Concepts in Nanocatalysis

Philippot, Karine; Serp, Philippe

doi:10.1002/9783527656875.ch1

Cited by 49 publications

(54 citation statements)

References 228 publications

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“…When decreasing the size to a nanometer scale, nanocatalysts with intrinsic "nano effects" can boost turnover frequency (TOF) that cannot be achieved using their bulk compartments. One of these "nano effects" is their high percentage of surface atoms, particularly edge and corner atoms, which increases with a smaller particle size [4]. These surface atoms having a lower coordination number compared to the lattice are considered to be catalytically more active.…”

Section: Introductionmentioning

confidence: 99%

“…Current synthetic advances offer a rational design of sizes (~1 to 100 nm), shapes and morphologies (spheres, rods, wires, tubes, cubes and polyhedrons) of these noble metal nanocatalysts [5][6][7][8][9]. The effect of particle sizes, topologies and surface crystal facets on catalytic activity of noble metal nanocatalysts has been well documented and reviewed [1,4,8,[10][11][12][13]. However, wet-chemical preparation of noble metal nanocatalysts involves the utilization of specific surfactants that can bind the surface of nanocatalysts as ligands to control the nanostructures and prevent the coalescence of nanocatalysts by lowering the free energy of the surface.…”

Section: Introductionmentioning

confidence: 99%

“…Compared to homogeneous catalysts of the same species, heterogeneous noble metal catalysts have advantages in recovering and recycling of precious metals and high turnover number (TON), but drawbacks in product selectivity in a multi-product reaction [4,32]. The selectivity is highly important in the fine chemicals industries to yield a high portion of the desired products that simplifies the separation of products.…”

Section: Introductionmentioning

confidence: 99%

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Engineering Surface Ligands of Noble Metal Nanocatalysts in Tuning the Product Selectivity

Liu

Duay

et al. 2017

Catalysts

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Nanosized noble metal catalysts supported on high-surface-area support are of great importance for numerous industrial chemical processes to mediate reaction pathways in heterogeneous catalysis. Control of surface area and surface energy of nanocatalysts is a key to achieving high activity and selectivity for desired products. In the past decade, new synthetic methodologies for noble metal nanocatalysts with well-defined nanostructures have been developed. Wet-chemical preparation of noble metal nanocatalysts usually involves the utilization of specific surfactants that can bind the surface of nanocatalysts as ligands to control the nanostructures and prevent the coalescence of nanocatalysts. Surface ligands that form a densely packed self-assembled monolayer offer a facile solution to tune the surface energy of nanocatalysts, and, therefore, the selectivity of products. In this minireview, we highlight the recent advances in understanding the role of surface ligands in control over the product selectivity in a multi-product reaction using noble metal nanocatalysts. The review is outlined according to the three possible roles of surface ligands, including steric effect, orientation effect and surface charge state, in varying the adsorption/binding of reactants/transition states.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Engineering Surface Ligands of Noble Metal Nanocatalysts in Tuning the Product Selectivity

Liu

Duay

et al. 2017

Catalysts

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“…C=O bond stretching at 1448 and 901 cm -1 are evident in the sample, indicating some carbonate from SrCO 3 (Figure 5a). 14 The presence of water was confirmed by the technique, as well as for TG and X-ray methods. In the FTIR spectrum for the ferrite (Figure 5b) ) and a medium one (901 cm -1 ) characterize carbonyl from Sr(CO 3 ) 2 .…”

Section: Resultsmentioning

confidence: 91%

“…13 The increasing development of nanoscience field allows the application of nanotechnology to improve ferrites applications on situations it was not conceivable years ago, such as on nanocatalysis. 14 The application of easy-to-recover materials with surface-immobilized basic compounds is very pertinent to biodiesel production. Several studies have been made to add value to the modified agricultural obtained materials (i.e., vegetal oils) using chemical transformations in attempt to develop regional renewable products.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization and Catalytic Evaluation of Magnetically Recoverable SrO/CoFe2O4 Nanocatalyst for Biodiesel Production from Babassu Oil Transesterification

Falcão¹,

Garcia²,

Moura³

et al. 2017

J. Braz. Chem. Soc.

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Biodiesel production has gained a lot of attention due to its environmental benefits and production from renewable sources. Here, it is reported a magnetically recoverable catalyst of SrO immobilized on a CoFe 2 O 4 support (SrO/CoFe 2 O 4 ), which was efficiently applied for babassu oil transesterification and used up to four cycles without a significant activity loss. The stability and performance of the catalyst were analyzed considering the solvent used for its synthesis. Characterizations such as vibrating sample magnetometer (VSM), thermogravimetry (TG), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and energy dispersive spectroscopy (EDS) were performed. The present study demonstrated that the catalyst has a strong magnetic response, which reflects the nature of the nanoparticles. For the first run, the material presented a yield of 96% when synthesized in acetone in a molar proportion of SrO/CoFe 2 O 4 of 5:1.

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Functionalized Magnetic Mesoporous Silica Nanoparticle‐Supported Palladium Catalysts for Carbonylative Sonogashira Coupling Reactions of Aryl Iodides

Natour

Abu‐Reziq

2015

ChemCatChem

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Magnetic mesoporous silica nanoparticles (MMSN) were prepared and used as a support for palladium catalysts. MMSN with a surface area of 1909 m2 g−1 were synthesized by a nanoemulsification process involving the dispersion of hydrophobic magnetite nanoparticles in chloroform in the presence of cetyltrimethylammonium bromide, followed by the addition of tetraethoxysilane and its polycondensation by a sol–gel route. The MMSN were modified with phosphine and N‐heterocyclic carbene‐based ligands, which provided coordination sites for conjugation with a palladium catalyst. These modified particles were fully characterized and employed as catalyst nanosupports. The palladium catalyst was immobilized on the surface and within the pores of MMSN and applied in copper‐free carbonylative Sonogashira coupling reactions of aryl iodides with terminal alkynes.

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Concepts in Nanocatalysis

Cited by 49 publications

References 228 publications

Engineering Surface Ligands of Noble Metal Nanocatalysts in Tuning the Product Selectivity

Engineering Surface Ligands of Noble Metal Nanocatalysts in Tuning the Product Selectivity

Synthesis, Characterization and Catalytic Evaluation of Magnetically Recoverable SrO/CoFe2O4 Nanocatalyst for Biodiesel Production from Babassu Oil Transesterification

Functionalized Magnetic Mesoporous Silica Nanoparticle‐Supported Palladium Catalysts for Carbonylative Sonogashira Coupling Reactions of Aryl Iodides

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