Etude des catalyseurs hétérogènes à base de Co en conditions réactives "réalistes" par microscopie électronique in-situ et opérando

Abstract : In this work, we studied cobalt catalysts used in producing hydrocarbons through the Fischer-Trospch synthesis process, in which their activation, operation and deactivation mechanisms are recorded using in-situ and environmental transmission electron microscopy. An operando methodology was developed by combining electron microscopy-based structural studies in an environmental cell and mass spectrometry analysis of the reacting gases. Using controlled-morphology nanocatalysts we have demonstrated that deactivation occurs through particles sintering, re-oxidation, encapsulation and carburization. The activation of supported catalysts arises due to particles densification. It was clearly established that the reduction of the nanoparticles is better enhanced on a silica support than on an alumina one. Also, Pt doping of the catalysts greatly increases their reduction. By analysing the hydrocarbons formed during the Fischer-Tropsch reactions of a series of cobalt catalysts, we could obtain a comprehensive physico-chemical characterization, thus opening the way to in-depth studies of heterogeneous catalysts by operando microscopy.
Document type :
Theses
Liste complète des métadonnées

Cited literature [214 references]  Display  Hide  Download

https://tel.archives-ouvertes.fr/tel-01705178
Contributor : Abes Star <>
Submitted on : Thursday, June 7, 2018 - 2:21:05 PM
Last modification on : Friday, October 19, 2018 - 11:46:41 AM
Document(s) archivé(s) le : Friday, May 4, 2018 - 12:01:08 AM

File

DEMBELE_Kassioge_2017_ED182.pd...
Version validated by the jury (STAR)

Identifiers

  • HAL Id : tel-01705178, version 1

Collections

Citation

Kassiogé Dembélé. Etude des catalyseurs hétérogènes à base de Co en conditions réactives "réalistes" par microscopie électronique in-situ et opérando. Physique [physics]. Université de Strasbourg, 2017. Français. ⟨NNT : 2017STRAE008⟩. ⟨tel-01705178⟩

Share

Metrics

Record views

364

Files downloads

241