Curve Fitting Analysis of ESCA Ni 2p Spectra of Nickel-Oxygen Compounds and Ni/Al2O3 Catalysts

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Abstract:

Nonlinear least-squares curve fitting is used to analyze Ni 2p spectra obtained from various nickel-oxygen compounds and Ni/Al2O3 catalysts. Apart from NiO, which shows a characteristic discrete satellite peak 2 eV from the main 2p3/2 peak, all other spectra exhibit variable peak asymmetry assigned to multiplet splitting effects. By the use of a single extra peak to describe this asymmetry, the relative satellite/main peak intensity ratio can be used as an indication of the chemical state of nickel. Results for Ni/Al2O3 catalysts agree with reduction studies from previous work about the nature of nickel species on the surfaces of these catalysts at various nickel loadings.

Keywords: Catalysts; Computer applications; Spectroscopic techniques; Surface analysis

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702844554530

Affiliations: Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260

Publication date: November 1, 1984

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