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Keywords:

  • chemical vapor deposition;
  • iron;
  • molybdenum;
  • metastable compounds;
  • oxidation
Thumbnail image of graphical abstract

An MO for Mo: β-MoO3/α-Fe2O3 catalysts synthesized by chemical vapor deposition exhibit a uniform shell–core structure. The structure of the metastable β-MoO3 film is retained even after calcination in air at 873 K, owing to strong Mo[BOND]O[BOND]Fe links at the interface. The shell–core β-MoO3/α-Fe2O3 catalysts are much more active than, and comparably selective to, the reference α-MoO3 catalyst in the selective oxidation of methanol to formaldehyde.