Ammoxidation of propylene over SnO2?Sb2O4 mixed oxide catalysts doped with Ga, In or Tl

In studying the catalytic activities of SnO₂–Sb₂O₄ (SnSb=11) mixed oxides doped with Ga, In or Tl in the ammoxidation of propylene, a selectivity improvement was observed when the dopants Ga₂O₃ and Tl₂O₃ were used in low concentrations. At higher concentrations and for In₂O₃ the characteristics of the dopant prevail, disclosing that the admixed oxides are not evenly distributed in the bulk, but that the doping is rather confined to the surface layers of the catalyst.

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, Ga, In Tl 673 . , Ga₂O₃ Tl₂O₃ (0,5–2 . %). In₂O₃ . , , .