scholarly journals Direct catalytic production of dimethyl ether from CO and CO2: A review

2021 ◽  
Vol 1 (2) ◽  
pp. 105-125
Author(s):  
Asieh Akhoondi ◽  
Ahmed I. Osman ◽  
Ali Alizadeh Eslami
Keyword(s):  
Dimethyl Ether ◽  
Energy Demand ◽  
Direct Synthesis ◽  
Cetane Number ◽  
Industrial Process ◽  
Operating Conditions ◽  
Total Capital ◽  
Bio Oil ◽  
Green Fuel ◽  
Synthesis Of Dimethyl Ether

Dimethyl ether (DME) is a synthetically produced alternative fuel to diesel-based fuel and could be used in ignition diesel engines due to increasing energy demand. DME is considered extremely clean transportation and green fuel because it has a high cetane number (around 60), low boiling point (−25 °C), and high oxygen amount (35 wt%) which allow fast evaporation and higher combustion quality (smoke-free operation and 90% fewer NOx emissions) than other alternative CO2-based fuels. DME can be synthesized from various routes such as coal, petroleum, and bio-based material (i.e., biomass and bio-oil). Dimethyl ether can be produced from CO2 to prevent greenhouse gas emissions. This review aims to summarize recent progress in the field of innovative catalysts for the direct synthesis of dimethyl ether from syngas (CO+H2) and operating conditions. The problems of this process have been raised based on the yield and selectivity of dimethyl ether. However, regardless of how syngas is produced, the estimated total capital and operating costs in the industrial process depend on the type of reactor and the separation method.

Determination of the Optimum Operating Conditions for Direct Synthesis of Dimethyl Ether from Syngas

2007 ◽  
Vol 5 (1) ◽  
Author(s):  
Gholam Reza Moradi ◽  
Rohollah Ghanei ◽  
Fereydoon Yaripour
Keyword(s):  
Dimethyl Ether ◽  
Synthesis Gas ◽  
Direct Synthesis ◽  
Weight Ratio ◽  
Space Velocity ◽  
Bifunctional Catalyst ◽  
Single Step ◽  
Operating Conditions ◽  
Optimum Operating ◽  
Synthesis Of Dimethyl Ether

The optimum operating conditions of a single – step synthesis of dimethyl ether (DME) from synthesis gas has been determined. The bifunctional catalyst has been prepared by physically mixing of a commercial methanol catalyst (KMT Co.) and a dehydration catalyst (H-MF-90) which has been characterized by XRD, XRF and BET techniques. Catalytic synthesis of dimethyl ether from synthesis gas was evaluated in agitated slurry micro reactor in different ranges of operating conditions which were determined by experimental design according to Taguchi algorithm. The range of operating conditions were chosen as follows: H2/CO mole ratio in feed varying from 0.26 to 1.5, the pressure varying from 10 to 50 bar, the temperature varying from 200 to 240 ºC and weight ratio of methanol catalyst to dehydration catalyst from 0.67 to 4. The experiments have been conducted for different operating conditions at fixed impeller speed equal to 1600rpm and space velocity equal to 500 ml/gcat.h. Considering the results of experiments, optimum conditions for direct synthesis of DME were predicted as follows: T=240 ºC, P=33.3 Bar, H2/CO=1.5 and weight ratio of methanol catalyst to dehydration catalyst equal to 3.

scholarly journals Temperature-programmed surface reactions of methanol and dimethyl ether on bifunctional catalysts for the direct synthesis of dimethyl ether from syngas

2018 ◽  
Vol 243 ◽  
pp. 00002
Author(s):  
Olga Vodorezova ◽  
Pavel Musich ◽  
Natalia Karakchieva ◽  
Lothar Heinrich ◽  
Irina Kurzina
Keyword(s):  
Dimethyl Ether ◽  
Direct Synthesis ◽  
Bifunctional Catalyst ◽  
Bifunctional Catalysts ◽  
X Ray Diffraction ◽  
X Ray ◽  
Physical Mixing ◽  
Stage Synthesis ◽  
Temperature Programmed ◽  
Synthesis Of Dimethyl Ether

Dimethyl ether (DME) can be used as a replacement for diesel fuel in transportation. The catalytic effectiveness of bifunctional catalysts for DME one-stage synthesis from carbon monoxide and hydrogen was estimated in the paper. Bifunctional catalysts CuZnAl/HZSM-5, CuZnAlCr/HZSM-5, and CuZnAlZr/HZSM-5 were obtained by physical mixing of CuZnAl(Cr/Zr)– Ох and HZSM-5 components and were characterized by BET, X-ray diffraction, and temperatureprogrammed surface reaction methods. Based on the TPSR results, the mechanism of the interaction of methanol and DME with the surface of the bifunctional catalyst was studied. It was found that the temperature range of the greatest catalytic activity was 240–260 °С.

Structured catalysts for the direct synthesis of dimethyl ether from synthesis gas: A comparison of core@shell versus hybrid catalyst configuration

2020 ◽  
Vol 342 ◽  
pp. 46-58 ◽  
Author(s):  
Giulia Baracchini ◽  
Albert G.F. Machoke ◽  
Michael Klumpp ◽  
Ruoxi Wen ◽  
Patrick Arnold ◽  
...  
Keyword(s):  
Dimethyl Ether ◽  
Synthesis Gas ◽  
Direct Synthesis ◽  
Core Shell ◽  
Hybrid Catalyst ◽  
Structured Catalysts ◽  
Synthesis Of Dimethyl Ether

Effects of Feed Composition and Space Velocity on Direct Synthesis of Dimethyl Ether from Syngas

2008 ◽  
Vol 47 (20) ◽  
pp. 7672-7679 ◽  
Author(s):  
Gholamreza Moradi ◽  
Javad Ahmadpour ◽  
Mahdi Nazari ◽  
Ferydon Yaripour
Keyword(s):  
Dimethyl Ether ◽  
Direct Synthesis ◽  
Space Velocity ◽  
Feed Composition ◽  
Synthesis Of Dimethyl Ether
Sign in / Sign up

Export Citation Format

Share Document