Dehydration of methanol to dimethyl ether over modified vermiculites |
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Institution: | 1. Faculty of Fuels and Energy, AGH, University of Science and Technology, Al. A Mickiewicza 30, 30-051 Kraków, Poland;2. CQE, Instituto Superior Tecnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal |
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Abstract: | Vermiculite materials pillared with alumina and modified with titanium were tested as catalysts for methanol dehydration to dimethyl ether. The different samples were characterized by powder XRD, TG, nitrogen adsorption, and pyridine adsorption followed by FTIR. Catalytic activity was evaluated in the temperature range 250–450 °C using different hourly space velocities, in the absence and in the presence of water in the feed. Modified vermiculites were shown to be active and selective in methanol dehydration. Al pillaring was found to result in more active catalysts than in the case of the modification with TiO2. The influence of methanol hourly space velocity did not have a significant effect on methanol conversion, but it changed drastically selectivity to dimethyl ether at the beginning of the reaction. The addition of water had a negative effect on the catalysts’ activity and led to a faster catalyst deactivation. |
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Keywords: | Vermiculites Methanol Dehydration Dimethyl ether Pillaring Vermiculites Méthanol Déshydratation Diméthyléther Empilage |
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