A novel approach to Co/CNTs catalyst via chemical vapor deposition of organometallic compounds

Zhang, Hongzhe; Qiu, Jieshan; Liang, Changhai; Li, Zhonglai; Wang, Xiuna; Wang, Yunpeng; Feng, Zhaochi; Li, Can

doi:10.1007/s10562-005-4893-3

Cited by 31 publications

(24 citation statements)

References 24 publications

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“…After vaporization, vaporized powder was dried at 383 K overnight. Then, the samples were reduced in flowing 5% H 2 /Ar as the reducing gas, during which reduction conditions were first heated at 5 K/min, and kept at 673 K for 2 h. Reduction temperature was chosen because Zhang et al suggested that cobalt oxides was reduced over 623 K [21].…”

Section: Preparation Of Cobalt Supported Mwcntsmentioning

confidence: 99%

X-ray Photoelectron Spectroscopy Study of Cobalt Supported Multi-walled Carbon Nanotubes Prepared by Different Precursors

Lee¹,

Kim²,

Lim³

et al. 2007

Carbon letters

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The effect of cobalt precursor on the structure of Co supported multi-walled carbon nanotubes (MWCNTs) were studied by using X-ray photoelectron spectroscopy (XPS). MWCNTs were treated with a mixture of nitric and sulfuric acids and decorated with cobalt and/or cobalt oxides via aqueous impregnation solutions of cobalt nitrate or cobalt acetate followed by reduction in hydrogen. XPS was mainly used to investigate the phase of cobalt on MWCNTs after reduction with H 2 flow at 400 o C for 2 h. Higher cobalt-nanoparticle dispersion was found in the MWCNTS prepared via cobalt nitrate decomposition. A typical XPS spectrum of Co 2p showed the peaks at binding energy (BE) values equal to 781 and 797 eV, respectively. It is found that cobalt nitrate supported MWCNTs is more dispersive and have catalytic activity than that of cobalt acetate supported MWCNTs at same preparation condition such as concentration of precursor solution and reduction environment.

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Section: Preparation Of Cobalt Supported Mwcntsmentioning

confidence: 99%

X-ray Photoelectron Spectroscopy Study of Cobalt Supported Multi-walled Carbon Nanotubes Prepared by Different Precursors

Lee¹,

Kim²,

Lim³

et al. 2007

Carbon letters

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“…Recent reports include platinum [6,8,9], cobalt [10,11], nickel [7,12], gold [13], rhodium [14] as well as platinum nickel [15], platinum tin [16] and platinum ruthenium [17] NPs immobilized on CNTs [18]. Alloying NPs of platinum with nickel, cobalt, or iron allows tunable magnetic response [19,20] and catalytic properties [21][22][23].…”

mentioning

confidence: 99%

“…Beyond that, 1D alignment of NPs enables to modify the saturation magnetization and coercitivity through magnetostatic coupling [24][25][26]. A convenient way for 1D alignment is the attachment of NPs to CNTs, which is usually achieved by electrochemical deposition [27,28], the reduction of metallic salts in the presence of functionalized CNTs [15,29], or chemical vapor deposition [10], among others [30]. On the other hand, concerning the NP synthesis, the organometallic synthesis route provides nanocrystalline alloyed materials with precise size control and tunable composition in several systems [20,31,32].…”

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confidence: 99%

Reversible Attachment of Platinum Alloy Nanoparticles to Nonfunctionalized Carbon Nanotubes

