CROISÉ, Charlotte; ALABD, Khaled; TENCÉ, Sophie; GAUDIN, Etienne; VILLESUZANNE, Antoine; COURTOIS, Xavier; BION, Nicolas; CAN, Fabien

doi:10.1002/cctc.202201172

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http://creativecommons.org/licenses/by-nc-nd/

CROISÉ, Charlotte
Institut de chimie des milieux et matériaux de Poitiers [UMR 7285] [IC2MP [Poitiers]]

ALABD, Khaled
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

TENCÉ, Sophie
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Article de revue

Ce document a été publié dans

ChemCatChem. 2023, vol. 15, n° 3, p. e202201172 (12 p.)

Wiley

Résumé en anglais

This study investigates the influence of the rare-earth (R) element in Ru/RScSi electride-like intermetallic catalysts for ammonia synthesis under mild conditions (300–450 °C; 1–5 bar). All materials present poor specific surface area and the grain size impacts the ammonia yield. The catalytic performances follow the La to Gd lanthanides series (Ru1.7/LaScSi=Ru1.7/CeScSi=Ru1.7/PrScSi>Ru1.7/NdScSi>Ru1.5/SmScSi>Ru1.3/GdScSi) and appear correlated with the formation of the hydride phase. Ru1.7/CeScSi shows remarkable catalytic activity under moderate condition (0.58 mmolNH3/h/g at 300 °C, 1 bar) associated with its reversible hydrogen storage–release properties. It is evidenced that RScSi materials assist the N2 dissociation in agreement with their electride character and that the hydrogen for NH3 formation mainly comes from gaseous hydrogen and not primarily from the hydride phase. It is suggested that NHX formation could be the rate determining step rather than the N2 cleavage over these catalysts.< Réduire

Mots clés en anglais

hydride

intermetallic

NH3

ruthenium

transient experiments

DOI

http://dx.doi.org/10.1002/cctc.202201172

Project ANR

Electrures intermétalliques : De nouveaux matériaux pour la synthèse catalytique de l'ammoniac - ANR-19-CE07-0023

Origine

Importé de hal

Unités de recherche

Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB) - UMR 5026