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Copper oxide and niobium pentoxide were supported on silica–alumina with 2, 5, 10, 15 and 25 mass% loadings and 1:1 mass ratio of CuO:Nb2O5. XRD and BET measurements confirmed that monolayer coverage is reached with loadings between 5–10 mass% (∼308 m2 g−1). The DRIFTS spectra of pyridine adsorbed catalysts showed bands associated with Brnsted, Lewis and a combination of both acidic sites. Thermal analysis and liquid phase microcalorimetry provided the parameters for the best catalyst (10 mass%), which has the highest number of acidic sites (0.38 mmol g−1) and enthalpies of interaction with pyridine for Brnsted and Lewis sites (ΔH1 = −107.5 and ΔH2 = −64.4 kJ mol−1, respectively).

Acidic Characterization of Copper Oxide and Niobium Pentoxide Supported on Silica–Alumina