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Performance of Silicotungstic Acid Incorporated Mesoporous Catalyst in Direct Synthesis of Dimethyl Ether from Syngas in the Presence and Absence of CO2

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Abstract

Dimethyl ether (DME), which is an excellent green diesel fuel alternate, is synthesized following a direct synthesis route from synthesis gas, by using a bi-functional catalyst mixture, which was composed of a silicotungstic acid incorporated mesoporous catalyst [TRC-75(L)] and a commercial Cu–Zn based catalyst. Higher DME selectivity values were obtained by using TRC-75(L), than commercial γ-alumina at 50 bars. Presence of CO2 in the feed stream caused significant enhancement in DME selectivity. Results showed that DME selectivity of about 0.85 was obtained in a temperature range 250–275 °C in the presence of 10 % CO2. In fact, CO2 was also used as a resource to produce DME at lower temperatures. Reverse dry reforming and ethanol formation reactions were observed as side reactions, especially at higher temperatures. Results also proved that direct synthesis of DME from syngas has major CO conversion and DME selectivity advantages over the two step process involving consecutive methanol synthesis and dehydration steps.

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Acknowledgments

Financial support of TUBITAK (The Scientific and Technological Research Council of Turkey) through 108M571 project, Middle East Technical University funds and valuable contributions of Dr. Gulsen Dogu and Seval Gunduz are gratefully acknowledged. TOYO company is also acknowledged for supplying γ-alumina.

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Authors and Affiliations

  1. Middle East Technical University, 06800, Ankara, Turkey

    Gokhan Celik, Ayca Arinan, Aysegul Bayat, H. Onder Ozbelge & Timur Dogu

  2. Gazi University, 06500, Ankara, Turkey

    Dilek Varisli

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  1. Gokhan Celik
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  2. Ayca Arinan
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  3. Aysegul Bayat
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  4. H. Onder Ozbelge
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  5. Timur Dogu
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  6. Dilek Varisli
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Correspondence to Timur Dogu.

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Celik, G., Arinan, A., Bayat, A. et al. Performance of Silicotungstic Acid Incorporated Mesoporous Catalyst in Direct Synthesis of Dimethyl Ether from Syngas in the Presence and Absence of CO2 . Top Catal 56, 1764–1774 (2013). https://doi.org/10.1007/s11244-013-0112-4

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