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Bifunctional catalyst for direct DME synthesis - BIBSYS

KW - DME synthesis catalyst

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Bifunctional catalyst for direct DME synthesis - CORE

Nowadays, DME is commercially produced by dehydration of methanol using acidic porous catalysts; whereas direct synthesis from synthesis gas in large-scale plants might be more economical.

The activity test for the catalysts was performed in the DME synthesis set-up.

The origin of the observed phenomena is investigated by varying dehydration catalyst and by introducing dehydration products (DME and water) into the methanol synthesis feed.

Dimethyl Ether (DME) - METHANOL INSTITUTE

On the contrary, a Pd/ZnO/Al 2 O 3 catalyst was found to be highly stable for methanol and DME synthesis at 375 °C.

AB - The activity and durability of two hybrid bifunctional dimethyl ether (DME) synthesis catalysts: 6CuO-3ZnO-Al2O3/γ-Al2O3 and 6CuO-3ZnO-1Al2O3/HZSM-5, have been evaluated for the conversion of CO2/H2 to DME at 260°C, 5MPa, and gas per hourly space velocity (GHSV) of 3000 mL gcat-1 h-1 in fixed-bed and slurry reactors. The catalyst 6CuO-3ZnO-Al2O3/γ-Al2O3 mostly promoted reverse-water-gas-shift (RWGS) reaction with very low selectivity to DME, and a low conversion of CO2. The other catalyst, 6CuO-3ZnO-1Al2O3/HZSM-5, showed much higher conversion of CO2 with higher selectivity to DME in both, fixed-bed and slurry reactors.

The MTG process first dehydrates methanol to (DME); an equilibrium mixture of methanol, DME and water is then converted to light (C2-C4). A final step synthesizes higher , n/-paraffins, aromatics and . The shape-selective catalyst limits the synthesis reactions to 10 carbons.

Homoallylic alcohol synthesis by 1,2-addition or C-C …

Appel, Role of dehydration catalyst acid properties on one-step DME synthesis over physical mixtures, Catal.

N2 - DME ynthesis from syngas via methanol has been carried out in a single-stage liquid phase reactor. Cu/ZnO/Al2O3 and γ-Al2O3 were used together as methanol synthesis catalyst and dehydration catalyst, respectively. The influence of water on the catalytic system was investigated mainly. Water affected the activity of methanol dehydration catalyst as well as methanol synthesis catalyst. Thus, removal of water from the reaction system, by adding a dehydrating agent or controlling methanol formation rate by the reaction parameters, was efficient in maintaining the high catalytic activity and stability.

AB - DME ynthesis from syngas via methanol has been carried out in a single-stage liquid phase reactor. Cu/ZnO/Al2O3 and γ-Al2O3 were used together as methanol synthesis catalyst and dehydration catalyst, respectively. The influence of water on the catalytic system was investigated mainly. Water affected the activity of methanol dehydration catalyst as well as methanol synthesis catalyst. Thus, removal of water from the reaction system, by adding a dehydrating agent or controlling methanol formation rate by the reaction parameters, was efficient in maintaining the high catalytic activity and stability.

A collection of bifunctional catalysts with different contents and additives has been studied for the direct DME synthesis.
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  • PDF Downloads : Oriental Journal of Chemistry

    Silva, The influence of different methanol synthesis catalysts on direct synthesis of DME from syngas, Catal.

  • Biomethanol: a Fuel of the Future - Chemicals Technology

    flexible and switchable synthesis between DME and methanol, (7) robust catalyst for dirty syngas

  • Cascade Catalysis for the Homogeneous Hydrogenation …

    Keywords: DME synthesis; Solid acid catalyst; Methanol synthesis; ZSM-5 1

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Methanol has a high toxicity in humans

The activity and durability of two hybrid bifunctional dimethyl ether (DME) synthesis catalysts: 6CuO-3ZnO-Al2O3/γ-Al2O3 and 6CuO-3ZnO-1Al2O3/HZSM-5, have been evaluated for the conversion of CO2/H2 to DME at 260°C, 5MPa, and gas per hourly space velocity (GHSV) of 3000 mL gcat-1 h-1 in fixed-bed and slurry reactors. The catalyst 6CuO-3ZnO-Al2O3/γ-Al2O3 mostly promoted reverse-water-gas-shift (RWGS) reaction with very low selectivity to DME, and a low conversion of CO2. The other catalyst, 6CuO-3ZnO-1Al2O3/HZSM-5, showed much higher conversion of CO2 with higher selectivity to DME in both, fixed-bed and slurry reactors.

There are largely two methods for DME synthesis

N2 - The activity and durability of two hybrid bifunctional dimethyl ether (DME) synthesis catalysts: 6CuO-3ZnO-Al2O3/γ-Al2O3 and 6CuO-3ZnO-1Al2O3/HZSM-5, have been evaluated for the conversion of CO2/H2 to DME at 260°C, 5MPa, and gas per hourly space velocity (GHSV) of 3000 mL gcat-1 h-1 in fixed-bed and slurry reactors. The catalyst 6CuO-3ZnO-Al2O3/γ-Al2O3 mostly promoted reverse-water-gas-shift (RWGS) reaction with very low selectivity to DME, and a low conversion of CO2. The other catalyst, 6CuO-3ZnO-1Al2O3/HZSM-5, showed much higher conversion of CO2 with higher selectivity to DME in both, fixed-bed and slurry reactors.

DME - Methanol synthesis | Haldor Topsoe

As dimethyl ether (DME) does not contain sulfur or ash, it does not generate any SOx or particulate matter when combusted. It is a clean fuel of high cetane number, excellent combustion characteristics and extremely low toxicity, which is not believed to cause global warming or destroy the ozone layer.
DME may be stored and handled in a similar manner to LPG, so expectations have grown for its use as an alternative to LPG and diesel. It is also considered to be an alternative clean energy that can indirectly alleviate the constraint on resources, as it can be made from a wide range of source materials besides natural gas, including coal, heavy oil, biomasses and waste. This is possible because DME is produced from syngas in its production process.
TOYO has developed indirect DME production technologies and catalysts by adding the DME synthesis process to the methanol plant. In the indirect method, methanol and DME may be produced together and production can be adjusted to suit market demand, enabling highly flexible production strategy. Also, the DME plant, which is highly reliable and easy to operate, may become an economic reality because it is underpinned by a large-scale methanol process that has already reached technological maturity. Four DME plants under license by TOYO are already under operation in China.
TOYO received 2006 Japan petroleum institute award for technological progress as “Commercialization of Indirect Method of DME Process”

DME Plant project (Final Report) - SlideShare

Al-MCM-41 catalysts were also combined with methanol synthesis catalysts to form bifunctional catalysts for the synthesis DME from CO2/H2 at temperature, 260 °C; pressure, 735 psi; GHSV, 2000 mL g-1cat h-1 in a fixed-bed reactor.

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