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Quick X-ray absorption spectroscopy (XAS) provides quantitative information about the composition of supported metal phases during catalyst activation. Decomposition of SiO2-supported cobalt nitrate in diluted NO leads to the rapid formation of cobalt(II) hydroxynitrates below 100 °C. Their decomposition starts progressively between 110 and 170 °C to give cobalt oxide nuclei, which contribute to the enhancement of the metal oxide dispersion (see figure).
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Hong et al. (2012) studied this question.
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