Effect of thermal treatment on the textural properties of CeO2 powders synthesized in near- and supercritical alcohols
Langue
en
Article de revue
Ce document a été publié dans
ChemPhysChem. 2015, vol. 16, n° 16, p. 3493–3499
Wiley-VCH Verlag
Résumé en anglais
CeO2 nanocrystals (NCs) have attracted increasing interest over the past few years, in particular for their use in catalytic reactions. Syntheses mediated by near- and supercritical alcohols have proven to be innovative ...Lire la suite >
CeO2 nanocrystals (NCs) have attracted increasing interest over the past few years, in particular for their use in catalytic reactions. Syntheses mediated by near- and supercritical alcohols have proven to be innovative ways to obtain CeO2 NCs with controlled crystallite sizes (from 3 to 8 nm depending on the alcohol) and surface functionalities, with alcohol moieties. When submitted to a thermal treatment at 500 °C, required to desorb/degrade surface organic species, these powders displayed different behaviors depending on the alcohol used during the synthesis. Cerium oxide powders synthesized in sc-MeOH, sc-EtOH and sc-iPrOH undergo sintering during treatment at 500 °C, with a decrease of their specific surface area. Conversely, those synthesized in sc-BuOH, nc-PentOH and nc-HexOH keep their initial crystallite sizes and morphology, but show a great enhancement of their specific surface area (up to 200 m2 g-1 ), which is unprecedented after such a thermal treatment.< Réduire
Mots clés en anglais
alcohols
cerium oxide
specific surface area
supercritical fluids
thermal treatment
Origine
Importé de halUnités de recherche