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A Time‐Resolved In Situ Quick‐XAS Investigation of Thermal Activation of Fischer–Tropsch Silica‐Supported Cobalt Catalysts
Author(s) -
Hong Jingping,
Marceau Eric,
Khodakov Andrei Y.,
GribovalConstant Anne,
La Fontaine Camille,
Briois Valérie
Publication year - 2012
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201103509
Subject(s) - cobalt , x ray absorption spectroscopy , fischer–tropsch process , catalysis , cobalt oxide , decomposition , thermal decomposition , absorption spectroscopy , oxide , metal , inorganic chemistry , dispersion (optics) , chemistry , materials science , metallurgy , organic chemistry , optics , physics , selectivity
Quick X‐ray absorption spectroscopy (XAS) provides quantitative information about the composition of supported metal phases during catalyst activation. Decomposition of SiO 2 ‐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).