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Carlos Rodolfo Apesteguia - One of the best experts on this subject based on the ideXlab platform.
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Impact of solvent on Co/SiO2 activity and selectivity for the synthesis of n-Butylamine from butyronitrile hydrogenation
Catalysis Communications, 2015Co-Authors: Dario Jobino Segobia, Andres Fernando Trasarti, Carlos Rodolfo ApesteguiaAbstract:Abstract The impact of solvent on Co(9.8%)/SiO2 activity and selectivity for the synthesis of n-Butylamine from butyronitrile hydrogenation was investigated using methanol, benzene, toluene and cyclohexane as solvents. In non-polar solvents, the yield of n-Butylamine increased from 60% to 79% following the order cyclohexane
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Conversion of butyronitrile to Butylamines on noble metals: effect of the solvent on catalyst activity and selectivity
Catal. Sci. Technol., 2014Co-Authors: Dario Jobino Segobia, Andres Fernando Trasarti, Carlos Rodolfo ApesteguiaAbstract:The liquid-phase hydrogenation of butyronitrile to Butylamines was studied on Pt(0.27%)/SiO2, Pd(0.33%)/SiO2 and Ru(1.80%)/SiO2 using n-butanol, toluene and cyclohexane as solvents. In n-butanol, Pt and Pd catalysts formed preponderantly diButylamine and minor amounts of triButylamine while Ru/SiO2 yielded mainly Butylamine. Replacing n-butanol by toluene or cyclohexane caused significant changes in catalyst activity and selectivity. These changes were interpreted by relating the catalyst performance with the solvent–catalyst interaction strength that was investigated by temperature-programmed desorption of solvents and mass spectrometry. Pd/SiO2 was strongly deactivated with the progress of the reaction in all the solvents.
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Synthesis of n-Butylamine from Butyronitrile on Ni/SiO2: Effect of Solvent
Journal of the Brazilian Chemical Society, 2014Co-Authors: Dario Jobino Segobia, Andres Fernando Trasarti, Carlos Rodolfo ApesteguiaAbstract:The effect of solvent on Ni(10.5%)/SiO2 activity and selectivity for the liquid-phase hydrogenation of butyronitrile to Butylamines was studied at 373 K and 13 bar using ethanol, benzene, toluene and cyclohexane as solvents. In ethanol, a protic solvent, the Ni catalyst yielded n-Butylamine (84%) and diButylamine (16%). When non-polar solvents, such as cyclohexane, toluene or benzene, were used, the solvent-catalyst interaction strength determined the selectivity to n-Butylamine: the stronger the solvent-catalyst interaction the higher the n-buylamine production. The yield to n-Butylamine in non-polar solvents varied between 39% (cyclohexane) and 63% (benzene).
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Hydrogenation of nitriles to primary amines on metal-supported catalysts: Highly selective conversion of butyronitrile to n-Butylamine
Applied Catalysis A-general, 2012Co-Authors: Dario Jobino Segobia, Andres Fernando Trasarti, Carlos Rodolfo ApesteguiaAbstract:Abstract The selective liquid-phase hydrogenation of butyronitrile to n-Butylamine was studied in a batch reactor on Co(9.8%)/SiO2, Ni(10.5%)/SiO2, Cu(9.2%)/SiO2, Pt(0.27%)/SiO2, Pd(0.33%)/SiO2, and Ru(1.8%)/SiO2 catalysts. At 373 K and 13 bar (H2), the initial butyronitrile conversion rate ( r BN 0 , mmol/h g) followed the order Ni > Co > Pt > Ru > Cu > Pd. Cu/SiO2 and Pd/SiO2 did not form n-Butylamine and rapidly deactivated during the progress of the reaction. Pt/SiO2 produced mainly diButylamine and only minor amounts of n-Butylamine and triButylamine. In contrast, Ru/SiO2 formed preponderantly n-Butylamine but also produced significant amounts of diButylamine and butylidene–Butylamine, an intermediate in the formation pathway of the secondary amine. The highest yield to n-Butylamine was obtained on Ni/SiO2 (84%). Co/SiO2 was initially highly selective to n-Butylamine but with the progress of the reaction the Butylamine concentration in the reaction mixture diminished because it partially reacted with the solvent (ethanol) to form N-ethylButylamine. In an attempt to reduce the formation of byproducts, Ni/SiO2 and Co/SiO2 catalysts were tested at lower temperatures and higher H2 pressures. Butyronitrile was selectively converted to n-Butylamine on Co/SiO2 at 343 K and 25 bar, yielding 97% of n-Butylamine, similarly to the highest yields reported on Raney Co catalysts.
