Correlation between acidity and catalytic activity for the methanol dehydration over various aluminum oxides |
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| Authors: | Dong Min Sung Yun Ha Kim Eun Duck Park Jae Eui Yie |
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| Institution: | 1. Division of Applied Chemistry and Biological Engineering, Ajou University, San 5 Wonchun-Dong, Yeongtong-Gu, Suwon, 443-749, Republic of Korea
2. Division of Energy Systems Research and Division of Chemical Engineering and Materials Engineering, Ajou University, San 5 Wonchun-Dong, Yeongtong-Gu, Suwon, 443-749, Republic of Korea
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| 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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