Far field combined AFM and micro-Raman imaging for characterisation of surface of structured catalysts : example of Pd Doped $CoO_x$ catalysts on precalcined kanthal steel
Far field combined AFM and micro-Raman imaging for characterisation of surface of structured catalysts : example of Pd Doped $CoO_x$ catalysts on precalcined kanthal steel
Far field combined AFM and micro-Raman imaging for characterisation of surface of structured catalysts : example of Pd Doped $CoO_x$ catalysts on precalcined kanthal steel
A coupled AFM-Raman system was used to
study the surface heterogeneity of catalytic materials at
various stages of their preparation. The catalysts chosen for
the analyses were cobalt oxide with and without palladium
dopant deposited on surface of pre-calcined steel carriers.
Steel carriers are surveyed here in terms of their application
as fillers for structured reactors for the catalytic combustion
of volatile organic compounds. Upon steel precalcination
stage the interfaced AFM-Raman and in situ Raman
analyses revealed the evolution of alumina and iron oxide
phases on the surface with their final stable forms found as
being α-Al_{2}O_{3} and α-Fe_{2}O_{3}. Upon catalyst layering stage
AFM-Raman mapping evidenced uniform coverage of
precalcined steel carrier with cobalt spinel oxide Co_{3}O_{4}.
For the doped catalyst except Co_{3}O_{4}
palladium(II) oxide
grains were also found on the surface. The differences in
the composition of cobalt catalysts were correlated with the
differences in their catalytic activity.