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Effect of Reaction Conditions on the Catalytic Dehydration of Methanol to Dimethyl Ether Over a K-modified HZSM-5 Catalyst

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Abstract

The effect of temperature, pressure, space velocity and feed-stream water content in the synthesis of dimethyl ether from methanol over a K-HZSM-5 catalyst was evaluated with respect to the activity, physicochemical properties and deactivation of the catalyst. Increasing the water content in the feed stream allowed to proceed the reaction over a wider temperature range. Despite a decrease in the methanol conversion at low temperatures (<250 °C), methanol conversions and dimethyl ether selectivities of more than 50 and 99%, respectively, were achieved. It was found that deactivation of the catalyst due to coke formation or dealumination occurred depending on the amount of water in the feed stream. Coke as covering the catalyst particle surface deactivates the catalyst. Aromatic compounds entrapped in the pores affect acidity, pore volume, surface area and also conversion. Although catalyst deactivation due to dealumination caused a 20% decrease in the methanol conversion, the stability of K-HZSM-5 is expected to be improved by the addition of a proper amount of water in the feed.

Graphical Abstract

MTD reaction over K-HZSM-5 at a reaction temperature of 340 °C with various LHSV-pressure-water content conditions for 300 h on stream; (red) 10-10-0, (blue) 10-10-50, (black) 20-10-50, where the three numbers correspond LHSV (h−1)-pressure (bar)-percentage of water.

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Acknowledgements

This work was supported by Korea Institute of Energy Technology Evaluation and Planning (KETEP) under “Energy Efficiency & Resources Programs” (Project No. 2012T100201578) of the Ministry of Trade, Industry and Energy, and the core KRICT project (KK1601-B00) from Korea Research Institute of Chemical Technology and C1 Gas Refinery Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning (2015M3D3A1064901). The authors would like to acknowledge Korea Basic Science Institute (KBSI) at western Seoul center for 27Al MAS NMR analysis.

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Authors and Affiliations

  1. Carbon Resources Institute, C1 Gas Conversion Research Group, Korea Research Institute of Chemical Technology (KRICT), P.O. Box 107, Gajeongro 141, Yuseong, Daejeon, 34114, South Korea

    Sungtak Kim, Yong Tae Kim, Chundong Zhang, Geunjae Kwak & Ki-Won Jun

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  1. Sungtak Kim
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  2. Yong Tae Kim
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Correspondence to Ki-Won Jun.

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Kim, S., Kim, Y.T., Zhang, C. et al. Effect of Reaction Conditions on the Catalytic Dehydration of Methanol to Dimethyl Ether Over a K-modified HZSM-5 Catalyst. Catal Lett 147, 792–801 (2017). https://doi.org/10.1007/s10562-017-1981-0

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  • DOI: https://doi.org/10.1007/s10562-017-1981-0

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