Hydrogenation of olefins. Part 1.—Hydrogenation of ethylene, propylene and the n-butenes over alumina-supported platinum and iridium

Bond, G. C.; Phillipson, Jeremy; Wells, Peter B.; Winterbottom, J. M.

doi:10.1039/tf9646001847

Cited by 73 publications

(28 citation statements)

References 4 publications

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“…They found the same reaction orders with respect to ethylene (−0.60) and hydrogen (1.31) and a comparable activation barrier (10.8 kcal/mol) as reported for more complex catalysts [388,389]. Most importantly, the amount of carbon present on the surface after the reaction, estimated by AES to be ≈0.46 C atoms for each surface Pt atom, did not change significantly with reaction temperature and hydrogen partial pressure.…”

Section: Hydrogenation: a Structure-insensitive Reaction?supporting

confidence: 76%

Bridging the structure gap: Chemistry of nanostructured surfaces at well-defined defects

Vattuone

Savio

Rocca

2008

Surface Science Reports

120

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Section: Hydrogenation: a Structure-insensitive Reaction?supporting

confidence: 76%

Bridging the structure gap: Chemistry of nanostructured surfaces at well-defined defects

Vattuone

Savio

Rocca

2008

Surface Science Reports

120

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“…For instance, most of the reported activation energies lie between the values of 9 and 11 Kcal/ mole [11][12][13][14][15]. Bond and coworkers studied the reaction of ethylene with deuterium over different platinum catalysts, and reported reaction rate orders in hydrogen and ethylene partial pressures of 1.2 and -o.5, respectively [5,16). They also reported a deuterium distribution in the resulting ethane that qualitatively agrees with that obtained in our work.…”

Section: Discussionmentioning

confidence: 99%

Hydrogenation of ethylene over platinum (111) single-crystal surfaces

Zaera¹,

Somorjai²

1984

J. Am. Chem. Soc.

351

239

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“…20 −22 In particular, supported particles have been extensively employed (e.g., Ni/SiO 2 , 23 Ru/Al 2 O 3 , 24 Rh/Al 2 O 3 , 24 Pd/Al 2 O 3 , 15,24−26 Pd/ SiO 2 , 27,28 Ir/Al 2 O 3 , 12 Pt/MgO, 29 Pt/Al 2 O 3 , 12,24,29−33 Pt/SiO 2 , 23,29,34−40 Pt/(Al 2 O 3 , SiO 2 ), 29 and Pt/TiO 2 29 ).…”

Section: ■ Introductionmentioning

confidence: 99%

Comparative in Operando Studies in Heterogeneous Catalysis: Atomic and Electronic Structural Features in the Hydrogenation of Ethylene over Supported Pd and Pt Catalysts

Jung

Elsen

et al. 2015

ACS Catal.

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There exists an emerging opportunity, engendered by advances made in experimental methods of research, to address long-standing questions about the nature of the molecular mechanisms that are operative in important heterogeneous catalytic processes, as well as the nature of the complex atomic and electronic structural features that mediate them. Of particular interest in this regard is the understanding of the dynamical attributes of catalytic processesan understanding that might allow design principles to be applied to optimize the atomic and electronic structure of heterogeneous catalysts to sustain their performance in essentially any operating process condition. The current work explores these ideashighlighting capabilities of in operando methods of spectroscopic characterization as applied to an exemplary heterogeneous catalytic process, olefin hydrogenation. No heterogeneous catalytic process has been studied more intensively than olefin hydrogenation. The extensive literature available establishes important features by which metal catalysts activate and efficiently transform the bonding of the hydrogen and alkene reactants to generate a product alkane. Even so, many important mechanistic questions remain poorly understood due to the inherent multiscale complexity associated with heterogeneous catalytic transformations, as well as the paucity of methods suitable for their characterization in operando. The recent literature documents the development of new capabilities for characterization afforded by in situ and in operando methods. Of these, X-ray absorption spectroscopy (XAS) has become a particularly important technique for studying the mechanisms of catalytic reactions due to its capabilities for elucidating the nature of the atomic and electronic structural features of operating catalysts. Many important questions can now be addressed, in particular those that follow from the unique dynamical impacts and patterns of reactivity that occur in higher pressure (non-UHV) environments. In this Perspective, we examine important structure−property correlations for an exemplary model reactionethylene hydrogenationas elucidated in operando for two efficient catalyst materialsnanoscale Pd and Pt clusters supported on SiO 2 . The examined features include the following: the structural dynamics of the metal clusters and their sensitivity to the composition of the reactant feed; the role of hydrogen, and metal-and/ or support-bonded forms of adsorbates more generally, in forming intermediates and products; the influences of adsorbate bonding states (e.g., hydrogen) on reactivity; the role played by carbonaceous deposits (and the mechanisms of their formation); the quantitative nature of the atomistic features that exist within the structure−sensitivity correlations of this catalytic reaction; and mechanisms that mediate the sintering of catalysts operating in high-pressure ambient environment. Here we present a comparative overview of the hydrogenation of ethylene over ≈1 nm-sized Pd and Pt catalysts supported ...

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Hydrogenation of olefins. Part 1.—Hydrogenation of ethylene, propylene and the n-butenes over alumina-supported platinum and iridium

Cited by 73 publications

References 4 publications

Bridging the structure gap: Chemistry of nanostructured surfaces at well-defined defects

Bridging the structure gap: Chemistry of nanostructured surfaces at well-defined defects

Hydrogenation of ethylene over platinum (111) single-crystal surfaces

Comparative in Operando Studies in Heterogeneous Catalysis: Atomic and Electronic Structural Features in the Hydrogenation of Ethylene over Supported Pd and Pt Catalysts

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