Palladium-catalyzed liquid-phase hydrogenation/hydrogenolysis of disulfides

Novakova, Ekaterina K.; McLaughlin, Leanne; Burch, Robbie; Crawford, Paul; Griffin, Ken; Hardacre, Christopher; Hu, P.; Rooney, David

doi:10.1016/j.jcat.2007.04.002

Cited by 24 publications

(18 citation statements)

References 31 publications

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“…Crystalline phases and chemical states of Pd-A catalysts were examined by XRD (X-ray diffraction) and 27 Al MAS NMR (magic angle spinning nuclear magnetic resonance) measurements. XRD patterns of Pd-A catalysts were obtained with a Rigaku D-Max2500-PC instrument using Cu-Ka radiation (k = 1.541 Å ) operated at 50 kV and 100 mA.…”

Section: Characterizationmentioning

confidence: 99%

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Hydrogenation of Succinic Acid to γ-Butyrolactone (GBL) Over Palladium-Alumina Composite Catalyst Prepared by a Single-Step Sol–Gel Method

et al. 2010

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Mesoporous palladium-alumina (Pd-A) composite catalysts prepared by a single-step sol-gel method were calcined at various temperatures to control palladium surface area and acidity. The Pd-A catalysts were characterized by XRD, BET, N 2 adsorption-desorption isotherm, H 2 chemisorption, 27 Al MAS NMR, NH 3 -TPD, and HR-TEM analyses. Liquid-phase hydrogenation of succinic acid to c-butyrolactone (GBL) was carried out over Pd-A catalyst in a batch reactor. The effect of calcination temperature of Pd-A catalyst on the palladium surface area and catalytic performance was investigated. In the hydrogenation of succinic acid, conversion of succinic acid increased with increasing palladium surface area of Pd-A catalyst. Selectivity for GBL depended on the formation of succinic anhydride (an intermediate product formed by acid catalysis) and by-products (formed by hydrogenolysis). Nevertheless, yield for GBL also increased with increasing palladium surface area of Pd-A catalyst. Thus, palladium surface area played an important role in enhancing the catalytic performance of Pd-A catalyst in the hydrogenation of succinic acid to GBL.

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Section: Characterizationmentioning

confidence: 99%

“…The Pd-A catalysts were characterized by XRD, BET, N 2 adsorption-desorption isotherm, H 2 chemisorption, 27 Al MAS NMR, NH 3 -TPD, and HR-TEM analyses. Liquid-phase hydrogenation of succinic acid to GBL was carried out over Pd-A catalyst in a batch reactor.…”

Section: Introductionmentioning

confidence: 99%

Hydrogenation of Succinic Acid to γ-Butyrolactone (GBL) Over Palladium-Alumina Composite Catalyst Prepared by a Single-Step Sol–Gel Method

et al. 2010

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“…So, more hydrogen was charged intermittently from the cylinder through manually operated control valve, thus maintaining a constant partial pressure of hydrogen. Samples were withdrawn periodically after sufficient flushing of the sample line with the reaction mixture [15][16][17].…”

Section: Methodsmentioning

confidence: 99%

Catalytic Hydrogenation of Dimethyl-Nitrobenzene to Dimethyl-Aniline in a Three-Phase Reactor: Reaction Kinetics and Operation Condition

Kazemimoghadam¹

2017

AJPC

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Abstract:The catalytic transfer hydrogenation of dimethyl-nitrobenzene (DN) to Dimethyl-aniline (DA) was studied in the temperature range 343-403 K , pressure range of 4-10 bar H 2 and ethanol as solvent using Ni on alumina-silicate as catalyst above agitation speed 800 rpm. The substrate feed concentration was varied in the range from 0.124 to 0.745 kmol/m 3 while catalyst loading was in the range 4-12% (w/w) of dimethyl-nitrobenzene. Dimethyl-aniline was the only reaction product, generated through the hydrogenation of the Nitro group of dimethyl-nitrobenzene. The effects of hydrogen partial pressure, catalyst loading, dimethyl-nitrobenzene concentration and temperature on the reaction conversion have been reported. Near first-order dependence on dimethyl-nitrobenzene concentration and hydrogen pressure were observed for the initial rate of dimethyl-nitrobenzene hydrogenation over the Ni catalyst. Furthermore, an increase in the catalytic activity as the reaction temperature, pressure and weight of catalysts was observed. Conventional Arrhenius behavior was exhibited by catalyst, Ni showed activation energies of 808 J/mol.

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Section: Methodsmentioning

confidence: 99%

Hydrogenation Process Analysis with a Slurry Reactor

Kazemimoghadam¹

2017

IJASE

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ABSTRACT:The liquid-phase catalytic hydrogenation of dimethyl-nitrobenzene (DN) to Dimethyl-aniline (DA) was carried out in ethanol using 5% Pd/C as a catalyst. The effects of hydrogen partial pressure (400-1000 kPa), reaction temperature (343-403⁰K), catalyst loading (5-15 g/lit), speed of stirring range (200-800 rpm) and dimethylnitrobenzene concentration (0.12-0.75 mol/lit) on the hydrogenation of dimethyl-nitrobenzene and the yield of Dimethyl-aniline have been studied. Dimethyl-aniline was the only reaction product, generated through the hydrogenation of the Nitro group of dimethyl-nitrobenzene. The effects of hydrogen partial pressure, catalyst loading, dimethyl-nitrobenzene concentration and temperature on the reaction conversion have been reported. Near first-order dependence on dimethyl-nitrobenzene concentration and hydrogen pressure were observed for the initial rate of dimethyl-nitrobenzene hydrogenation over the 5% Pd/C catalyst. Conventional Arrhenius behavior was exhibited by catalyst, Pd/C showed activation energies of 614 J/mol. A simple power law model was used for analysis of the reaction kinetic data.

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Palladium-catalyzed liquid-phase hydrogenation/hydrogenolysis of disulfides

Cited by 24 publications

References 31 publications

Hydrogenation of Succinic Acid to γ-Butyrolactone (GBL) Over Palladium-Alumina Composite Catalyst Prepared by a Single-Step Sol–Gel Method

Hydrogenation of Succinic Acid to γ-Butyrolactone (GBL) Over Palladium-Alumina Composite Catalyst Prepared by a Single-Step Sol–Gel Method

Catalytic Hydrogenation of Dimethyl-Nitrobenzene to Dimethyl-Aniline in a Three-Phase Reactor: Reaction Kinetics and Operation Condition

Hydrogenation Process Analysis with a Slurry Reactor

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