Propyne hydrogenation over alumina-supported palladium and platinum catalysts

Kennedy, D.R.; Webb, G.; Jackson, S. David; Lennon, David

doi:10.1016/j.apcata.2003.09.018

Cited by 74 publications

(81 citation statements)

References 59 publications

(97 reference statements)

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“…Figure 3 shows the reaction to be complete at around 75 min, with the reaction ultimately returning a complete mass balance. An initial mass imbalance is observed that is in excess of the number of Pd sites, as determined by the CO adsorption isotherm (missing mass : Pd(s) at 10 mins = 88 : 1), therefore it is assumed that this quantity of reagent is retained by the carbon support [31]. The mass balance is recovered following the completion of reaction indicating desorption of organic material from the catalyst.…”

Section: The Hydrogenation Of Benzonitrile (C 6 H 5 Cn)mentioning

confidence: 99%

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The application of a supported palladium catalyst for the hydrogenation of aromatic nitriles

McMillan

Gilpin

Baker

et al. 2016

Journal of Molecular Catalysis A: Chemical

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Section: The Hydrogenation Of Benzonitrile (C 6 H 5 Cn)mentioning

confidence: 99%

“…Thus, in the case of benzonitrile hydrogenation at least, this pathway is thought to be the origin of the low mass balance in the initial stages of that reaction. Thereafter, reverse spillover occurs [31].…”

Section: The Co-adsorption Of Benzonitrile (C 6 H 5 Cn) and Benzylamimentioning

confidence: 99%

The application of a supported palladium catalyst for the hydrogenation of aromatic nitriles

McMillan

Gilpin

Baker

et al. 2016

Journal of Molecular Catalysis A: Chemical

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“…The reaction mechanism for alkyne semihydrogenation over the Pd-based catalysts is well established to take place between the adsorbed alkyne species and dissociatively adsorbed hydrogen over the Pd nanoparticles [53][54][55]. The ZnO support, in contrast to traditional supports, such as carbon or refractory oxides (SiO2, Al2O3, or TiO2), forms Pd-Zn intermetallic compounds, which affect the relative adsorption energies of alkynes and alkenes and result in an increased alkene selectivity [51,56].…”

Section: Effect Of Liquid Flow Ratesmentioning

confidence: 99%

Process Intensification of Alkynol Semihydrogenation in a Tube Reactor Coated with a Pd/ZnO Catalyst

2017

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Semihydrogenation of 2-methyl-3-butyn-2-ol (MBY) was studied in a 5 m tube reactor wall-coated with a 5 wt % Pd/ZnO catalyst. The system allowed for the excellent selectivity towards the intermediate alkene of 97.8 ± 0.2% at an ambient H 2 pressure and a MBY conversion below 90%. The maximum alkene yield reached 94.6% under solvent-free conditions and 96.0% in a 30 vol % MBY aqueous solution. The reactor stability was studied for 80 h on stream with a deactivation rate of only 0.07% per hour. Such a low deactivation rate provides a continuous operation of one month with only a two-fold decrease in catalyst activity and a metal leaching below 1 parts per billion (ppb). The excellent turn-over numbers (TON) of above 10 5 illustrates a very efficient utilisation of the noble metal inside catalyst-coated tube reactors. When compared to batch operation at 70 • C, the reaction rate in flow reactor can be increased by eight times at a higher reaction temperature, keeping the same product decomposition of about 1% in both cases.

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“…One way this is achieved is to define structure/activity relationships for specified reactions [1,2] Supported palladium catalysts are widely used in selective hydrogenation reactions [3][4][5], thus it is desirable to correlate product yields with catalyst performance, so as to optimize catalyst productivity.…”

Section: Introductionmentioning

confidence: 99%

Structural and spectroscopic characterisation of C4 oxygenates relevant to structure/activity relationships of the hydrogenation of α,β-unsaturated carbonyls

Parker

Silverwood

Hamilton

et al. 2016

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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Supported palladium catalysts are widely used in selective hydrogenation reactions, thus it is desirable to correlate product yields with catalyst performance, so as to optimize catalyst productivity. One method to achieve this goal is to use gas phase infrared spectroscopy to follow the evolution of the gas phase composition as a catalytic reaction progresses and hence determine the kinetics of the reaction. The method is critically dependent on reliable identification and assignment of the modes of each of the species that may be present. We plan to use the same method to investigate how the morphology of Pd crystallites can influence selectivity branching in gas phase hydrogenation reactions of α,β-unsaturated carbonyl compounds, specifically by following the hydrogenation of 3-butyne-2-one to 3-butene-2-one to 2-butanone and finally to 2-butanol. In the present work, we have investigated the conformational isomerism and calculated the vibrational spectra of the C4 oxygenates using density functional theory. The calculations are validated by comparison to the inelastic neutron scattering and infrared spectra of the compounds. KeywordsInelastic neutron scattering spectroscopy; Infrared spectroscopy; Density functional theory; Conformational isomerism Highlights• The conformational isomerism in 3-butyne-2-one, 3-butene-2-one, 2-butanone and 2-butanol oxygenates has been investigated.• Complete vibrational assignments for 3-butyne-2-one, 3-butene-2-one, 2-butanone and 2-butanol are obtained from density functional theory.• The assignments have been tested by comparison to inelastic neutron scattering spectra. Graphical abstract3

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Propyne hydrogenation over alumina-supported palladium and platinum catalysts

Cited by 74 publications

References 59 publications

The application of a supported palladium catalyst for the hydrogenation of aromatic nitriles

The application of a supported palladium catalyst for the hydrogenation of aromatic nitriles

Process Intensification of Alkynol Semihydrogenation in a Tube Reactor Coated with a Pd/ZnO Catalyst

Structural and spectroscopic characterisation of C4 oxygenates relevant to structure/activity relationships of the hydrogenation of α,β-unsaturated carbonyls

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