Imaging of alumina supports by laser-induced breakdown spectroscopy: A new tool to understand the diffusion of trace metal impurities - Archive ouverte HAL Access content directly
Journal Articles Chinese Journal of Catalysis Year : 2018

Imaging of alumina supports by laser-induced breakdown spectroscopy: A new tool to understand the diffusion of trace metal impurities

(1) , (2) , (2) , (2) , (2) , (2) , (2) , (3) , (4)
1
2
3
4

Abstract

Imaging the distribution of reactive molecules in an internal diffusion-limited catalyst is of primary importance in the comprehension and modeling of these systems. Mesoporous alumina supports were impregnated with asphaltenes in a self-pressurized autoclave at high pressure (5 MPa) and high temperature (523 K). Extrudates were then analyzed by laser-induced breakdown spectroscopy (LIBS). We showed that LIBS can provide quantitative concentration maps of sulfur , nickel and vanadium in the ppm range. Processing of these maps is proposed to obtain one-dimensional profiles of the penetration of these elements. These profiles show that the penetration of asphaltenes into the catalyst support is a very complex process. These findings contribute to improving the comprehension of internal diffusion-limited processes, particularly the hy-drodemetallization (HDM) process of oil residues. This report also indicates that LIBS-based 2 imaging represents a powerful tool for quickly providing two-dimensional elemental maps over a large dynamic range, i.e., typically from ppm to tens of %, thereby opening up opportunities for innumerable applications in the field of catalysis.
Fichier principal
Vignette du fichier
LIBS_Imaging_Asphaltenes.pdf (643.24 Ko) Télécharger le fichier
Vignette du fichier
Imaging of alumina sup materials 2.pdf (85.36 Ko) Télécharger le fichier
Origin : Files produced by the author(s)

Dates and versions

hal-01978484 , version 1 (11-01-2019)

Identifiers

Cite

Florian Trichard, Florine Gaulier, Jérémie Barbier, Didier Espinat, Bertrand Guichard, et al.. Imaging of alumina supports by laser-induced breakdown spectroscopy: A new tool to understand the diffusion of trace metal impurities. Chinese Journal of Catalysis, 2018, 363, pp.183-190. ⟨10.1016/j.jcat.2018.04.013⟩. ⟨hal-01978484⟩
58 View
122 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More