Monodispersed Pd-nanoparticles on carbon fiber fabrics as structured catalyst for selective hydrogenation

Monodispersed Pd-nanoparticles (similar to 8nm) prepared via a modified microemulsion method were deposited on active carbon fibers (ACF) fabrics and studied in a semi-batch 1-hexyne liquid-phase hydrogenation. The catalyst Pd(0.45 wt%)/ACF demonstrated > 96% selectivity to 1-hexene up to 90% of conversion. Initial activity at 303 K, 1.3 MPa pressure, in D-heptane as a solvent was 0.14 kmo1H(2) kg(Pd)(-1) S-1. Assuming a Langmuir-Hinshelwood kinetics with a weak hydrogen adsorption a kinetic model was developed. It was shown to be consistent with the experimental data and allowed determining the main kinetic parameters. (c) 2006 Elsevier Ltd. All rights reserved.

À propos de ce résultat

Cette page est générée automatiquement et peut contenir des informations qui ne sont pas correctes, complètes, à jour ou pertinentes par rapport à votre recherche. Il en va de même pour toutes les autres pages de ce site. Veillez à vérifier les informations auprès des sources officielles de l'EPFL.

Concepts associés

Chargement

Publications associées

Chargement

Lioubov Kiwi, Albert Renken
2007
Article

Résumé

Official source

https://infoscience.epfl.ch/record/112948?ln=fr

À propos de ce résultat

Concepts associés (10)

Concepts associés

Chargement

Publications associées (3)

Publications associées

Chargement

Catalyse

vignette|Intérieur du musée de la catalyse à Widnes en Angleterre. En chimie, la catalyse (du grec ancien : , « détacher ») se réfère à l'accélération ou la réorientation de la cinétique de réaction

Hydrogénation

L'hydrogénation est une réaction chimique qui consiste en l'addition d'une molécule de dihydrogène (H2) à un autre composé. Cette réaction est habituellement employée pour réduire ou saturer des com

Fibre de carbone

vignette|Petits morceaux de fibres de carbone (longueur 8 mm). La fibre de carbone se compose de fibres extrêmement fines, d'environ cinq à dix micromètres de diamètre, et est composée principalement

Solvent-Free Selective Hydrogenation of 2-Butyne-1,4-diol over Structured Palladium Catalyst

Eric Joannet, Lioubov Kiwi, Albert Renken

Hydrogenation of 2-butyne-1,4-diol catalyzed by Pd nanoparticles on activated carbon fibers (ACFs) was studied. The ACF support in the form of woven fabrics provides the basis for structured catalytic fixed beds. In the present study, this catalyst was integrated in the stirrer of an autoclave. Hydrogenations were carried out in pure, solvent-free butynediol at temps. from 352 to 392 K and hydrogen pressures of 1-2 MPa. The results were compared to those obtained for aq. solns. at different pH's and temps. of 293-333 K. High selectivities of >=98% toward 2-butene-1,4-diol at conversions of ?90% were attained in both systems. Turnover frequencies had comparable values at the same temp. The activation energy of 30 kJ/mol was detd. from initial reaction rates. Because this value is identical for the aq. soln. and the solvent-free system, mass-transfer limitations can be excluded for both systems. Concn.-time profiles were quant. predicted assuming the Langmuir-Hinshelwood kinetics with weak hydrogen adsorption. Estd. kinetic parameters allow a coherent interpretation of the exptl. observations. Catalyst reactivation and multiple reuses were demonstrated. [on SciFinder (R)]

American Chemical Society2005

Chargement

Palladium supported on filamentous active carbon as effective catalyst for liquid-phase hydrogenation of 2-butyne-1,4-diol to 2-butene-1,4-diol

Chrystèle Horny, Eric Joannet, Lioubov Kiwi, Albert Renken

Structured palladium catalysts suitable for three-phase reactions have been developed based on woven fabrics of active carbon fibers (ACF) as the catalytic supports. The Pd/ACF were tested in liq.-phase hydrogenation of 2-butyne-1,4-diol showing a selectivity towards 2-butene-1,4-diol up to 97% at conversions up to 80%. Multiple reuse of the catalyst with stable activity/selectivity in a batch reactor was also demonstrated. The reaction kinetics was studied and the main kinetic parameters were obtained. Assuming a Langmuir-Hinshelwood kinetics and a weak hydrogen adsorption a suitable kinetic model was developed consistent with the exptl. data. [on SciFinder (R)]

2002

Chargement

Highly dispersed cobalt oxides nanoparticles on activated carbon fibres as efficient structured catalysts for the transfer hydrogenation of m-nitrostyrene

Oliver Anthony Beswick, Paul Joseph Dyson, Lioubov Kiwi, Alexander Parastaev

The facile preparation of structured catalysts featuring highly-dispersed non-precious metal (Fe, Ni, Co) oxide nanoparticles stabilized within a super-microporous network of activated carbon fibres (ACF) is described. The catalyst morphology was controlled over multiple levels from the nano-designed active phase up to the macro-structure of the ACF support. A range of physicochemical techniques was used to characterize the catalyst and rationalize the catalytic data during chemoselective transfer hydrogenation of nitroarenes. The challenging reduction of m-nitrostyrene containing an easily reducible vinyl-group was obtained under mild conditions with a near-quantitative yield of m-vinylaniline using hydrazine hydrate as the reducing agent over CoOx/ACF as a structured catalyst. (C) 2016 Elsevier B.V. All rights reserved.

Elsevier Science Bv2017

Chargement