Abstract
Chlorine free mesoporous TiO 2 nanotubes (TNT) with high surface areas were prepared and used to support V 2O 5. The addition of V 2O 5 increased the surface acidity of TNT, which was further enhanced by the addition of Ti(SO 4) 2. The materials were characterized by X-ray diffraction (XRD), laser Raman spectroscopy (LRS), transmission electron microscopy (TEM), N 2 and O 2 adsorption, X-ray photoelectron spectroscopy (XPS), temperature-programmed reduction (H 2-TPR), and microcalorimetry and infrared spectroscopy (FTIR) for the adsorption of NH 3. The catalytic behavior for the selective oxidation of methanol to dimethoxymethane (DMM) was evaluated. It was found that V 2O 5 was highly dispersed on TNT with the V 2O 5 loading lower than 20 wt%. The 6% SO 4 2 − /20%V 2O 5/TNT displayed the strong surface acidic and redox characters and exhibited excellent performance for the selective oxidation of methanol to DMM. The methanol conversion reached 64% with 90% selectivity to DMM over the SO 4 2 − /20%V 2O 5/TNT at 403 K.
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