Jacques Jose - One of the best experts on this subject based on the ideXlab platform.
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experimental determination of the isothermal vapour liquid equilibria of binary aqueous solutions of sec Butylamine and cyclohexylamine at several temperatures
The Journal of Chemical Thermodynamics, 2012Co-Authors: Nouria Chialibaba Ahmed, Ahmed Ait Kaci, Latifa Negadi, Ilham Mokbel, Jacques JoseAbstract:The vapour pressures of (sec-Butylamine + water), (cyclohexylamine + water) binary mixtures, and of pure sec-Butylamine and cyclohexylamine components were measured by means of two static devices at temperatures between 293 (or 273) K and 363 K. The data were correlated with the Antoine equation. From these data, excess Gibbs functions (GE) were calculated for several constant temperatures and fitted to a fourth-order Redlich-Kister equation using the Barker's method. The (cyclohexylamine + water) system shows positive azeotropic behaviour for all investigated temperatures. The two binary mixtures exhibit positive deviations in GE for all investigated temperatures over the whole composition range. Highlights Vapour pressures of sec-Butylamine or cyclohexylamine and their aqueous solutions. The investigated temperatures are 273 K and 363 K. The (cyclohexylamine + water) mixture shows positive azeotropic behaviour. The (sec-Butylamine + water) or (cyclohexylamine + water) exhibit positive GE.
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Experimental determination of the isothermal (vapour + liquid) equilibria of binary aqueous solutions of sec-Butylamine and cyclohexylamine at several temperatures
Journal of Chemical Thermodynamics, 2012Co-Authors: Nouria Chiali-baba Ahmed, Latifa Negadi, Ilham Mokbel, Ahmed Ait Kaci, Jacques JoseAbstract:The vapour pressures of (sec-Butylamine + water), (cyclohexylamine + water) binary mixtures, and of pure sec-Butylamine and cyclohexylamine components were measured by means of two static devices at temperatures between 293 (or 273) K and 363 K. The data were correlated with the Antoine equation. From these data, excess Gibbs functions (GE) were calculated for several constant temperatures and fitted to a fourth-order Redlich-Kister equation using the Barker's method. The (cyclohexylamine + water) system shows positive azeotropic behaviour for all investigated temperatures. The two binary mixtures exhibit positive deviations in GE for all investigated temperatures over the whole composition range. Highlights Vapour pressures of sec-Butylamine or cyclohexylamine and their aqueous solutions. The investigated temperatures are 273 K and 363 K. The (cyclohexylamine + water) mixture shows positive azeotropic behaviour. The (sec-Butylamine + water) or (cyclohexylamine + water) exhibit positive GE.
Alexis T. Bell - One of the best experts on this subject based on the ideXlab platform.
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Zeolite-Catalyzed Isobutene Amination: Mechanism and Kinetics
ACS Catalysis, 2019Co-Authors: Christopher R. Ho, La Bettinson, Jeongmoon Choi, Martin Head-gordon, Alexis T. BellAbstract:Amination of isobutene with NH3 was investigated over Bronsted acidic zeolites at 1 atm and 453–483 K. To compare catalytic activities over different zeolites, the measured reaction rates are normalized by the number of active sites determined by tert-Butylamine temperature-programmed desorption (TPD). Small- and medium-pore zeolites with one-dimensional channels exhibit low activity because of pore blockage by adsorbed tert-butylammonium ions. However, turnover frequencies and activation energies are not sensitive to framework identity, as long as the active site is accessible to isobutene and tert-Butylamine. Kinetic measurements and FTIR spectroscopy reveal that the Bronsted acid sites in MFI are covered predominantly with tert-butylammonium ions under reaction conditions. The desorption of tert-Butylamine is assisted by the concurrent adsorption of isobutene. DFT simulations show that at very low tert-Butylamine partial pressures, for example, at the inlet to the reactor, tert-Butylamine desorption is...
