Role of Mn+ cations in the redox and oxygen transfer properties of BaMxAl12-xO19-delta (M = Mn, Fe, Co) nanomaterials for high temperature methane oxidation

S. Laassiri (1, 2) , N. Bion (1) , D. Duprez (1) , H. Alamdari (2) , S. Royer (1, 2)

1 IC2MP [Poitiers] - Institut de chimie des milieux et matériaux de Poitiers [UMR 7285]
2 ULaval - Université Laval [Québec]

BaMxAl12-xO19-delta (M = Mn, Fe, Co, x = 1, 2) hexaaluminate nanomaterials were successfully prepared using the ARS (Activated Reactive Synthesis) process, a top-down and solvent free original synthesis route. The crystal sizes of the nanomaterials range at 24 +/- 2 nm, which allows them to display high surface area (from 60 to 100 m(2) g(-1)). The role of Mn+ cations in the redox and oxygen transfer properties of the nanomaterials was studied by H-2-TPR and O-18/O-16 isotopic exchange, respectively. The nature of the transition metal as well as its content is observed to play a key role in the oxygen transfer properties. The catalytic properties of the nano-hexaaluminates, evaluated for methane oxidation, a reaction involving severe conditions (high temperature), resulted from multiple factors including oxygen transfer properties and transition metal valence and concentration on the surface

Domaines: Catalyse; Chimie organique; Autre

S. Laassiri, N. Bion, D. Duprez, H. Alamdari, S. Royer. Role of Mn+ cations in the redox and oxygen transfer properties of BaMxAl12-xO19-delta (M = Mn, Fe, Co) nanomaterials for high temperature methane oxidation. Catalysis Science & Technology, 2013, 3 (9), pp.2259-2269. ⟨10.1039/c3cy00192j⟩. ⟨hal-00860303⟩