Direct Synthesis of Dimethyl Ether from Carbon Dioxide

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Taher Aslani, Mohammad Reza | 2009

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 39027 (06)
University: Sharif University of Technology
Department: Chemical and Petroleum Engineering
Advisor(s): Kazemeini, Mohammad; Aghaziarati, Mahmoud; Kazemian, Masoud
Abstract:
In this research, direct synthesis of dimethyl ether (DME) from CO2 hydrogenation in three phase slurry reactor was investigated. Bifunctional catalysts composed of Cu- ZnO-Al2O3-ZrO2 as hydrogenation component and zeolite Na-Mordenite as dehydration component, with different Al2O3 and ZrO2 contents were synthesized by coprecipitating sedimentation and influences of Al2O3 and ZrO2 on CO2 conversion and DME selectivity were evaluated. Results show, both Al2O3 and ZrO2 enhanced conversion, but Al2O3 markedly increase selectivity of DME. However, when the total contents of Al2O3 and ZrO2 was increased up to 16 wt% , CO2 conversion and DME selectivity remarkably decreased. BET and XRD analyzes confirm these results and indicate, Al2O3 containing catalyst has more surface area and dispersion in comparison with ZrO2 containing catalyst
Keywords:
Dimethyl Ether ; Carbon Dioxide ; Bifunctional Catalyst ; Hydrogenation ; Aluminum Oxide Effect

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