed. Pt nanoparticles on the various supports were synthesized at the optimal pH and were characterized by x-ray diffraction (XRD) and scanning transmission electron microscopy (STEM). The specialty carbons displayed volcano-shaped uptake curves typical of electrostatic adsorption for both Pt anions at low pH and Pt cations at high pH. However, the regimes of uptake often did not correspond to the measured PZC, probably due to surface impurities from the carbon manufacturing process. This renders the measured PZC of these specialty carbons unreliable for predicting anion and cation uptake. On the other hand, the anion and cation uptake curves provide an "effective" PZC and do indicate the optimal pH for the synthesis of ultrasmall nanoparticle synthesis. High resolution STEM imaging also showed that with SEA it is possible to disperse nanoparticles on the surface as well as the inner walls of the specialty carbons.

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Selective oxidation of glycerol over nitrogen-doped carbon nanotubes supported platinum catalyst in base-free solution

Cited by 38 publications

References 35 publications

Understanding Heteroatom-Mediated Metal–Support Interactions in Functionalized Carbons: A Perspective Review

Understanding Heteroatom-Mediated Metal–Support Interactions in Functionalized Carbons: A Perspective Review

Observation of the superstructural diffraction peak in the nitrogen doped carbon nanotubes: Simulation of the structure

Electrostatic Adsorption of Platinum onto Carbon Nanotubes and Nanofibers for Nanoparticle Synthesis

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