Size effect of Fe nanoparticles supported on carbon nanotubes on their activity and selectivity in the hydrogenation of crotonaldehyde

Bychko, Igor; Kalishyn, Ye. Yu.; Strizhak, P. E.

doi:10.1007/s11237-012-9261-y

Cited by 8 publications

(3 citation statements)

References 12 publications

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“…Various methods have been developed for the preparation of iron oxide nanoparticles such as: co-precipitation method; hydrothermal synthesis techniques are an alternative method for the preparation of highly crystalline iron oxide nanoparticles, microemulsion and inverse microemulsion, thermal decomposition of organic precursors, sol-gel technique, wet grinding method, reduction of hematite by CO/CO 2 , c-ray radiation, hydrolysis and oxidation of Fe(OH) 2 by H 2 O 2 [21][22][23][24][25][26][27][28][29]. In order to design nanoparticles for specific applications, surface structure, atomic structure of the particle and its magnetic structure or spin dynamics should be known.…”

Section: Introductionmentioning

confidence: 99%

Preparation, characterization and dynamical mechanical properties of dextran-coated iron oxide nanoparticles (DIONPs)

Can

Kavlak

Parvizikhosroshahi

et al. 2017

Artificial Cells, Nanomedicine, and Biotechnology

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Dextran-coated iron oxide nanoparticles (DIONPs) with appropriate surface chemistry exhibit many interesting properties that can be exploited in a variety of biomedical applications such as magnetic resonance imaging (MRI) contrast enhancement, tissue repair, hyperthermia, drug delivery and in cell separation. This paper reports the experimental detail for preparation, characterization and investigation of thermal and dynamical mechanical characteristics of the dextran-coated FeO magnetic nanoparticles. In our work, DIONPs were prepared in a 1:2 ratio of Fe(II) and Fe(III) salt in the HCl solution with NaOH at given temperature. The obtained dextran-coated iron-oxide nanoparticles structure-property correlation was characterized by spectroscopic methods; attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR) and XRD. Coating dextran on the iron-oxide proof of important peaks can be seen from the ATR-FTIR. Dramatic crystallinity increment can be observed from the XRD pattern of the iron-oxide dextran nanoparticles. The thermal analysis was examined by differential scanning calorimetry (DSC), thermal gravimetric analysis (TGA) and differential thermal analysis (DTA). Dynamical mechanical properties of dextran nanoparticles were analysed by dynamic mechanical analysis (DMA). Thermal stability of the iron oxide dextran nanoparticles is higher than that of the dextran.

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Section: Introductionmentioning

confidence: 99%

Preparation, characterization and dynamical mechanical properties of dextran-coated iron oxide nanoparticles (DIONPs)

Can

Kavlak

Parvizikhosroshahi

et al. 2017

Artificial Cells, Nanomedicine, and Biotechnology

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“…As shown in Table 1, Co-CNTs can act as high-efficiency catalysts with short reaction times and high yields of the obtained products. In general, the main advantages of CNT supports compared to activated carbon (AC) are the high purity of the material, which can avoid self-poisoning, exceptionally high mechanical strength, medium to high specific surface areas, high thermal conductivity, high external surface area, and specific metal support interactions that can directly affect the catalytic activity, the full accessibility of the reactants to the active sites, and selectivity [36]. From the data in Table 1, it can be concluded that the presence of the electron-withdrawing substituents on the aromatic ring can increase the reaction rate and, as a result, the reaction times are shortened and the yields are increased while the electron-donating substituents have diverse effects.…”

Section: Resultsmentioning

confidence: 99%

Environmentally friendly synthesis of 2-aryl-2,3-dihydroquinazolin-4(1H)-ones by novel Co-CNTs as recoverable catalysts

Safari¹,

Gandomi‐Ravandi²

2013

Comptes Rendus. Chimie

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The objective of this study is to investigate the possibility of using Co-CNTs as a green reaction medium and a catalyst for the cyclo-condensation of o-aminobenzamide with various aldehydes. This inexpensive, non-toxic, and readily available catalyst efficiently catalyzes the above condensation for the synthesis of 2-aryl-2,3-dihydroquinazolin-4(1H)-ones. Compared to the classical reaction, this is a simple, highly yielding, time saving, and environmentally friendly method.

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“…111,112 The catalytic properties of Fe nanoparticles of size 4-8 nm, deposited on CNTs, in the hydrogenation of crotonaldehyde have been studied. 113 It has been shown that the activity of the catalysts depends in an irregular manner on their dimensions and covers the range (1.6-5.0) × 10 −6 mol m −2 s −1 . It has been established that the selectivity of the hydrogenation products is maximal for supported NPs with 6.8 nm.…”

Section: Scheme 71mentioning

confidence: 99%

Heterogeneous Catalysis on Nanostructured Carbon Material Supported Catalysts

2015

Nanostructured Carbon Materials for Catalysis

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For almost twenty years there has been an increasing interest in the use of nanostructured carbon materials as catalyst supports. 1-16 Following the nanotechnology wave, a wide variety of carbon nanomaterials has been investigated as catalyst supports, including fullerenes, CNTs, CNFs, carbon onions, nanodiamonds, FLG or GO. CNTs and CNFs, which constitute a new family of support offering a good compromise between the advantages of AC and high surface area graphite have been particularly studied. The main advantages offered by CNT or CNF supports are: 17 (i) the high purity of the material can avoid self-poisoning; (ii) the mesoporous nature of these supports can be of interest for liquid-phase reactions, thus limiting the mass transfer; (iii) the high thermal conductivity that limits hot-spots that can damage the catalyst; (iv) their well-defined and tunable structure; (v) their rich surface chemistry that offers numerous perspectives for adsorption and dispersion of the active phase; and (vi) the specific metal support interactions, due to high electrical conductivity of the support and to the tunable orientation of the graphene layers, that exist and that can directly affect catalytic activity and selectivity. The possibility to perform catalysis in a confined space is also of great interest. 6,18 From a theoretical viewpoint, graphene provides the ultimate two-dimensional model of a catalytic support. The reason is related to its high theoretical surface area (ca. 2630 m 2 g −1 ), high conductivity, unique graphitized basal plane structure and chemical tolerance. FLG,

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Size effect of Fe nanoparticles supported on carbon nanotubes on their activity and selectivity in the hydrogenation of crotonaldehyde

Cited by 8 publications

References 12 publications

Preparation, characterization and dynamical mechanical properties of dextran-coated iron oxide nanoparticles (DIONPs)

Preparation, characterization and dynamical mechanical properties of dextran-coated iron oxide nanoparticles (DIONPs)

Environmentally friendly synthesis of 2-aryl-2,3-dihydroquinazolin-4(1H)-ones by novel Co-CNTs as recoverable catalysts

Heterogeneous Catalysis on Nanostructured Carbon Material Supported Catalysts

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