Activity and stability of ion-exchange resin-supported tetrakis(triethyl phosphite)nickel hydride catalyst: Vapor phase isomerization of n-butene

Raje, Ajoy; Datta, Ravindra

doi:10.1016/0304-5102(92)80034-e

Cited by 11 publications

(9 citation statements)

References 29 publications

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“…Because both [{(EtO) 3 P} 3 NiH] + and free (EtO) 3 P are unstable under the acidic medium, decomposition of the catalyst is a major concern. A successful strategy to improve catalyst stability (and catalytic performance) is through the immobilization of the nickel hydride on an ion-exchange resin, Amberlyst-15 …”

Section: Catalytic Reactionsmentioning

confidence: 88%

“…A successful strategy to improve catalyst stability (and catalytic performance) is through the immobilization of the nickel hydride on an ion-exchange resin, Amberlyst-15. 268 Nickel hydride complexes bearing a labile chelating ligand may provide the needed vacant coordination site through ligand dissociation, thus serving as efficient catalysts for the isomerization of alkenes. Complex [(Ph 2 PCH 2 CH 2 SEt) 2 NiH]-(BPh 4 ) is a good example as the thioether moiety is expected to dissociate readily from nickel.…”

Section: Isomerization Of Alkenesmentioning

confidence: 99%

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Nickel Hydride Complexes

2016

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Nickel hydride complexes, defined herein as any molecules bearing a nickel hydrogen bond, are crucial intermediates in numerous nickel-catalyzed reactions. Some of them are also synthetic models of nickel-containing enzymes such as [NiFe]-hydrogenase. The overall objective of this review is to provide a comprehensive overview of this specific type of hydride complexes, which has been studied extensively in recent years. This review begins with the significance and a very brief history of nickel hydride complexes, followed by various methods and spectroscopic or crystallographic tools used to synthesize and characterize these complexes. Also discussed are stoichiometric reactions involving nickel hydride complexes and how some of these reactions are developed into catalytic processes.

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Section: Catalytic Reactionsmentioning

confidence: 88%

Section: Isomerization Of Alkenesmentioning

confidence: 99%

Nickel Hydride Complexes

2016

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“…The vapor-phase isomerization of 1-butene was also described with an Amberlyst 15 resin that was partially exchanged by the cationic hydrido complex {H−NiP(OEt) 3 } 4+ . This ionically heterogeneous catalyst was better than its homogeneous counterpart, in terms of catalytic activity and stability …”

Section: Alkylation Isomerization and Oligomerization Of Alkenesmentioning

confidence: 95%

“…This ionically heterogeneous catalyst was better than its homogeneous counterpart, in terms of catalytic activity and stability. 65 The metathesis of oct-1-ene to give tetradecene was performed with a supported metal carbene species, which was derived from tungsten; here, an anionic complex, ClW(CO) 5 -, which was derived from W(CO) 6 , was first attached to a strong anion-exchange resin and then reduced with EtAlCl 2 to give the carbenoid catalytic species. 66…”

Section: Alkylation Isomerization and Oligomerization Of Alkenesmentioning

confidence: 99%

Organic Synthesis by Catalysis with Ion-Exchange Resins

Gelbard

2005

Ind. Eng. Chem. Res.

180

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This review is intended to give a wide scope on the uses of ion-exchange resins as catalysts or catalyst precursors in organic synthesis, for the preparation of fine or intermediate chemicals. Twelve families of reaction have been covered and presented according to the molecules to be synthesized, regardless of the anionic or cationic nature of the resins; thus, ∼300 references have been selected from January 1980. In acid-catalyzed reactions, the contribution of both Lewis acidity and Bro ¨nsted acidity are mentioned, and, when available, some aspects related to the stability or the recycling of the catalysts are reported. In base-catalyzed reactions, the importance of the thermal stability of anionic resins has been underlined. A table that is included as an appendix provides some data on the resins quoted here.

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“…As a result, there have been numerous attempts to "heterogenize" the liquid phase catalysts [5], so that the resulting catalysts would have the advantages of both homogeneous and heterogeneous catalysts, namely, high activity and selectivity, ease of separation, and noncorrosive environment. The various techniques investigated include ligand attachment to the support either via a covalent [6] or ionic bond [7], supported liquid-phase catalysis (SLPC) [8][9][10][11][12], supported aqueous-phase catalysis (SAPC) [13,14], supported molten-salt catalysis (SMSC) [15,16], and supported ionic liquid catalysis (SILC) [17], wherein nano-films of high-boiling organic or aqueous solvent, or molten salt or room temperature ionic liquid, are coated on the walls of porous support. Most of these techniques, based on the original idea of Rony [8], show growing promise, although they each have their limitations as well, especially in terms of stability when the supported liquid has significant volatility or solubility in the reacting phase.…”

Section: Introductionmentioning

confidence: 99%

Supported Molten Metal Catalysis. A New Class of Catalysts

Datta¹,

Singh²,

Serban³

et al. 2006

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We describe a new class of heterogeneous catalysts called supported molten metal catalysis (SMMC), in which molten metal catalysts are dispersed as nanodroplets on the surface of porous supports, allowing much larger active surface area than is possible in conventional contacting techniques for catalytic metals that are molten under reaction conditions, thus greatly enhancing their activity and potential utility. Specific examples of different types of reactions are provided to demonstrate the broad applicability of the technique in designing active, selective, and stable new catalysts. It is shown that dispersing the molten metal on a support in the suggested manner can enhance the rate of a reaction by three to four orders of magnitude as a result of the concomitant increase in the active surface area. New reaction examples include γ-Al 2 O 3 supported molten Te (melting point 450 ºC) and Ga (MP 30 ºC) catalysts for bifunctional methylcyclohexane dehydrogenation. These catalysts provide activity similar to conventional Pt-based catalysts for this with better resistance to coking. In addition, results are described for a controlled pore glass supported molten In (MP 157 ºC) catalyst for the selective catalytic reduction of NO with ethanol in the presence of water, demonstrating activities superior to conventional catalysts for this reaction. A discussion is also provided on the characterization of the active surface area and dispersion of these novel supported catalysts. It is clear based on the results described that the development of new active and selective supported molten metal catalysts for practical applications is entirely plausible.

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Activity and stability of ion-exchange resin-supported tetrakis(triethyl phosphite)nickel hydride catalyst: Vapor phase isomerization of n-butene

Cited by 11 publications

References 29 publications

Nickel Hydride Complexes

Nickel Hydride Complexes

Organic Synthesis by Catalysis with Ion-Exchange Resins

Supported Molten Metal Catalysis. A New Class of Catalysts

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