Complex Catalysts for Direct Synthesis of Dimethyl Ether From Synthesis Gas. Part II. The Interaction of the Process Reactants and Products with the Catalyst Surfaces

2013 ◽  
Vol 872 ◽  
pp. 23-29
Author(s):  
Natalia I. Kosova ◽  
Irina A. Kurzina ◽  
Larisa N. Kurina
Keyword(s):  
Dimethyl Ether ◽  
Direct Synthesis ◽  
Temperature Programmed Desorption ◽  
Main Process ◽  
Methanol Dehydration ◽  
Mass Spectrometry Detection ◽  
Temperature Range ◽  
Temperature Programmed ◽  
Desorption Method ◽  
Synthesis Of Dimethyl Ether

The mechanism of the Н2, СО, СО2, СН3ОН, (CH3)2O interaction with the surfaces of CuO/ZnO/Al2O3and γ-Al2O3was investigated using temperature-programmed desorption method with mass spectrometry detection. It was shown that desorption of the main process components takes place in the temperature range between 373 and 673 K, which corresponds to the temperature range for catalytic studies. Methanol dehydration takes place over the surface of γ-Al2O3catalyst with formation of dimethyl ether at Тmax= 553 К, which is the optimal temperature for synthesis of dimethyl ether from CO and H2over industrial catalysts with layered loadings. The desorption energies of the gases were calculated.

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.

Complex Catalysts for Direct Synthesis of Dimethyl Ether from Synthesis Gas. Part I: Study of the Catalytic Properties

2013 ◽  
Vol 872 ◽  
pp. 15-22 ◽  
Author(s):  
Natalia I. Kosova ◽  
Pavel Musich ◽  
Irina A. Kurzina ◽  
Alexander Vosmerikov
Keyword(s):  
Dimethyl Ether ◽  
Synthesis Gas ◽  
Catalytic Properties ◽  
Direct Synthesis ◽  
Zeolite Catalysts ◽  
Methanol Dehydration ◽  
Combined Process ◽  
Catalytic Systems ◽  
Synthesis Of Dimethyl Ether

The results of the development of combined process for production of dimethyl ether (CuO/ZnO/Al2O3) and methanol dehydration (γ-Al2O3, zeolite (ZSM-5 type) with a silicate modulus (М) 20, 30, 60, 80, 100, and 200) are presented. The experiments on the influence of the catalysts loading and catalytic conditions were carried out (Р=3 MPa, Н2/СО=2, Т=553 К). It was established that the use of ZSM-5 zeolite catalysts with silicate modulus of 30 allows obtaining the yield of dimethyl ether up to 39%. It was stated that catalytic systems were stable during 180 h.

The Catalysts Synthesis Methanol for Direct Synthesis of Dimethyl Ether from Synthesis Gas

2015 ◽  
Vol 1085 ◽  
pp. 29-33
Author(s):  
Natalia I. Kosova ◽  
Olga Yu. Vodorezova ◽  
Irina A. Kurzina ◽  
Larisa N. Kurina ◽  
Veronica M. Vorobeva ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Dimethyl Ether ◽  
Synthesis Gas ◽  
Direct Synthesis ◽  
Methanol Dehydration ◽  
Zirconium Oxides ◽  
Synthesis Of Dimethyl Ether

Cuprum-zinc catalysts with chrome and zirconium additives were obtained by continuous codeposition within this study. XRD showed the presence of cuprum, zinc, chrome, and zirconium oxides phases. Catalytic activity was studied under the mixed loading with HZSM-5 zeolite as a catalyst for methanol dehydration during the STD-process reaction. TPR method was used to show that the reduction of catalysts takes place up to 350 °С. The maximum СО conversion value for sample CuZnAl amounts to 60 %, for sample CuZnAlСr - 83 %, and for sample CuZnAlZr it is 68 %. DME yield amounted to 18 % at a temperature of 240 °С for sample CuZnAl, for CuZnAlZr – 15 % (Т=240 °С), and for CuZnAl – 11 % at 220 °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
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