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Abstract
We have shown that Auger electron spectroscopy can be used to monitor the concentration of calcium in carbon based systems and have further demonstrated that additional chemical information about the electronic environment of calcium can be obtained from the relative amplitudes of the calcium L 23 M 23 M 23 and L 23 M 23 N 1 Auger transitions. Examples of CaO by itself and with carbon powders, CaCO 3 on carbon, and a Ca 2+ ion-exchanged impregnated carbon are given. The average electronic environment of calcium following CaCO 3 decomposition on carbon is more metallic-like than the parent salt. Thermally activated Ca 2+ ion-exchanged impregnated carbon, an active gasification catalyst precursor, shows similar electronic properties.
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