Effect of the carbon pre-treatment on the properties and performance for nitrobenzene hydrogenation of Pt/C catalysts

Torres, Gerardo; Jablonski, E.L.; Baronetti, Graciela T.; Castro, Alberto A.; Miguel, Sergio R. de; Scelza, Osvaldo A.; Blanco, Miriam; Jiménez, Manuel García; Fierro, J.L.G.

doi:10.1016/s0926-860x(97)00071-9

Cited by 124 publications

(62 citation statements)

References 19 publications

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“…It has also been known that catalysts supported on functionalized carbon could not tolerate high thermal treatment, due to the instability of surface oxygen groups of the support, which act as primary anchoring centres for metal precursors, facilitating the high dispersion of the metal phase [49][50][51][52][53].…”

Section: Preparation Of Sn-pt/c Electrocatalystsmentioning

confidence: 99%

Controlled Synthesis of Pt3Sn/C Electrocatalysts with Exclusive Sn–Pt Interaction Designed for Use in Direct Methanol Fuel Cells

et al. 2013

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Section: Preparation Of Sn-pt/c Electrocatalystsmentioning

confidence: 99%

Controlled Synthesis of Pt3Sn/C Electrocatalysts with Exclusive Sn–Pt Interaction Designed for Use in Direct Methanol Fuel Cells

et al. 2013

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“…It is commonly used to manufacture amines, which are important intermediates for dyes, urethanes, agro-chemicals and pharmaceuticals [1][2][3], for instance in the synthesis of sildenafil (Viagra) (4), the antibiotic linezolid (Zyvox) and the HIV ptotease inhibitor amprenavir (agenerase). Thus, exploring new catalysts or methods to achieve chemoselective hydrogenation of nitrocompounds has attracted considerable attention [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…With regard to the hydrogenation of nitrobenzene, which is used to produce aniline, the reaction can be carried out in gas or liquid phase by using supported metal catalysts an organic solvents such as alcohols, acetone, benzene, ethyl acetate, or aqueous acidic solutions [9,[18][19][20] and CO 2 under supercritical conditions [21]. The use of these solvents has some drawbacks owing to their toxicity, flammability, or environmental hazards.…”

Section: Introductionmentioning

confidence: 99%

HYDROGENATION OF NITROBENZENE ON Au/ZrO2 CATALYSTS

Gómez

Torres

Fierro

et al. 2012

J. Chil. Chem. Soc.

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The hydrogenation of nitrobenzene at 298K and pressure of 40 bar of H 2 over zirconia supported Au catalysts has been studied. Three different procedures were used to prepare 1wt% of Au/ZrO 2 catalysts: i) An impregnation method using HAuCl 4 as gold precursor ii)Depositation precipitation of Au nanoparticles generated in the presence of urea and iii) Deposition of Gold nanoparticles generated in presence of cetryltrimethylammonium bromide (CTMABR) as surfactant. The catalysts were characterized by nitrogen adsorption-desorption isotherms at 77 K, XRD, TEM and XPS techniques. The reactions were carried out in a stainless steel batch reactor using ethanol as solvent. The catalysts exhibits a higher selectivity to aniline, with low accumulation of intermediate products. The kinetic study displayed orders 1 respect to hydrogen pressure and to the substrate concentration (nitrobenzene), and the activation energy was 67.2 KJ/mol.

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“…Industrially, the reaction is operated in gas phase with Cu or Ni catalysts using H 2 near or slightly above atmospheric pressure (0.1-0.5 MPa) at high temperatures around 523 K [9][10][11][12][13]. It can also be performed in the liquid phase by using supported metal catalysts (Pt, Pd, and Ni) and organic solvents with H 2 of higher pressures (1-4 MPa) at temperatures around 323 K [14][15][16][17][18][19][20]. However, these catalysts sometimes show low selectivity to anilines because of the formation of several poisonous reaction intermediates such as nitrosobenzenes, phenylhydroxyamines, azoxybenzenes, and azobenzenes whose formation and accumulation should be avoided for the green production of anilines.…”

Section: Introductionmentioning

confidence: 99%

Selective hydrogenation of nitrostyrene to aminostyrene over Pt/TiO2 catalysts: Effects of pressurized carbon dioxide and catalyst preparation conditions

Fujita

Yoshida

Asai

et al. 2011

The Journal of Supercritical Fluids

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The present work has studied the influence of CO 2 pressurization on the hydrogenation of nitrostyrene (NS) using Pt/TiO 2 . With CO 2 pressurization up to 12 MPa (CO 2 -dissolved expanded liquid (CXL) phase), the over-all reaction rate and the selectivity to aminostyrene (AS) increased. At higher CO 2 pressures where all NB dissolved in scCO 2 (scCO 2 -homogeneous phase), both of them decreased with increasing the CO 2 pressure. The phase behavior was an important factor for the present reaction system. It was also found that the presence of pressurized CO 2 gave higher selectivity to AS than in its absence at any conversion level. This was ascribed to retardation effects of dense phase CO 2 on the hydrogenation of AS to ethylaniline. Competitive adsorption of nitro and vinyl groups was suggested to determine the product selectivity. FTIR measurements showed that the pressurized CO 2 lowers the reactivity of the nitro group, and this effect is stronger in scCO 2 -homogeneous phase than in CXL phase, resulting in the lower AS selectivity in the former phase. Lower Pt loadings and higher catalyst reduction temperatures gave Pt/TiO 2 catalysts more selective for the AS formation. FTIR measurements of adsorbed CO over the catalysts suggested that the presence of less-coordinated Pt atoms on edge, corner and kink sites was significant for the selective hydrogenation of NS to AS.

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Effect of the carbon pre-treatment on the properties and performance for nitrobenzene hydrogenation of Pt/C catalysts

Cited by 124 publications

References 19 publications

Controlled Synthesis of Pt3Sn/C Electrocatalysts with Exclusive Sn–Pt Interaction Designed for Use in Direct Methanol Fuel Cells

Controlled Synthesis of Pt3Sn/C Electrocatalysts with Exclusive Sn–Pt Interaction Designed for Use in Direct Methanol Fuel Cells

HYDROGENATION OF NITROBENZENE ON Au/ZrO2 CATALYSTS

Selective hydrogenation of nitrostyrene to aminostyrene over Pt/TiO2 catalysts: Effects of pressurized carbon dioxide and catalyst preparation conditions

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