Abstract
Abstract The impregnation of hydrated zirconia at pH ∼0.5 with a solution of peroxoniobium(V) complex, [Nb 2 (O 2 ) 3 ] 4+ , ensuring a ZrO 2 :Nb 2 O 5 mole ratio of 6:1 followed by calcination at 873 K resulted in the formation of a Zr 6 Nb 2 O 17 solid solution. The structure of this compound was confirmed by XRD. The surface acidity was investigated by in situ FT-IR spectroscopy using 2,6-dimethylpyridine (lutidine). Zr 6 Nb 2 O 17 has a sufficient amount of Bronsted acid sites necessary for the stabilization of dispersed Pd(II) species. The potential of the Pd-promoted Zr 6 Nb 2 O 17 as a catalyst for the reduction of NO with methane was evaluated by studying the reactivity of adsorbed NO x species toward the hydrocarbon.
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