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The M1 phases of the Mo–V–Te–Nb mixed-metal oxides are highly promising catalysts for direct propane (amm)oxidation. Nb is beneficial to the activity and selectivity for acrylonitrile, but direct evidence for Nb location is lacking because structural methods cannot distinguish Nb (Z=41) from Mo (Z=42). We have employed high-angle annular dark-field (HAADF) scanning transmission electron microscopy...
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