Dimethyl ether synthesis over novel mesoporous catalysts

Tokay, Kenan Cem
Due to overconsumption, fossil reserves are rapidly being depleted and various sources predict that they will not last until the end of 21st century. Moreover, the increase in the rate of global warming and the polluting matter emitted by the vehicles consuming fossil fuels has increased the search for renewable and clean energy sources. Alcohols and ethers, which contain fewer pollutants and have better burning properties, are commonly thought among clean fuel alternatives. Among the potential clean energy sources, dimethyl-ether is already in use in the automotive industries of many countries such as China and Japan, due to its low NOx and CO2 emissions, high cetane rating and efficient combustion characteristics, especially in diesel engines. In this work, dimethyl-ether synthesis is achieved using methanol dehydration reaction over solid acid catalysts. For this purpose, three different mesoporous MCM-41 type aluminum silicates have been synthesized with direct hydrothermal synthesis method and aluminum is added to the synthesized SBA-15 catalyst using impregnation method. Apart from the catalysts synthesized, different commercial catalysts such as aluminum oxide in different forms (α and γ), Nafion NR-50 and Nafion SAC-13 have also been tested in this reaction.


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Gündüz, Seval; Doğu, Timur; Department of Chemical Engineering (2011)
The interest in hydrogen as a clean energy source has increased due to depletion of limited fossil resources and environmental impact related to CO2 emissions. Hydrogen production from bio-ethanol, which already contains large amount of water, by steam reforming reaction, has shown excellent potential with CO2 neutrality. However, steam reforming of ethanol reaction is a highly complex process including many side reactions which decrease hydrogen yield and have a negative effect on process economy. Also, th...
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Özdoğan, Ekin; Doğu, Timur; Department of Chemical Engineering (2007)
The world’s being alerted to the global warming danger and the depletion of fossil fuel resources, has increased the importance of the clean and renewable hydrogen energy. Bioethanol has high potential to be used as a resource of hydrogen since it is a non-petroleum feedstock and it is able to produce hydrogen rich mixture by steam reforming reactions. Discovery of mesoporous MCM-41 type high surface area silicate-structured materials with narrow pore size distributions (20-100 Å) and high surface areas (up...
Nanocomposite nafion and heteropolyacid incorporated mesoporous catalysts for dimethyl ether synthesis from methanol
Çiftçi, Ayşegül; Doğu, Timur; Department of Chemical Engineering (2009)
The need for alternative transportation fuels is rising with the rapid depletion of oil reserves and the simultaneous growth of the world’s population. Production of dimethyl ether, a non-petroleum derived attractive fuel-alternate for the future, is a challenging research area. Different routes and various solid-acid catalysts are being developed in order to achieve the most efficient way of synthesizing this potential diesel alternative fuel. The focus of heterogeneous catalysis is to convert renewable fe...
Direct synthesis of dimethyl ether (dme) from synthesis gas using novel catalysts
Arınan, Ayça; Varışlı, Dilek; Department of Chemical Engineering (2010)
Increasing prices of crude oil derived transportation fuels ascended the researches on seeking alternative fuels, in last decades. Moreover, the increasing rate of global warming, because of high greenhouse gas emissions initiated new research for environment-friendly clean alternative fuels. Due to its low NOx emission, good burning characteristics and high cetane number, dimethyl ether (DME) attracted major attention as a transportation fuel alternative. Two possible pathways have been proposed for DME pr...
Dehydration of alcohol solutions obtained from a solvent recovery process by pervaporation
Büküşoğlu, Emre; Yılmaz, Levent; Department of Chemical Engineering (2010)
Solvent recovery is gaining importance in the chemical production processes to reduce the costs and because of environmental concerns. Therefore separation schemes for recovery and recycle of solvents used in printing and packaging industry were developed. However, a low value by-product, mainly ethyl alcohol and isopropanol, is obtained during the solvent recovery process. If the water concentration of this mixture is decreased below 0.1% by weight, the value of it increases significantly. To dehydrate thi...
Citation Formats
K. C. Tokay, “Dimethyl ether synthesis over novel mesoporous catalysts,” M.S. - Master of Science, Middle East Technical University, 2008.