Detection of low temperature oxidation of coal on a microscopic scale using secondary ion mass spectrometry

XPS was used to determine the surface concentrations of different elements present in two Spanish brown coals.Sputtering with Ar' ions followed by XPS analysis permitted depth concentration profiles in both, fresh and oxidized coals, to be obtained, and show that aerial oxidation brought about a redispersion of the organic matter onto the mineral phase. Analysis of C 1s band shape together with Fourier transform infrared (FTIR) study of organic functional groups show that loss of hydroxyl groups from the organic phase occurs by thermal decomposition during the first stages of oxidation, leading to an increase of the hydroxyl groups in the mineral phase by proton transfer. At higher temperatures, oxidation gives rise to formation of new carboxyl groups. The usefulness of XPS and some bulk characterization techniques used for studying coal oxidation is compared.

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XPS characterization of coal surfaces: Study of aerial oxidation of brown coals

González-Elipe

Martı́nez-Alonso

Tascón

1988

Surface & Interface Analysis

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SIMS study on 18O2-gasification of Ca-loaded graphite

Martin

Kyotani

Hayashi

et al. 1991

Carbon

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Secondary ion mass spectrometry in the study of froth flotation of coal fines

Martin

Bushby

1990

Fuel

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Detection of low temperature oxidation of coal on a microscopic scale using secondary ion mass spectrometry

Cited by 6 publications

References 12 publications

XPS characterization of coal surfaces: Study of aerial oxidation of brown coals

XPS characterization of coal surfaces: Study of aerial oxidation of brown coals

SIMS study on 18O2-gasification of Ca-loaded graphite

Secondary ion mass spectrometry in the study of froth flotation of coal fines

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