Abstract
Dehydration of methanol into dimethyl ether (DME) was carried out over aluminum oxides with different crystalline phases, viz. η-Al2O3, γ-Al2O3, θ-Al2O3, (χ + γ)-Al2O3, δ-Al2O3, α-Al2O3, and κ-Al2O3. The catalytic activity decreased in the following order: η-Al2O3 > γ-Al2O3 ≫ θ-Al2O3 ≫ (χ + γ)-Al2O3 ≫ δ-Al2O3 > α-Al2O3 ≈ κ-Al2O3. Several techniques: N2 physisorption, X-ray diffraction (XRD), temperature-programmed desorption (TPD) of NH3, and FT-IR spectroscopy after pyridine adsorption were employed to characterize these solid acid catalysts. The good correlation can be found between the catalytic activity and the amount of Lewis acid site determined by the FT-IR spectra after pyridine adsorption.
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