Catalytic hydrogenation of 1,3-butadiene on Pd particles evaporated on carbonaceous supports: Particle size effect

Tardy, B.; Noupa, C.; Leclercq, C.; Bertolini, J.C.; Hoareau, A.; Treilleux, M.; Fauré, J.; Nihoul, G.

doi:10.1016/0021-9517(91)90002-l

Cited by 98 publications

(20 citation statements)

References 14 publications

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“…This effect is ascribed to the necessity of large ensemble of Pd surface atoms to form a hydrogenation active centre, i.e., there are more active centres on the larger nanoparticles [58]. Similar results were reported in other works [61,62]. On the other hand, Anderson et al demonstrated that nanoparticles of higher dispersion have higher activity [60].…”

Section: Liquid Phase Hydrogenationsupporting

confidence: 75%

“…Therefore novel modifications are needed, which not only increase reaction selectivity, but provide for easier separation from the products. Many nitrogen and sulphur-containing polymers show exceptional selectivity at high activity [27,62,63]. It is likely that these modifiers combine active site poisoning, electronic and thermodynamic effects, although the mechanistic details are not clear.…”

Section: Reversible Adsorbatesmentioning

confidence: 99%

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The Reduction of Alkynes Over Pd-Based Catalyst Materials - A Pathway to Chemical Synthesis

Ao¹,

Sk²

2017

J Chem Eng Process Technol

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Many reactions, including selective hydrogenation of alkynes, take place on solid surfaces. These reactions are vital in many areas of industry including the manufacture of polymers and fine chemicals such as vitamins, fragrances, and drugs. The choice of a catalyst is a trade-off between activity, selectivity and costs. Palladium-based heterogeneous catalysts are traditionally used for these processes as they provide the activation of hydrogen at room temperatures and offers reasonable selectivity, but these catalysts have a number of practical drawbacks. This review discusses recent research work in the selective hydrogenation of alkynes on palladium-based catalysts, emphasises the mechanism and catalytic materials and important applications including alkyne removal from gasphase alkene precursors for polymer synthesis and liquid phase selective hydrogenation for the synthesis of fine chemicals. Langmuir-Hinshelwood reaction kinetic models, reaction intermediates, formation of carbonaceous layer, the nature of active sites and the effects of reversible and irreversible adsorbates over Pd surface are discussed as well as the factors affecting catalyst activity and selectivity and how these can be optimised in synthetic protocols for these reactions.

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Section: Liquid Phase Hydrogenationsupporting

confidence: 75%

Section: Reversible Adsorbatesmentioning

confidence: 99%

The Reduction of Alkynes Over Pd-Based Catalyst Materials - A Pathway to Chemical Synthesis

Ao¹,

Sk²

2017

J Chem Eng Process Technol

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“…For example, the conversion efficiency and selectivity of alkynes to alkenes, conjugated alkenes to monoalkenes, and hydrogenation of alkenes are all strongly dependent on the size of Pd nanocrystals [22][23][24][25][26], in particular, in the sub-10 nm regime. On the other hand, it has been demonstrated that the facets on the surface of Pd nanocrystals can have a strong influence on catalytic properties.…”

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confidence: 99%

Synthesis of Pd nanocrystals enclosed by {100} facets and with sizes <10 nm for application in CO oxidation

et al. 2010

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The catalytic activity of noble-metal nanocrystals is mainly determined by their sizes and the facets exposed on the surface. For single crystals, it has been demonstrated that the Pd(100) surface is catalytically more active than both Pd(110) and Pd(111) surfaces for the CO oxidation reaction. Here we report the synthesis of Pd nanocrystals enclosed by {100} facets with controllable sizes in the range of 6-18 nm by manipulating the rate of reduction of the precursor. UV-vis spectroscopy studies indicate that the rate of reduction of Na 2 PdCl 4 can be controlled by adjusting the concentrations of Br -and Cl -ions added to the reaction mixture. Pd nanocrystals with different sizes were immobilized on ZnO nanowires and evaluated as catalysts for CO oxidation. We found that the activity of this catalytic system for CO oxidation showed a strong dependence on the nanocrystal size. When the size of the Pd nanocrystals was reduced from 18 nm to 6 nm, the maximum conversion rate was significantly enhanced by a factor of ~10 and the corresponding maximum conversion temperature was lowered by ~80 °C . KEYWORDS

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“…People often use electron microscopy to study the sintering of supported catalytic metal particles [1]. This study necessitates the identification of the particles to be analysed from their electron micrograph, thus we have proposed an image segmentation alogorithm based on the nucleation and growth of the background [2].…”

mentioning

confidence: 99%

“…The same automated method has been used to segment the large transmission electron micrograph shown in figure 6. The figure contains many more particles than figures [1][2][3][4][5], and the contrast varies from particles to particle. The segmentation results (Fig.…”

mentioning

confidence: 99%

Automated segmentation algorithm for electron microscope images with strong grey level fluctuations

Zheng

Kolb

1994

Microsc. Microanal. Microstruct.

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Catalytic hydrogenation of 1,3-butadiene on Pd particles evaporated on carbonaceous supports: Particle size effect

Cited by 98 publications

References 14 publications

The Reduction of Alkynes Over Pd-Based Catalyst Materials - A Pathway to Chemical Synthesis

The Reduction of Alkynes Over Pd-Based Catalyst Materials - A Pathway to Chemical Synthesis

Synthesis of Pd nanocrystals enclosed by {100} facets and with sizes <10 nm for application in CO oxidation

Automated segmentation algorithm for electron microscope images with strong grey level fluctuations

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