Direct Synthesis of Dimethyl Ether ..

Bhattacharyya,
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Direct synthesis of dimethyl ether from syngas ..



World production today is primarily by means of methanol dehydration, but DME can also be manufactured directly from synthesis gas produced by the gasification of coal or biomass, or through natural gas reforming.

and Yun, Y., 'Synthesis of Dimethyl Ether from Syngas Obtained by Coal Gasification,' Korean J.
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Pilot-Scale Tests of Direct Dimethyl Ether Synthesis …

AB - Dimethyl ether (DME) has garnered considerable worldwide attention as a clean and environmentally benign fuel and a feedstock for production of petrochemicals and various other hydrocarbon fuels. In this work, two different strategies for the preparation of active dimethyl ether catalysts are evaluated using CuO-ZnO-Al2O3 and SiO2-Al2O3 as methanol synthesis and methanol dehydration catalysts components, respectively. Composite catalysts are prepared by mixing of the two freshly precipitated catalyst precursors and by co-precipitation methods whereas hybrid catalysts are prepared by mechanical mixing of the two calcined catalyst components by grinding. Composite catalysts are partially deactivated during the catalyst preparation or calcination stages and therefore exhibit much lower activity as compared to the hybrid catalysts towards syngas conversions.

W., 'Direct Synthesis of Dimethyl Ether in a Fixed Bed Reactor,' Energy Engg.
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N2 - Dimethyl ether (DME) has garnered considerable worldwide attention as a clean and environmentally benign fuel and a feedstock for production of petrochemicals and various other hydrocarbon fuels. In this work, two different strategies for the preparation of active dimethyl ether catalysts are evaluated using CuO-ZnO-Al2O3 and SiO2-Al2O3 as methanol synthesis and methanol dehydration catalysts components, respectively. Composite catalysts are prepared by mixing of the two freshly precipitated catalyst precursors and by co-precipitation methods whereas hybrid catalysts are prepared by mechanical mixing of the two calcined catalyst components by grinding. Composite catalysts are partially deactivated during the catalyst preparation or calcination stages and therefore exhibit much lower activity as compared to the hybrid catalysts towards syngas conversions.

and Bilbao, J., 'Deactivation and Regeneration of Hybrid Catalysts in the Single-step Synthesis of Dimethyl Ether from Syngas and ', Catal.
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Direct dimethyl ether (DME) synthesis through a …

and Lu, G., 'The Direct Synthesis of Dimethyl Ether from Syngas Over Hybrid Catalysts With Sulfate-modified -Alumina as Methanol Dehydration Components,' J.

synthesis of dimethyl ether (DME) from syngas under ..

The direct synthesis of dimethyl ether (DME) from syngas was carried out over the prepared hybrid catalysts under pressurized fixed-bed continuous flow conditions.

for synthesis of dimethyl ether (DME) ..

AB - The Cu/ZnO/Al2O3 catalysts with 13.0 and 30.6 m2Cu/g were designated as HM (highly active catalysts for methanol synthesis) and LM (low active catalysts for methanol synthesis), respectively. γ-Al2O3 and η-Al2O3 were designated as LD (low active catalysts for methanol dehydration) and HD (highly active catalysts for methanol dehydration), respectively. Four catalytic systems (LMLD, LMHD, HMLD, and HMHD) were prepared by admixing methanol synthesis catalysts and methanol dehydration catalysts. The syngas to dimethyl ether (DME) (STD) reaction was conducted at a GHSV of 6000 mL/gcat/h, 42 atm, and 250 °C. The activity of LMLD was almost same as that of LMDH, indicating that the activity of solid acid catalysts did not influence the STD reaction on the admixed catalysts using LM. On the other hand, the activity of HMHD was much higher than that of HMLD, indicating that the solid acid catalysts controlled the STD reaction on the admixed catalysts using HM.

the direct synthesis of DME from syngas ..

N2 - The Cu/ZnO/Al2O3 catalysts with 13.0 and 30.6 m2Cu/g were designated as HM (highly active catalysts for methanol synthesis) and LM (low active catalysts for methanol synthesis), respectively. γ-Al2O3 and η-Al2O3 were designated as LD (low active catalysts for methanol dehydration) and HD (highly active catalysts for methanol dehydration), respectively. Four catalytic systems (LMLD, LMHD, HMLD, and HMHD) were prepared by admixing methanol synthesis catalysts and methanol dehydration catalysts. The syngas to dimethyl ether (DME) (STD) reaction was conducted at a GHSV of 6000 mL/gcat/h, 42 atm, and 250 °C. The activity of LMLD was almost same as that of LMDH, indicating that the activity of solid acid catalysts did not influence the STD reaction on the admixed catalysts using LM. On the other hand, the activity of HMHD was much higher than that of HMLD, indicating that the solid acid catalysts controlled the STD reaction on the admixed catalysts using HM.

process for the direct synthesis of DME from synthesis gas ..

and Yamada, M., 'Design and Development of Cu-Zn Oxide Catalyst for Direct Dimethyl Ether Synthesis Using an Artificial Neural Network and Physicochemical Properties of Elements,' Ind.