Understanding Oxygen Release from Nanoporous Perovskite Oxides and Its Effect on the Catalytic Oxidation of CH4 and CO - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue ACS Applied Materials & Interfaces Année : 2021

Understanding Oxygen Release from Nanoporous Perovskite Oxides and Its Effect on the Catalytic Oxidation of CH4 and CO

Elisa Poffe
  • Fonction : Auteur
Benedikt Ehrhardt
  • Fonction : Auteur
Lara Gigli
  • Fonction : Auteur
Luca Nodari
  • Fonction : Auteur
Silvia Gross
  • Fonction : Auteur
Simone Mascotto
  • Fonction : Auteur
  • PersonId : 1116149

Résumé

The design of nanoporous perovskite oxides is considered an efficient strategy to develop performing, sustainable catalysts for the conversion of methane. The dependency of nanoporosity on the oxygen defect chemistry and the catalytic activity of perovskite oxides towards CH4 and CO oxidation was here studied. A novel colloidal synthesis route for nanoporous, high-temperature stable SrTi0.65Fe0.35O3-δ with specific surface area (SSA) ranging from 45 to 80 m2 /g and pores from 10 to 100 nm was developed. High-temperature investigations by in situ synchrotron XRD and TG-MS combined with H2-TPR and Mössbauer spectroscopy showed that the porosity improved the release of surface oxygen and the oxygen diffusion, whereas the release of lattice oxygen depended more on the state of the iron species and strain effects in the materials. Regarding catalysis, light-off tests showed that low-temperature CO oxidation significantly benefitted from the enhancement of the SSA, whereas high-temperature CH4 oxidation is influenced more from the dioxygen release. During isothermal long-term catalysis tests however the continuous oxygen release from large SSA materials promoted both CO and CH4 conversion. Hence, if SSA maximization turned out to efficiently improve low-temperature and long-term catalysis applications, the role of both reducible metal center concentration and crystal structure cannot be completely ignored, as they also contribute to the perovskite oxygen release properties.

Domaines

Chimie
Fichier principal
Vignette du fichier
PolyolsSTF35_R1_noHL.pdf (1.87 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-03419535 , version 1 (08-11-2021)

Identifiants

Citer

Elisa Poffe, Helena Kaper, Benedikt Ehrhardt, Lara Gigli, Daniel Aubert, et al.. Understanding Oxygen Release from Nanoporous Perovskite Oxides and Its Effect on the Catalytic Oxidation of CH4 and CO. ACS Applied Materials & Interfaces, 2021, ⟨10.1021/acsami.1c02281⟩. ⟨hal-03419535⟩

Collections

CNRS INC-CNRS
19 Consultations
155 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More