The liquid-phase hydrogenation of phenyl acetylene and styrene on a palladium/carbon catalyst

Jackson, S. David; Shaw, Lindsay Alexander

doi:10.1016/0926-860x(95)00194-8

Cited by 91 publications

(54 citation statements)

References 14 publications

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“…If internal mass-transfer limits a reaction, it is commonly known that the observed activation energy is half the true activation energy [8]. Comparing the observed activation energy of 26 kJ/mol by Jackson and Shaw [7] to that of 52 kJ/mol reported by Chaudhari et al [6] leads to the conclusion that the lower value must have been an internally mass-transfer limited one. In the current work the experiments similarly point to the conclusion that mass-transfer inside the catalyst particles is important.…”

Section: Reaction Kineticsmentioning

confidence: 74%

“…One such example is the hydrogenation of phenylacetylene over palladium [6], for which normal L-H kinetics suffice without having to include mass-transfer into the modeling. For this same reaction Jackson and Shaw [7] do not report any mass-transfer effects either. However, they report an activation energy of only 26 kJ/mol, which is very low and unlikely.…”

Section: Reaction Kineticsmentioning

confidence: 88%

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Separation of kinetics and mass-transport effects for a fast reaction: the selective hydrogenation of functionalized alkynes

et al. 2003

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A kinetic study has been made into the hydrogenation of 3-methyl-1-pentyn-3-ol over palladium on silica catalysts. This reaction already proceeds at very high rates under mild reaction conditions and, therefore, mass-transfer inside the catalyst particle inevitably influences the reaction progress, making the determination of the reaction kinetics difficult. To be able to determine the reaction mechanism and the kinetic parameters, a model has been drawn up in which both mass-transfer and kinetics are modeled simultaneously. This model is able to accurately describe the reaction progress. The model can also be used to explain the effect of commonly used reaction modifiers like quinoline on the reaction. Quinoline can be added to increase the selectivity to the desired alkene intermediate. From the calculations it is shown that the primary function of this type of modifier is to decrease the reaction rate. The lower reaction rate and thereby relatively smaller mass-transfer resistance in the catalyst is most likely a primary cause for the increased selectivity when a reaction modifier is used.

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Section: Reaction Kineticsmentioning

confidence: 74%

Section: Reaction Kineticsmentioning

confidence: 88%

Separation of kinetics and mass-transport effects for a fast reaction: the selective hydrogenation of functionalized alkynes

et al. 2003

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“…Most studies in recent years about hydrogenation of alkynes have focused on the use of supported palladium catalysts. Pd on SiO2, [1][2][3] Pd on Al2O3, [4][5][6][7] Pd on Carbon, [8][9][10] Pd on pumice, 11,12 Pd on CeO 2 13 and palladium supported on mesoporous montmorrilonite clay 14,15 and microporous zeolite materials 16 were applied. Much effort has been made to empirical modifications of such palladium based catalysts to improve the desired selectivity.…”

Section: Introductionmentioning

confidence: 99%

Palladium Nanoparticles Suspended in an Ionic Liquid as Reusable Catalyst for Alkyne Semihydrogenation

Lee¹,

Kim²,

Cheong³

et al. 2010

Bulletin of the Korean Chemical Society

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The reaction of PdCl2 dispersed in tetra-n-butylammonium bromide with tributyl amine at 120 o C under argon leads to stable isolable nanometric particles. X-ray diffraction analysis of the material indicated that it is constituted of Pd(0). Transmission electron microscopy analysis of the particles dispersed in acetone shows the mean particle size distribution (4 ± 1 nm). The isolated palladium nanoparticles can be dispersed in an ionic liquid or in methanol or used in solventless condition for selective hydrogenation of 2-hexyne under mild reaction conditions(0.2 MPa and 20 o C). The commercial variety of the Lindlar catalyst was also studied for comparative investigations.

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“…Ali (2012) also assumed first order with respect to styrene and estimated as 0.1 the order of reaction for hydrogen, and Tukac et al (2007) estimated order 1 for hydrogen and 0.5 for styrene. Jackson and Shaw (1996) found a completely different result for styrene hydrogenation over a Pd/carbon catalyst: assuming zero order for hydrogen, they estimated also zero order for styrene. This result might indicate that Langmuir-Hinshelwood models could be a good representation for the reaction rate.…”

Section: Introductionmentioning

confidence: 99%

Modeling Styrene Hydrogenation Kinetics Using Palladium Catalysts

Justino

Vale

Silva

et al. 2016

Braz. J. Chem. Eng.

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-The high octane number of pyrolysis gasoline (PYGAS) explains its insertion in the gasoline pool. However, its use is troublesome due to the presence of gum-forming chemicals which, in turn, can be removed via hydrogenation. The use of Langmuir-Hinshelwood kinetic models was evaluated for hydrogenation of styrene, a typical gum monomer, using Pd/9%Nb2O5-Al2O3 as catalyst. Kinetic models accounting for hydrogen dissociative and non-dissociative adsorption were considered. The availability of one or two kinds of catalytic sites was analyzed. Experiments were carried out in a semi-batch reactor at constant temperature and pressure in the absence of transport limitations. The conditions used in each experiment varied between 16 -56 bar and 60 -100 ºC for pressure and temperature, respectively. The kinetic models were evaluated using MATLAB and EMSO software. Models using adsorption of hydrogen and organic molecules on the same type of site fitted the data best.

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The liquid-phase hydrogenation of phenyl acetylene and styrene on a palladium/carbon catalyst

Cited by 91 publications

References 14 publications

Separation of kinetics and mass-transport effects for a fast reaction: the selective hydrogenation of functionalized alkynes

Separation of kinetics and mass-transport effects for a fast reaction: the selective hydrogenation of functionalized alkynes

Palladium Nanoparticles Suspended in an Ionic Liquid as Reusable Catalyst for Alkyne Semihydrogenation

Modeling Styrene Hydrogenation Kinetics Using Palladium Catalysts

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