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Pt, Pd Supported on Niobium Phosphates as Catalysts for the Hydrogen Oxidation

Author Affiliations

  • 1Kyiv National Taras Shevchenko University, 01601 Kyiv, UKRAINE
  • 2 V.N. Bakul Institute for Superhard Materials, 04074 Kyiv, UKRAINE

Res.J.chem.sci., Volume 3, Issue (3), Pages 30-33, March,18 (2013)

Abstract

Niobium phosphates NbP2O7 and NbPO5 were synthesized by using convenient synthetic routs. The catalysts, namely, Pt or Pd metals supported on NbP2O7 and NbPO5, were prepared by the impregnation method and characterized by means of miscellaneous techniques. Activity measurements of the H oxidation reaction were performed over PGM/NbP2O7, PGM/NbPO5, and PGM/Al2O3 (PGM = Pt or Pd) catalysts, the latter were used for comparison reasons, in the gas mixture with oxygen excess (H2:O2:Ar = 1:20:79 vol.%). It was found that for catalysts with the same platinum group metal (PGM) loading of 0.5 wt. %, the catalytic activity of Pt and Pd supported on the niobium phosphates was higher than that of Pt and Pd supported on alpha-Al2O3, correspondingly. The results showed that the conversion of H is dependent on chemical nature of supports, and the activity of the catalysts decreases in the order of PGM/NbP2O7 > PGM/NbPO5 > PGM/Al2O3. The enhanced activity of Pt/NbP2O7 and Pd/NbP2O7 catalysts is attributed to the presence of Nb4+/Nb5+states in the NbP2O7. These states can promote the generation of easily reduced oxygen species, which are active in the catalytic H2 oxidation.

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