Relative Catalytic Activities of Carbon Nanotube-Supported Metallic Nanoparticles for Room-Temperature Hydrogenation of Benzene

Yoon, Byunghoon; Pan, Horng‐Bin; Wai, Chien M.

doi:10.1021/jp809366w

Cited by 126 publications

(52 citation statements)

References 42 publications

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“…Supported platinum catalysts have been most intensively used in catalytic reactions, such as hydrogenation of hydrocarbons [17][18][19][20][21][22] and unsaturated aldehydes [12,[23][24][25], water-gas shift reaction [26], and many other processes [27,28] where the optimal carriers for platinum are a major issue. Magnesium aluminate spinel (MgAl 2 O 4 ) is a favorable material that is used as a catalyst carrier due to its good mechanical strength, high chemical inertness, and strong metalsupport interaction preventing sintering of metallic nanoparticles [28][29][30].…”

mentioning

confidence: 99%

Catalytic hydrogenation of benzaldehydes over platinum nanoparticles immobilized on magnesium aluminate spinel under mild conditions

Han

Zhang

et al. 2010

Reac Kinet Mech Cat

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Platinum nanoparticles, synthesized via ethanol reduction of hexachloroplatinic acid in the presence of poly-(N-vinyl-2-pyrrolidone), were anchored on magnesium aluminate spinel using a colloidal deposition method. The samples were characterized using the following methods: transmission electron microscopy, powder X-ray diffraction, scanning electron microscopy, and energy dispersive X-ray spectroscopy. The results revealed that platinum nanoparticles, with an average diameter of 2.8 nm, are homogenously dispersed on the surface of the carrier. Under very mild conditions, supported Pt/MgAl 2 O 4 catalysts demonstrated excellent catalytic activity and high selectivity in the hydrogenation reaction of benzaldehydes to benzyl alcohols. The reaction kinetics for the catalytic hydrogenation of 3-phenoxybenzaldehyde to 3-phenoxybenzyl alcohol on a Pt/MgAl 2 O 4 catalyst can be described by equation r ¼ k Â c 1:44 Â p H 2 , and the apparent activation energy is 35.6 kJ mol -1 .

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mentioning

confidence: 99%

Catalytic hydrogenation of benzaldehydes over platinum nanoparticles immobilized on magnesium aluminate spinel under mild conditions

Han

Zhang

et al. 2010

Reac Kinet Mech Cat

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“…3, bands corresponding to the metallic SWNTs are in the region of 350-600 nm and those of the semiconducting nanotubes are in the region of 550-1,400 nm [46]. For example, the dominant peak at 868 nm corresponds to (6,4) semiconducting tubes, measuring 0.71 nm in diameter. It should be noted that the disappearance of the peak at 398 nm corresponded to the conversion of palladium acetate to palladium nanoparticles.…”

Section: Resultsmentioning

confidence: 98%

“…Specifically, increased attention has been given to the integration of onedimensional nanotubes with zero-dimensional nanoparticles (NPs) to form hybrid structures [1,2]. These nanoparticlenanotube hybrids possess interesting structural and chemical properties, which can find applications in catalysis [3,4], hydrogen storage devices [5,6], electronic sensor devices [7] and many other unique applications [1,2,8,9]. Particularly, in catalytic systems, CNTs offer important advantages as a supporting material due to their high surface area to volume ratio, thermal and electrical conductivity, and chemical inertness [2].…”

Section: Introductionmentioning

confidence: 99%

“…Particularly, in catalytic systems, CNTs offer important advantages as a supporting material due to their high surface area to volume ratio, thermal and electrical conductivity, and chemical inertness [2]. In certain cases, it has been shown that the CNT-supported catalysts can be easily recovered by gravitational sedimentation or filtration [4,10]. This indicates that nanotube-based systems can be industrially viable candidates for recyclable catalysts, which will allow regeneration, recovery and reuse.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and Characterization of Novel Hybrids of Tris[3-(trimethoxysilyl)propyl] Isocyanurate (TTPI) Capped Palladium Nanoparticles and Single-Walled Carbon Nanotubes

Hemraj‐Benny

Chauhan

Zhang

et al. 2011

Silicon

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The conjugation of nanoparticles to carbon nanotubes (CNTs) involves various steps including premodification of the nanotubes, which is known to be a very tedious process and sometimes leads to a mixture of products. In this regard, a direct route to generate such conjugates is a worthwhile endeavor. In this paper, we report a novel, mild, one-pot, approach to a controlled and direct coordination of Pd nanoparticles (Pd NPs) onto the surface of single walled carbon nanotubes (SWNTs), without any pre-modification of the SWNTs surface. We also present detailed characterization of the SWNT-Pd NP hybrid systems using High Resolution Transmission Electron Microscopy (HRTEM), Energy Dispersive X-ray Spectroscopy (EDS), Mid-Infrared Spectroscopy (Mid-IR) and UV-Visible Spectroscopy (UV-vis) along with the stability studies of the nanoconjugates.

