Quantitative Surface Analysis by Xps (X-Ray Photoelectron Spectroscopy): Application to Hydrotreating Catalysts

Abstract

Résumé -Analyse quantitative de surface par XPS (X-ray photoelectron spectroscopy) : application aux catalyseurs d'hydrotraitement -La spectroscopie XPS est une technique de choix pour fournir la composition chimique de l'extrême surface de matériaux solides, très appliquée à l'étude des catalyseurs. Dans cet article, nous montrons qu'une approche quantitative basée sur l'expression fondamentale du signal XPS a permis d'obtenir un jeu cohérent de facteurs de réponse pour tous les éléments du tableau périodique. Un travail de fond a été nécessaire pour connaître de façon précise la fonction de transmission du spectromètre utilisé à l'IFP. Abstract -Quantitative Surface Analysis by XPS (X-Ray Photoelectron Spectroscopy): Application to Hydrotreating Catalysts -XPS is an ideal technique to provide the chemical composition of the extreme

Promising performance of chemically exfoliated Zr-doped MoS2 nanosheets for catalytic and antibacterial applications

“…8d, Mo 3d spectra veried various oxidation states of Mo atoms as Mo 4+ , Mo 5+ and Mo 6+ . 61 Mo 3d 5/2 and Mo 3d 3/2 binding energies indicate different oxidative states of Mo ions in the synthesized material. 62 To assess the potential of Zr-doped MoS 2 nanosheets, MB was used as contaminant to determine the catalytic activity in environmental remediation process.…”

XPS study of oxidation of rhenium metal on ?-Al2O3 support

“…It should be admitted that the relative accuracy of such quantitative analysis is about 20%, which according to Ref. [50] is quite acceptable for the chemical analysis of the extreme surface. Especially, estimation of the distribution of oxidation states of the rhenium in the low-loaded catalyst bears relatively large uncertainty.…”

Quantification of the sulfidation extent of Mo in CoMo HDS catalyst through XPS

“…Moreover, assessment of the stoichiometry has barely been reported. To our knowledge, only one publication has been devoted to this issue [14]. However, the background was not addressed considering their different origin and the method used in that work involves the use of reference samples, which in practical data acquisition are not usually available.…”