Quantitative ISS/XPS measurements on HDS catalysts

Abstract

ISS and XPS spectra were obtained for hydrodesulfurization (HDS) catalysts made by two different preparative methods. Quantitative XPS measurements were used with ISS depth profiles to demonstrate that quantitative ISS data could be obtained despite the irregular structure of catalyst surfaces. Atomic compositions as a function of depth were then obtained by (1) use of ISS data directly or (2) by XPS formalism using a non‐constant depth distribution.