Abstract
Metal vanadates are promising catalysts for the ammoxidation of 2-methylpyrazine to 2-cyanopyrazine, an important intermediate in the production of pyrazinamide as an effective anti-tubercular drug. Low-Energy Ion Scattering (LEIS) investigations supplementing X-ray Photoelectron Spectroscopy (XPS) measurements showed the variation of the composition in the near-surface region. Only with this experimental approach it was possible to elucidate, how important are stable vanadium-enriched or pure vanadia outermost surface layers for a selective catalyst. In contrast, mixed oxide outermost layers are detrimental for the catalytic performance.
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