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Synthesis of Butyronitrile via Ammonolysis of Butylalcohol and Dehydrogenation of Butylamine over Mo2N
Journal of Catalysis, 1993Co-Authors: H. Abe, Alexis T. BellAbstract:Investigations were carried out of the synthesis of butyronitrile via the ammonolysis of butylalcohol and the dehydrogenation of Butylamine over Mo[sub 2]N. At 573 K butyronitrile is produced with virtually 100% yielded by both reactions. The ammonolysis of butylalcohol proceeds via dehydrogenation of the butylalcohol to form butyraldehyde, which then reacts with ammonia to produce butylimine. Butyronitrile is formed by butylimine dehydrogenation. The formation of butyronitrile from Butylamine occurs via the stepwise dehydrogenation of the amine. The presence of ammonia in the gas phase suppresses the hydrogenolysis of either butylalcohol or Butylamine. 11 refs., 8 figs., 2 tabs.
Dario Jobino Segobia - One of the best experts on this subject based on the ideXlab platform.
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Impact of solvent on Co/SiO2 activity and selectivity for the synthesis of n-Butylamine from butyronitrile hydrogenation
Catalysis Communications, 2015Co-Authors: Dario Jobino Segobia, Andres Fernando Trasarti, Carlos Rodolfo ApesteguiaAbstract:Abstract The impact of solvent on Co(9.8%)/SiO2 activity and selectivity for the synthesis of n-Butylamine from butyronitrile hydrogenation was investigated using methanol, benzene, toluene and cyclohexane as solvents. In non-polar solvents, the yield of n-Butylamine increased from 60% to 79% following the order cyclohexane
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Conversion of butyronitrile to Butylamines on noble metals: effect of the solvent on catalyst activity and selectivity
Catal. Sci. Technol., 2014Co-Authors: Dario Jobino Segobia, Andres Fernando Trasarti, Carlos Rodolfo ApesteguiaAbstract:The liquid-phase hydrogenation of butyronitrile to Butylamines was studied on Pt(0.27%)/SiO2, Pd(0.33%)/SiO2 and Ru(1.80%)/SiO2 using n-butanol, toluene and cyclohexane as solvents. In n-butanol, Pt and Pd catalysts formed preponderantly diButylamine and minor amounts of triButylamine while Ru/SiO2 yielded mainly Butylamine. Replacing n-butanol by toluene or cyclohexane caused significant changes in catalyst activity and selectivity. These changes were interpreted by relating the catalyst performance with the solvent–catalyst interaction strength that was investigated by temperature-programmed desorption of solvents and mass spectrometry. Pd/SiO2 was strongly deactivated with the progress of the reaction in all the solvents.
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Synthesis of n-Butylamine from Butyronitrile on Ni/SiO2: Effect of Solvent
Journal of the Brazilian Chemical Society, 2014Co-Authors: Dario Jobino Segobia, Andres Fernando Trasarti, Carlos Rodolfo ApesteguiaAbstract:The effect of solvent on Ni(10.5%)/SiO2 activity and selectivity for the liquid-phase hydrogenation of butyronitrile to Butylamines was studied at 373 K and 13 bar using ethanol, benzene, toluene and cyclohexane as solvents. In ethanol, a protic solvent, the Ni catalyst yielded n-Butylamine (84%) and diButylamine (16%). When non-polar solvents, such as cyclohexane, toluene or benzene, were used, the solvent-catalyst interaction strength determined the selectivity to n-Butylamine: the stronger the solvent-catalyst interaction the higher the n-buylamine production. The yield to n-Butylamine in non-polar solvents varied between 39% (cyclohexane) and 63% (benzene).
