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Catalysts
For catalysis the
characterization of the top surface layer
of atoms is essential and the Qtac100 is the
perfect tool for this application. In this example it is
used to study sub-monolayer coverages of Te, Nb and Sb
oxides on Mo-V-O. This multi-component catalyst is used for
the conversion
of propane feedstock to acrylic acid and acrylonitrile,
intermediary chemicals for the production of clothes, home
furnishings, paints, adhesives etc. The results show the
surface composition of Mo-V-M-O (M=Te, Nb, Sb) catalysts. A
study of different surface concentrations of Te, Nb and Sb
reveals which combination gives the optimum selectivity and
reaction rates.
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Energy
spectra showing the elements present in the top atomic layer
of
a Mo-V-Te-O catalyst.
The inset shows a higher resolution spectrum acquired using
neon instead of helium ion scattering.
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