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Keywords:

  • Catalysis;
  • Selective Oxidation;
  • Silver;
  • Solid Phases;
  • Vanadium

Abstract

Catalysts based on silver vanadium phosphates with a general chemical formula Ag2VPxOd (1 ≤ x ≤ 2; 6 ≤ d ≤ 8) have been prepared and tested in gas phase oxidation of n-butane. This general chemical formula comprises the two known phosphates Ag2(VVO2)PO4 (x = 1; d = 6) and Ag2(VIVO)P2O7 (x = 2; d = 8) and one novel compound with an approximate composition Ag2VIV,VP1.6O7+δ (0 ≤ δ ≤ 0.5). Among the prepared compounds, Ag2(VVO2)PO4 shows the highest activity while Ag2(VIVO)P2O7 is completely inactive. The novel phase Ag2VIV,VP1.6O7+δ (0 ≤ δ ≤ 0.5) is the only compound with selectivity to maleic anhydride. A structure-property relationship for the prepared catalysts is discussed.