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“…Moreover, nanocomposite materials, in this case CNT-NPs (Carbon NanoTube-NanoParticles) nanocomposites achieve, due to synergy, improved properties, in particular electrical properties by integrating two types of materials: carbon and metal, therefore can be applied in sensors of chemical and biological substances, in which nanocomposites are a chemically active element [1,3,4]. The currently known nanocomposites consisting of carbon nanotubes together with nanoparticles of one (Au, Ag, Pt, Pd, Rh, Re) [5,6,[8][9][10] or more (Pd and Rh, Pt and Ru, Pt-Ru-Mo) [11][12][13] metals deposited on their surface are manufactured with diverse methods. In order to be able to apply CNT-NPs nanocomposites more effectively, a technology must be devised in modern industry enabling to control the uniform deposition of nanoparticles of a given metal onto the surface of carbon nanotubes.…”

Section: Introductionmentioning

confidence: 99%

The MWCNTs-Rh Nanocomposite Obtained By The New High-Temperature Method

Dobrzańska-Danikiewicz¹,

Cichocki²,

Łukowiec³

2015

Archives of Metallurgy and Materials

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A nanocomposite was fabricated during the research undertaken, consisting of multiwalled carbon nanotubes coated with rhodium nanoparticles by the new high-temperature method being the subject of the patent claim. High quality multiwalled carbon nanotubes (MWCNTs) with the length of 100÷500 nm and the diameter of 8÷20 nm obtained in advance with Catalytic Chemical Vapour Deposition (CVD) were employed in the investigations. The nanotubes manufactured under the own research contain small amounts of metallic impurities and amorphous carbon deposits. Multiwalled carbon nanotubes functionalisation in acids was applied to deposit rhodium nanoparticles onto the surface of carbon nanotubes, and then the material was placed in a solution being a precursor of rhodium nanoparticles. The material prepared was next placed in a quartz vessel and subjected to high-temperature reduction in the atmosphere of argon to deposit rhodium nanoparticles onto the surface of multiwalled carbon nanotubes. The following examinations were performed, respectively: MWCNTs fabrication, fabrication of a CNT-NPs (Carbon NanoTube-NanoParticles) nanocomposite material; the characterisation of the materials produced including examination of the structure and morphology, and the assessment of rhodium nanoparticles distribution on the surface of carbon nanotubes. Microand spectroscopy techniques were employed to characterise the structure of the nanocomposites obtained.Keywords: carbon nanotubes, nanocomposite materials, rhodium nanoparticles, transmission electron microscopy W ramach wykonanych badań wytworzono nanokompozyt składający się z wielościennych nanorurek węglowych pokrytych nanocząsteczkami rodu nową wysokotemperaturową metodą, będącą przedmiotem zgłoszenia patentowego. W badaniach wykorzystano wysokiej jakości wielościenne nanorurki węglowe MWCNTs o długości 100÷500 nm i średnicy 8÷20 nm uprzednio otrzymane w procesie katalityczno-chemicznego osadzania z fazy gazowej (CCVD). Wytworzone w ramach prac własnych nanorurki zawierają nieznaczne ilości zanieczyszczeń metalicznych i amorficznych depozytów węglowych. W celu osadzenia nanocząsteczek rodu na powierzchni nanorurek węglowych zastosowano funkcjonalizację wielościennych nanorurek węglowych w kwasach, następnie materiał umieszczono w roztworze będącym prekursorem nanocząsteczek rodu. Przygotowany materiał umieszczono w dalszej kolejności w kwarcowym naczyniu i poddano redukcji wysokotemperaturowej w atmosferze argonu w celu osadzenia nanocząsteczek rodu na powierzchni wielościennych nanorurek węglowych. Wykonane badania obejmują kolejno: wytworzenie MWCNTs, wytworzenie materiału nanokompozytowego typu nanorurki węglowe -nanocząsteczki (CNT-NPs), scharakteryzowanie wytworzonego materiału obejmujące badanie jego struktury i morfologii oraz ocenę rozmieszczenia nanocząsteczek rodu na powierzchni nanorurek węglowych. Dla scharakteryzowania struktury otrzymanych nanokompozytów zastosowano techniki mikro-i spektroskopowe.

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Relative Catalytic Activities of Carbon Nanotube-Supported Metallic Nanoparticles for Room-Temperature Hydrogenation of Benzene

Cited by 126 publications

References 42 publications

Catalytic hydrogenation of benzaldehydes over platinum nanoparticles immobilized on magnesium aluminate spinel under mild conditions

Catalytic hydrogenation of benzaldehydes over platinum nanoparticles immobilized on magnesium aluminate spinel under mild conditions

Synthesis and Characterization of Novel Hybrids of Tris[3-(trimethoxysilyl)propyl] Isocyanurate (TTPI) Capped Palladium Nanoparticles and Single-Walled Carbon Nanotubes

The MWCNTs-Rh Nanocomposite Obtained By The New High-Temperature Method

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