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

ÇELİK G., Arinan A., Bayat A., Ozbelge H. O., DOĞU T., VARIŞLI D.

TOPICS IN CATALYSIS, cilt.56, ss.1764-1774, 2013 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 56
  • Basım Tarihi: 2013
  • Doi Numarası: 10.1007/s11244-013-0112-4
  • Dergi Adı: TOPICS IN CATALYSIS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.1764-1774
  • Anahtar Kelimeler: Dimethyl ether, Syngas, Bi-functional catalyst, Heteropolyacid, Diesel fuel, DME SYNTHESIS, METHANOL DEHYDRATION, HYBRID CATALYSTS, SHIFT REACTION, SYNTHESIS GAS, HYDROGENATION, KINETICS, DEACTIVATION, ALUMINA, CU/ZNO/AL2O3
  • Gazi Üniversitesi Adresli: Evet

Özet

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 gamma-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 A degrees 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.