The Addition of Hydrogen to Multiple Carbon-Carbon Bonds.

Campbell, Kenneth N.; Campbell, Barbara K.

doi:10.1021/cr60098a003

Cited by 64 publications

(13 citation statements)

References 127 publications

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“…Various catalysts e.g. Raney-nickel [4] , so called "amorphous Ni-B alloys" [5] or Fe based [6,7] catalysts are reported to show good catalytic properties for the liquid phase alkyne hydrogenation but generally require harsh conditions, i.e. high temperature and pressure.…”

Section: Introductionmentioning

confidence: 99%

Surface dynamics of the intermetallic catalyst Pd2Ga, Part II – Reactivity and stability in liquid-phase hydrogenation of phenylacetylene

Wowsnick

Teschner

Armbrüster

et al. 2014

Journal of Catalysis

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The catalytic properties of unsupported Pd 2 Ga for the liquid phase hydrogenation of phenylacetylene are investigated after different pre-treatments with focus on the stability of the catalyst during reaction. The surface of as prepared Pd 2 Ga consists mainly on Pd and oxidized Ga species. Under the conditions of the liquid phase hydrogenation of phenylacetylene the intermetallic surface cannot be reformed in situ by reduction of Ga oxide. After a reductive pre-treatment in 5% H 2 /Ar at 400 °C, an almost clean Pd 2 Ga surface can be obtained. Its hydrogenation activity is significantly lowered compared to elemental Pd, which is due to the intrinsic adsorption properties of the intermetallic surface. However, residues of H 2 O or O 2 lead to oxidation of this surface. Excluding these impurities the decomposition can be suppressed. In this case, the bulk material of Pd 2 Ga gets cracked by phenylacetylene during reaction. The controlled modification of the crystal and the electronic structure of Pd by formation of the intermetallic compound Pd 2 Ga is accompanied with a decreased stability.

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Section: Introductionmentioning

confidence: 99%

Surface dynamics of the intermetallic catalyst Pd2Ga, Part II – Reactivity and stability in liquid-phase hydrogenation of phenylacetylene

Wowsnick

Teschner

Armbrüster

et al. 2014

Journal of Catalysis

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“…On the other hand, this has a very positive effect on the rate of surface reaction. The relation found in between adsorptivity of cis-and trans-1,3-pentadiene corresponds to the generally stronger adsorption of cis-isomers of unsaturated compounds on the surface of platinum metals, as compared to trans-isomers [3,8,9]. What is interesting is the finding that non-conjugated 1,4-pentadiene is adsorbed on the Pd catalyst surface more strongly than conjugated dienes: 1,3-cyclopentadiene and trans-1,3-pentadiene.…”

Section: Competitive Hydrogenations In Binary Systemsmentioning

confidence: 93%

Competitive hydrogenation in binary diene systems on a palladium catalyst

Krupka

Severa

Pašek

2006

React Kinet Catal Lett

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Hydrogenations of individual C 5 dienic substrates (1,3-cyclopentadiene, isoprene, 1,4-pentadiene, cis-1,3-pentadiene, trans-1,3-pentadiene) and their binary mixtures on a heterogeneous palladium catalyst were studied in cyclohexane at 25°C and 2 MPa. Selectivities of the competitive hydrogenations were determined and the substrates relative adsorption coefficients calculated. Effects of the diene structure on their reactivity and the stability of the surface complex are discussed. It was found that differences in selectivity of the competitive hydrogenations of C 5 dienes are caused by the difference both in adsorptivity values and in reactivity of adsorbed molecules. The presence of a five-membered ring in the C 5 dienes leads to significant reduction of surface complex stability as compared with acyclic structures of C 5 dienes. On the other hand, it has a very positive effect on the rate of surface reaction.

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“…The literature has described a number of synthetic methods [11,17] that led to the production of complexes of the type (olefin)Pt(PPh 3 ) 2 . There are few basic procedures for the synthesis of these organometals.…”

Section: Synthetic Procedures Of (Olefin)pt(pph 3 ) 2 Complexmentioning

confidence: 99%

Organometallics: Exploration Tool for Surface Phenomena in Heterogeneous Catalysis

Kindl¹,

Matuška²,

Kačer³

2017

New Advances in Hydrogenation Processes - Fundamentals and Applications

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Homogeneous and heterogeneous catalyses have sufficient common features that are based on the same molecular phenomena, thus permitting them and their benefits to be directed to the same objective. Moreover, conditions that apply to one of them can yield benefits to the other. In this chapter, the progress of combining these advantages is demonstrated on a particular topic of testing a suitable structural model from the field of organometallic compounds, whose structure resembles complexes adsorbed on the surface of heterogeneous catalysts. The adsorbed complexes represent key structures in the conversion of reactants to products, while their demanding structural characterization is one of the main persistent topics of heterogeneously catalyzed reactions. These include compounds procuring a precious mechanistic interpretation of such complex concepts as the catalytic activity and selectivity. The knowledge of the structure of an adsorbed complex leads to a better understanding of the complex surface processes and more precisely defined heterogeneous catalysts. The understanding of processes on the molecular level allows discussing the structure-activity. Analogies and differences between molecular (homogeneous catalysis) and surface (heterogeneous catalysis) chemistry are addressed in this review. The work demonstrates that these two fields are complementary, presenting a large potential for the development of novel and superior catalysts when the advantages of both sub-disciplines are combined.

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The Addition of Hydrogen to Multiple Carbon-Carbon Bonds.

Cited by 64 publications

References 127 publications

Surface dynamics of the intermetallic catalyst Pd2Ga, Part II – Reactivity and stability in liquid-phase hydrogenation of phenylacetylene

Surface dynamics of the intermetallic catalyst Pd2Ga, Part II – Reactivity and stability in liquid-phase hydrogenation of phenylacetylene

Competitive hydrogenation in binary diene systems on a palladium catalyst

Organometallics: Exploration Tool for Surface Phenomena in Heterogeneous Catalysis

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