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Hydrogenation of nitriles to primary amines on metal-supported catalysts: Highly selective conversion of butyronitrile to n-Butylamine
Applied Catalysis A-general, 2012Co-Authors: Dario Jobino Segobia, Andres Fernando Trasarti, Carlos Rodolfo ApesteguiaAbstract:Abstract The selective liquid-phase hydrogenation of butyronitrile to n-Butylamine was studied in a batch reactor on Co(9.8%)/SiO2, Ni(10.5%)/SiO2, Cu(9.2%)/SiO2, Pt(0.27%)/SiO2, Pd(0.33%)/SiO2, and Ru(1.8%)/SiO2 catalysts. At 373 K and 13 bar (H2), the initial butyronitrile conversion rate ( r BN 0 , mmol/h g) followed the order Ni > Co > Pt > Ru > Cu > Pd. Cu/SiO2 and Pd/SiO2 did not form n-Butylamine and rapidly deactivated during the progress of the reaction. Pt/SiO2 produced mainly diButylamine and only minor amounts of n-Butylamine and triButylamine. In contrast, Ru/SiO2 formed preponderantly n-Butylamine but also produced significant amounts of diButylamine and butylidene–Butylamine, an intermediate in the formation pathway of the secondary amine. The highest yield to n-Butylamine was obtained on Ni/SiO2 (84%). Co/SiO2 was initially highly selective to n-Butylamine but with the progress of the reaction the Butylamine concentration in the reaction mixture diminished because it partially reacted with the solvent (ethanol) to form N-ethylButylamine. In an attempt to reduce the formation of byproducts, Ni/SiO2 and Co/SiO2 catalysts were tested at lower temperatures and higher H2 pressures. Butyronitrile was selectively converted to n-Butylamine on Co/SiO2 at 343 K and 25 bar, yielding 97% of n-Butylamine, similarly to the highest yields reported on Raney Co catalysts.
Deqing Liang - One of the best experts on this subject based on the ideXlab platform.
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Hydrate phase equilibrium for the (hydrogen + tert-Butylamine + water) system
The Journal of Chemical Thermodynamics, 2011Co-Authors: Deqing Liang, Xing-xue DaiAbstract:Abstract The three-phase equilibrium conditions of ternary (hydrogen + tert-Butylamine + water) system were first measured under high-pressure in a “full view” sapphire cell. The tert-Butylamine–hydrogen binary hydrate phase transition points were obtained through determining the points of intersection of three phases (H–L w –V) to two phases (L w –V) experimentally. Measurements were made using an isochoric method. Firstly, (tetrahydrofuran + hydrogen) binary hydrate phase equilibrium data were determined with this method and compared with the corresponding experimental data reported in the literatures and the acceptable agreements demonstrated the reliability of the experimental method used in this work. The experimental investigation on (tert-Butylamine + hydrogen) binary hydrate phase equilibrium was then carried out within the temperature range of (268.4 to 274.7) K and in the pressure range of (9.54 to 29.95) MPa at (0.0556, 0.0886, 0.0975, and 0.13) mole fraction of tert-Butylamine. The three-phase equilibrium curve (H + L w + V) was found to be dependent on the concentration of tert-Butylamine solution. Dissociation experimental results showed that tert-Butylamine as a hydrate former shifted hydrate stability region to lower pressure and higher temperature.
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hydrate equilibrium data for methane tert Butylamine water
Journal of Chemical & Engineering Data, 2010Co-Authors: Deqing LiangAbstract:Hydrate equilibrium pressures of methane + tert-Butylamine + water were investigated in the temperature range of (281.2 to 295.2) K and in the pressure range of (2.69 to 8.46) MPa at (0.01, 0.056, and 0.097) mole fraction of tert-Butylamine. Measurements were made using an isochoric method. The addition of tert-Butylamine causes the hydrate equilibrium pressure to be lowered. In the case of higher mole fraction x = (0.056, 0.097), the hydrate has a lower equilibrium pressure than that of mole fraction x = (0.01).
