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Received July 27, 2007
Accepted September 13, 2007
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Effect of pressure on direct synthesis of DME from syngas over metal-pillared ilerites and metal/metal-pillared ilerites
Department of Chemical Engineering, Myongji University, San 38-2, Namdong, Yongin, Gyeonggi-do 449-728, Korea 1Department of Chemical Engineering, Han-Seo University, 360 Daegokri, Haemi-myun, Seosansi 360-706, Korea
hahm@mju.ac.kr
Korean Journal of Chemical Engineering, May 2008, 25(3), 466-470(5), 10.1007/s11814-008-0079-1
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Abstract
The effect of pressure on the direct synthesis of dimethyl ether (DME) from syngas over metal (Cu, Zn) pillared ilerites and metal (Cu, Zn) impregnated metal-pillared ilerites was explored. The prepared catalysts were characterized by XRD, BET, ICP-AES, SEM and FT-IR. The direct DME synthesis reaction was carried out in a differential fixed bed reactor with the prepared catalysts at various pressures (10, 20, 30 bar), 250 ℃ and H2/CO ratio of 2. The Cu/Zn-pillared ilerite catalyst showed the highest catalytic activity among the prepared catalysts at 20 bar, in which CO conversion was about 62% and DME selectivity was about 89%. CO conversion increased with pressure, and DME selectivity increased with pressure in the range of 10-20 bar, and above the pressure slightly decreased with pressure. The optimum pressure for this reaction was 20 bar.
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