Mesoporous carbon nanotubes for use as support in catalysis and as nanosized reactors for one-dimensional inorganic material synthesis

Nhut, Jean‐Mario; Pesant, Laurie; Tessonnier, Jean‐Philippe; Winé, Gauthier; Guille, J.; Pham‐Huu, Cuong; Ledoux, Marc J.

doi:10.1016/s0926-860x(03)00482-4

Cited by 124 publications

(81 citation statements)

References 75 publications

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“…In addition, the morphology of carbon nanotubes as rolling graphene layers might influence the adsorption of the molecules and hence the catalytic performance. Besides, their particular electronic properties can induce a positive charge on the metal species due to electron transfer [7], this activating the N=O bond. However, to obtain an optimal size of the nanoparticles a previous oxidation step is frequently needed which may affect the catalytic performance [6].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of palladium nanoparticles on carbon nanotubes and graphene for the chemoselective hydrogenation of para-chloronitrobenzene

Dongil

Pastor‐Pérez

Fierro

et al. 2016

Catalysis Communications

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We have studied the synthesis of palladium nanoparticles over carbon nanotubes (Pd/CNT) and graphene (Pd/G) and we have tested their catalytic performance in the liquid phase chemoselective hydrogenation of para-chloronitrobenzene at room temperature. The catalysts were characterized by N 2 adsorption/desorption isotherms, TEM, X-ray diffraction, infrared and X-ray photoelectron spectroscopy and ICP-OES.The palladium particle size on Pd/G (3.4 nm) and Pd/CNT (2.8 nm) was similar though the deposition was higher on Pd/G. Pd/CNT was more active which can be ascribed to the different surface area and electronic properties of the Pd nanoparticles over CNT, while the selectivity was 100% to the corresponding haloaniline over both catalysts and they were quite stable upon recycling.

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Section: Introductionmentioning

confidence: 99%

Synthesis of palladium nanoparticles on carbon nanotubes and graphene for the chemoselective hydrogenation of para-chloronitrobenzene

Dongil

Pastor‐Pérez

Fierro

et al. 2016

Catalysis Communications

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“…In this sense, the use of carbon nanotubes (CNT) can offer further aid as they have proved to display special properties compared to other supports influencing the size, location and morphology of the metal nanoparticles [9,10]. In some cases it has been suggested that they are responsible of positively charged metal species due to electron transfer [11]. In addition, its special morphology as a rolling graphene layer(s) may also influence the adsorption of reactants/products and hence the catalytic performance [9].…”

Section: Introductionmentioning

confidence: 99%

Ir supported over carbon materials for the selective hydrogenation of chloronitrobenzenes

et al. 2015

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In the present work we have studied the effect of carbon supports with different graphitic character (carbon nanotubes, mesoporous graphite and activated carbon) on the catalytic performance of iridium nanoparticles on the liquid phase chemoselective hydrogenation of para-chloronitrobenzene at room temperature. The effect of the oxygen groups was also evaluated by oxidizing a portion of the carbon nanotubes. The Raman and XRD spectra showed that the mesoporous graphite displayed the strongest graphitic character. The characterization of the catalysts by HR-TEM, XPS and TPR-H2, showed that the catalysts had similar particle size and that the catalysts prepared over the previously oxidized support, Ir/CNTox, was not fully reduced. The activity and selectivity achieved with the catalyst Ir/CNT was the best among the samples and the presence of irdium oxide on Ir/CNTox diminished the yield to p-chloroaniline, being the worse catalyst. The reactivity of different isomers was also studied over Ir/CNT and it followed the order m > o > p. This is a previous version of the article published in Catalysis Today. 2015Today. , 249: 72-78. doi:10.1016Today. /j.cattod.2014 Highlights -Ir catalysts supported on carbon materials with different graphitic character.-The effect of oxygen groups in carbon nanotubes has been evaluated.-Ir/CNT shows the best catalytic performance in p-chloronitrobenzene hydrogenation.-The reactivity of different isomers on Ir/CNT was m > o > p. AbstractIn the present work we have studied the effect of carbon supports with different graphitic character (carbon nanotubes, mesoporous graphite and activated carbon) on the catalytic performance of iridium nanoparticles on the liquid phase chemoselective hydrogenation of para-chloronitrobenzene at room temperature. The effect of the oxygen groups was also evaluated by oxidizing a portion of the carbon nanotubes. TheRaman and XRD spectra showed that the mesoporous graphite displayed the strongest graphitic character. The characterization of the catalysts by HR-TEM, XPS and TPR-H 2 , showed that the catalysts had similar particle size and that the catalysts prepared over the previously oxidized support, Ir/CNTox, was not fully reduced. The activity and selectivity achieved with the catalyst Ir/CNT was the best among the samples and the presence of irdium oxide on Ir/CNTox diminished the yield to p-chloroaniline, *Manuscript Click here to view linked References being the worse catalyst. The reactivity of different isomers was also studied over Ir/CNT and it followed the order m > o > p.

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“…The attractive characteristics of ultrathin nanowires are summarized in Figure 1. One aspect correlated with decreased diameter is the increased surface area, which in turn, has immediate repercussions on sensors, [7] catalyst supports, [8] and environmental-remediation applications. [9,10] Less obviously, the decrease in size of the nanowires leads to a certain degree, to an increased colloidal stability: the gravitational force is easier to counteract by applying colloidal-stabilization strategies involving coulombic repulsion or steric stabilization.…”

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confidence: 99%

Ultrathin Nanowires—A Materials Chemistry Perspective

2009

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The recent years have seen an explosive interest in one‐dimensional nanostructures1, as testified by the number of citations this field has accrued; as customary, its blossoming was enabled by chemical breakthroughs that allowed the reproducible and affordable synthesis of such structures.2, 3 The limitations of those syntheses was in the diameter of the nanowires that it could produce (hardly < 10 nm), and in the use of expensive and low‐yield techniques, such as chemical vapor deposition (CVD). This paper attempts to summarize the very recent chemical breakthroughs that have allowed the production of ultrathin nanowires, often in solution, and often in gram‐scale quantities. By no means is this a comprehensive coverage of the field, which can in part be found in other excellent reviews1, 2, 4–6 but a selection of those contributions that we feel would most help put this emerging field in perspective. We will review the various synthetic strategies, their pros and cons, and we will give our best guesses as to the future directions of the field and what we can expect from it.

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Mesoporous carbon nanotubes for use as support in catalysis and as nanosized reactors for one-dimensional inorganic material synthesis

Cited by 124 publications

References 75 publications

Synthesis of palladium nanoparticles on carbon nanotubes and graphene for the chemoselective hydrogenation of para-chloronitrobenzene

Synthesis of palladium nanoparticles on carbon nanotubes and graphene for the chemoselective hydrogenation of para-chloronitrobenzene

Ir supported over carbon materials for the selective hydrogenation of chloronitrobenzenes

Ultrathin Nanowires—A Materials Chemistry Perspective

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