et al. 2010

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The formation of monodisperse, tunable sized, alloyed nanoparticles of Ni, Co, or Fe with Pt and pure Pt nanoparticles attached to carbon nanotubes has been investigated. Following homogeneous nucleation, nanoparticles attach directly to non-functionalized singlewall and multiwall carbon nanotubes during nanoparticle synthesis as a function of ligand nature and the nanoparticle work function. These ligands do not only provide a way to tune the chemical composition, size and shape of the nanoparticles but also control a strong reversible interaction with carbon nanotubes and permit controlling the nanoparticle coverage. Raman spectroscopy reveals that the sp2 hybridization of the carbon lattice is not modified by the attachment. In order to better understand the interaction between the directly attached nanoparticles and the non-functionalized carbon nanotubes we employed first-principles calculations on model systems of small Pt clusters and both zig-zag and armchair singlewall carbon nanotubes. The detailed comprehension of such systems is of major importance since they find applications in catalysis and energy storage.Composites of metallic nanoparticles (NPs) and carbon nanotubes (CNTs) exhibit high catalytic activity for various chemical reactions [1][2][3][4][5][6] and have also been explored for hydrogen storage applications [7]. Recent reports include platinum [6,8,9] [19,20] and catalytic properties [21][22][23]. Beyond that, 1D alignment of NPs enables to modify the saturation magnetization and coercitivity through magnetostatic coupling [24][25][26]. A convenient way for 1D alignment is the attachment of NPs to CNTs, which is usually achieved by electrochemical deposition [27,28], the reduction of metallic salts in the presence of functionalized CNTs [15,29], or chemical vapor deposition [10], among others [30]. On the other hand, concerning the NP synthesis, the organometallic synthesis route provides nanocrystalline alloyed materials with precise size control and tunable composition in several systems [20,31,32]. Here, we report on the synthesis of alloyed N i x P t 1−x [20], Co x P t 1−x and F e x P t 1−x [32] NPs as well as pure P t [33] NPs and their attachment to non-functionalized singlewall (SWCNTs), multiwall carbon nanotubes (MWCNTs) and glassy carbon by their simple integration in the organometallic synthesis. The experimental procedure involves only a single synthetic step, whereby the crucial parameter for attachment was found in the correct balance of the ligands oleylamine (OA) and oleic acid (Oac).

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“…Recently, several Co or Rh metal catalysts supported on inorganic supports have also been investigated for the hydroformylation of olefins [12][13][14][15][16][17][18]. It has been reported that Co/activated carbon catalysts showed good catalytic performance in hydroformylation of 1-hexene in alcoholic solvents [13].…”

Section: Introductionmentioning

confidence: 99%

“…Among Rh/AC, Pd/AC, Ru/AC and Pt/AC catalysts, Rh/AC catalyst exhibited the best performance in the low-pressure hydroformylation of 1-hexene. Zhang et al [15] reported that a Co/CNTs catalyst, which was prepared by metal organic chemical vapor deposition technique, showed high activity and region selectivity in the hydroformylation of 1-octene [17]. Although some progress on the research works in the application of solid catalysts to the hydroformylation of olefins has been achieved, the activity and stability of the supported Co catalysts are still not satisfactory and the further efforts are necessary.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Behaviors of Amorphous Co-B Catalysts in Hydroformylation of 1-Octene

Peng

2009

Catal Lett

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An amorphous Co-B catalyst was prepared by chemical reduction method and characterized by isothermal N 2 adsorption/desorption, XRD, ICP-AES and HR-TEM. The catalytic activity of the Co-B catalyst in the hydroformylation of 1-octene was evaluated in a 100 mL stainless autoclave. Fresh amorphous Co-B catalyst showed a relatively high activity in the hydroformylation of 1-octene. The thermal stability of fresh Co-B catalyst was also examined. When fresh Co-B catalyst was thermally treated in N 2 or H 2 atmosphere at 200-500°C for 2 h, the specific surface area and the catalytic activity of the Co-B catalyst decreased. When Co-B was supported on SiO 2 , the activity of the catalyst increased obviously. Compared with conventional supported Co/SiO 2 catalyst, Co-B/SiO 2 showed much higher activity than Co/SiO 2 . The influences of solvents and reaction conditions on the catalytic activity of the amorphous Co-B catalyst were also studied. The recycle test of the amorphous Co-B catalyst was done.

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A novel approach to Co/CNTs catalyst via chemical vapor deposition of organometallic compounds

Cited by 31 publications

References 24 publications

X-ray Photoelectron Spectroscopy Study of Cobalt Supported Multi-walled Carbon Nanotubes Prepared by Different Precursors

X-ray Photoelectron Spectroscopy Study of Cobalt Supported Multi-walled Carbon Nanotubes Prepared by Different Precursors

Reversible Attachment of Platinum Alloy Nanoparticles to Nonfunctionalized Carbon Nanotubes

Catalytic Behaviors of Amorphous Co-B Catalysts in Hydroformylation of 1-Octene

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