Performance of modified H-ZSM-5 zeolite for dehydration of methanol to dimethyl ether |
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Authors: | Samaneh Hassanpour Majid Taghizadeh |
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Affiliation: | a Department of chemical engineering, Babol University of Technology, P.O. Box 484, 4714871167 Babol, Iran b Catalyst Research Group, Petrochemical Research and Technology Company, National Petrochemical Company, Tehran, Iran |
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Abstract: | The conversion of methanol to dimethyl ether was carried out over various commercial zeolites and modified H-ZSM-5 catalysts to evaluate their catalytic performance. A series of commercially available zeolite samples were used for vapor-phase dehydration of methanol to DME. Catalyst screening tests were performed in a fixed-bed reactor under the same operating conditions (T = 300 °С, P = 16 barg, WHSV = 3.8 h−1). It was found that all the H-form zeolite catalysts in this study were active and selective for DME synthesis. According to the experimental results MDHC-1 catalyst exhibited the highest activity in dehydration of methanol.After finding the most active catalyst, the H-MFI90 zeolite was modified with Na content varying from 0 to 120 mol%, via wet-impregnation method to further improve its selectivity. All of catalysts were characterized by BET, XRD, NH3-TPD, ICP, TGA, SEM, FT-IR and TPH techniques. It was found that these materials affected activity of MDHC-1 zeolite by changing its acidity. Ultimately, among all the catalysts studied, Na100-modified H-MFI90 zeolite exhibited optimum activity, selectivity and stability at methanol dehydration reaction. |
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Keywords: | Methanol dehydration Dimethyl ether Zeolite catalyst Surface acidity |
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