Skip to Main content Skip to Navigation
Theses

Rationalisation de l'étape d'imprégnation de catalyseurs à base d'hétéropolyanions de molybdène supportés sur alumine

Abstract : Impregnation, crucial step of the preparation of supported catalysts used for hydrotreatment of petroleum fractions (CoMo / gamma-alumina), has been studied in this work. The main aim has consisted in determining the physico-chemical phenomena and the interactions between the support surface and the aqueous species during this step, and then linking these results to the activity of the final catalyst.The direct formation and stability of the (3 Co2+ ; H4Co2Mo10O386-) solution have been studied as a function of pH, concentration and Co/Mo ratio. This has required the developement of analytical quantitative methods (Raman and UV-visible spectroscopies) carried out thanks to SIMPLISMA, an algorithm of data treatment by factorial analysis. The study of impregnating (3 Co2+ ; H4Co2Mo10O386-) solutions onto gamma alumina has led to a best understanding of this step. It was showed that the conservation of these species on the support mainly depends on the surface density of molybdenum atoms per square nanometer, but also on the Co/Mo ratio and the initial pH of impregnating solutions, all these parameters being linked together. This study has underlined the major role of the surface properties of the support. The interest of using (3 Co2+ ; H4Co2Mo10O386-) solutions to prepare such catalysts lies in the proximity of cobalt and molybdenum. The resulting active phase is very well dispersed and highly promoted, even if the precursor is decomposed on the support during impregnation. Finally, the methodology developed in this work is transferable to the preparation of any supported catalyst.
Document type :
Theses
Complete list of metadatas

Cited literature [120 references]  Display  Hide  Download

https://tel.archives-ouvertes.fr/tel-00865838
Contributor : Abes Star :  Contact
Submitted on : Wednesday, September 25, 2013 - 11:02:13 AM
Last modification on : Thursday, November 19, 2020 - 3:15:24 AM
Long-term archiving on: : Thursday, December 26, 2013 - 4:18:08 AM

File

TH2012_Moreau_Jonathan.pdf
Version validated by the jury (STAR)

Identifiers

  • HAL Id : tel-00865838, version 1

Citation

Jonathan Moreau. Rationalisation de l'étape d'imprégnation de catalyseurs à base d'hétéropolyanions de molybdène supportés sur alumine. Autre. Université Claude Bernard - Lyon I, 2012. Français. ⟨NNT : 2012LYO10044⟩. ⟨tel-00865838⟩

Share

Metrics

Record views

822

Files downloads

14883