Pt nanoparticles interacting with graphitic nitrogen of N-doped carbon nanotubes: Effect of electronic properties on activity for aerobic oxidation of glycerol and electro-oxidation of CO

Ning, Xiaomei; Li, Yuhang; Wang, Hongjuan

doi:10.1016/j.jcat.2015.02.010

Cited by 164 publications

(91 citation statements)

References 57 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1a, Fig. S2 and Table S2) [31,33]. These results indicated that N atoms were incorporated into carbon skeletal of N-MWCNTs, and the relative percentage of graphitic N increased from 5 to 16.7% when the calcination temperature was raised from 673 to 973 K because of the rearrangement of nitrogen groups under high temperature (Table S2) [34].…”

Section: Glycerol Oxidationmentioning

confidence: 82%

“…At the same time, high-resolution of Pt 4f spectra (see Fig. 1b-d) also revealed that the amount of metallic Pt on the surface of N-MWCNTs is higher than that on pristine MWCNTs, and the detected ratio of Pt 0 /Pt δ+ increased with the content of N, which could be attributed to the strong electron donating effect of N-dopants in carbon skeleton [30][31][32]. But Pt NPs dispersed unevenly on the surface of N-free MWCNTs.…”

Section: Glycerol Oxidationmentioning

confidence: 99%

“…N-doped supports [30,31] and mesoporous carbon nitride [32] can improve the performance and stability of Pt NPs due to the electron donation from nitrogen to Pt. In this communication, N-doped MWCNTs (N-MWCNTs) was prepared via a facile calcinations of mixed MWCNTs and urea, Pt NPs were loaded on N-MWCNTs in ethylene glycol (EG) under microwave irradiation (see Scheme 1).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Zhang

Shi

Sun

et al. 2015

Catalysis Communications

View full text Add to dashboard Cite

Section: Glycerol Oxidationmentioning

confidence: 82%

Section: Glycerol Oxidationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Zhang

Shi

Sun

et al. 2015

Catalysis Communications

View full text Add to dashboard Cite

“…Among the various dopants, nitrogen attracted most interest [15,[20][21][22]. and applications of transition metal/N-doped graphene (NGr) based catalytic systems ranges from oxygen reduction reactions (ORR) [23][24][25][26], hydrogen evolving reactions (HER) [27,28], photocatalysis [29,30], oxidation [31][32][33][34][35][36][37][38], and reduction [39][40][41][42][43][44] reactions of organic molecules, C-C bond formation [45] to many others [46][47][48][49][50][51]. Hence, merging rationally-designed suitable modified supports with cheap transition metals permits access to the design of active, selective and cheap catalytic materials thus allowing to match or to outperform noble-metal-based catalysts.…”

Section: Introductionmentioning

confidence: 99%

Co-based heterogeneous catalysts from well-defined α-diimine complexes: Discussing the role of nitrogen

Formenti

Ferretti

Topf

et al. 2017

Journal of Catalysis

View full text Add to dashboard Cite

‡ These authors contributed equally to this work.Abstract: Ar-BIANs and related α-diimine Co complexes were wet impregnated onto Vulcan® XC 72 R carbon black powder and used as precursors for the synthesis of heterogeneous supported nanoscale catalysts by pyrolysis under argon at 800 °C. The catalytic materials feature a core-shell structure composed of metallic Co and Co oxides decorated with nitrogen-doped graphitic layers (NGr). These catalysts display high activity in the liquid phase hydrogenation of aromatic nitro compounds (110 °C, 50 bar H2) to give chemoselectively substituted aryl amines. The catalytic activity is closely related to the amount and type of nitrogen atoms in the final catalytic material, which suggests a heterolytic activation of dihydrogen.Keywords: cobalt, hydrogenation, nitro compounds, kinetic, heterolytic activation IntroductionCatalysis is a key-technology for the manufacturing of all kinds of bulk and fine chemical products. It allows for producing chemicals avoiding the formation of undesired and useless stoichiometric side products which leads to additional cost and energy consumption [1][2][3]. Many of the industrially relevant catalytic processes in the fine chemical industry are still based on expensive and rare late transition metals such as Pd, Pt, Rh, Ru and Ir [4,[1][2][3][4][5]. Although these metals exhibit very good catalytic performance for advanced organic substrates, the decreasing availability of these elements requires the development of efficient alternative metal-based catalysts [6]. In this regard, the design of catalytic systems based on abundant and biocompatible metals is an important goal for the implementation and progress of green and sustainable chemistry. Hence, transition metals such as Fe, Co and Cu are ideal candidates, which meet these requirements [7][8][9][10]. As a matter of fact, these elements are among the most abundant metals in the Earth's upper crust, thus being readily accessible [11]. Recently, heteroatom-doped carbon materials attracted major interest in the field of metal supported heterogeneous catalysts for both chemical synthesis [12][13][14] and/or energy-relevant transformations [15,16]. Indeed, doping graphene with heteroatoms such as N, B, P, or S leads to a radical modification of the electronic properties of both the support and the supported metal [17][18][19]. Consequently, it is possible to modify the activity and adjust the selectivity of the final catalytic material towards the desired transformation. Among the various dopants, nitrogen attracted most interest [15,[20][21][22]. and applications of transition metal/N-doped graphene (NGr) based catalytic systems ranges from oxygen reduction reactions (ORR) [23][24][25][26], hydrogen evolving reactions (HER) [27,28], photocatalysis [29,30], oxidation [31][32][33][34][35][36][37][38], and reduction [39][40][41][42][43][44] reactions of organic

show abstract

“…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

View full text Add to dashboard Cite

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.

show abstract

Pt nanoparticles interacting with graphitic nitrogen of N-doped carbon nanotubes: Effect of electronic properties on activity for aerobic oxidation of glycerol and electro-oxidation of CO

Cited by 164 publications

References 57 publications

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

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

Co-based heterogeneous catalysts from well-defined α-diimine complexes: Discussing the role of nitrogen

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

Contact Info

Product

Resources

About