A nickel tetra-coordinated complex as catalyst in heterogeneous hydrogenation

L’Argentière, Pablo C.; Cagnola, Edgardo; Cañón, María G.; Liprandi, Domingo; Marconetti, Delia V.

doi:10.1002/(sici)1097-4660(199804)71:4<285::aid-jctb854>3.0.co;2-h

Cited by 10 publications

(7 citation statements)

References 6 publications

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“…It is well known that silicon and sulfur are two possible contaminants of polystyrene. When polystyrene is used as a catalytic support of complex species, sulfur can also act as a poison because it may substitute some ligands, generating less‐active catalytic species 4–8. Although it is possible to regenerate, within certain limits, a poisoned complex catalyst,6 it is desirable to ensure that the support is free from this contaminant.…”

Section: Resultsmentioning

confidence: 99%

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PdCl2 anchorage onto the surface of polystyrene films via oxygen and ammonia plasma treatment

L’Argentière

Taher

2000

J. Chem. Technol. Biotechnol.

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The surface properties of polystyrene as a possible catalytic support for active coordinative species were investigated. To improve the surface properties, discharge treatments in the presence of oxygen and ammonia were carried out. The polymer surface was studied before and after the plasma treatments. Contact angles for the polymer surface were measured in order to determine the surface free energy. Polymer‐bound complex catalysts were prepared by anchoring PdCl2 on the surface of the polystyrene samples. The chemical compositions were studied by X‐ray Photoelectron Spectroscopy (XPS). Plasma treatments in the presence of oxygen or ammonia caused an increase in the surface free energy of polystyrene, as a consequence of the higher concentration of oxygenated or nitrogenated functional groups, respectively, on the polymer surface. Contact angle measurements are in agreement with the corresponding values obtained by XPS. After treatment with PdCl2, the amount of palladium anchored to the polymer surface treated with ammonia is greater than in the case of the oxygen plasma treatments; this may be explained on the basis of the higher nucleophilic character of the amine groups. No palladium was detected in the untreated polystyrene surface. © 2000 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 99%

“…Considerable higher activity, selectivity and sulfur‐resistance levels may be obtained by using these catalysts rather than traditional ones. In addition, complex catalysts may be operated under milder conditions 5–8…”

Section: Introductionmentioning

confidence: 99%

PdCl2 anchorage onto the surface of polystyrene films via oxygen and ammonia plasma treatment

L’Argentière

Taher

2000

J. Chem. Technol. Biotechnol.

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“…Catalytic homogeneous hydrogenation of cyclohexene has been claimed for simple systems such as nickel(II) acetylacetonate [39] or a nickel-chloride complex with two monodentate amines [40]. The latter complex was used as comparison for a heterogeneous catalyst obtained by impregnation of the complex on c-alumina [40].…”

Section: Nickel Complexes Of Oxygen-or Nitrogen-containing Ligandsmentioning

confidence: 99%

Nickel

Bouwman¹

2006

The Handbook of Homogeneous Hydrogenation

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Nickelneous hydrogenation reaction. In this section, a brief overview will be provided of mononuclear nickel complexes, which have been reported to catalyze homogeneously the hydrogenation of various olefins. Many of the reported nickel-containing hydrogenation catalysts are of the Ziegler type (i.e., a nickel salt in combination with a reducing agent such as trialkylaluminum), and in many cases it is questionable whether the reported complexes yield really homogeneous hydrogenation catalysts or that the observed catalytic hydrogenation activity is due to formation of colloidal (heterogeneous) nickel particles [5]. Coordination Chemistry and Organometallic Aspects of Nickel Nickel-Hydride Complexes Nickel 94Scheme 5.1 Different modes of dihydrogen activation. (a) Oxidative addition, forming a metal dihydride species; (b) homolytic activation, forming two metal monohydride species; (c) heterolytic splitting, forming a metal hydride species and a proton.

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“…These coordination compounds, used as catalysts, have gained increasing importance for such reactions [22][23][24][25][26][27][28] because they allow getting higher activities and selectivities, even under mild conditions of temperature and pressure [29][30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%