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.

scholarly journals Supported Intermetallic PdZn Nanoparticles as Bifunctional Catalysts for the Direct Synthesis of Dimethyl Ether from CO‐Rich Synthesis Gas

2019 ◽  
Vol 58 (44) ◽  
pp. 15655-15659 ◽  
Author(s):  
Manuel Gentzen ◽  
Dmitry E. Doronkin ◽  
Thomas L. Sheppard ◽  
Anna Zimina ◽  
Haisheng Li ◽  
...  
Keyword(s):  
Dimethyl Ether ◽  
Synthesis Gas ◽  
Direct Synthesis ◽  
Bifunctional Catalysts ◽  
Pdzn Nanoparticles ◽  
Synthesis Of Dimethyl Ether

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.

LDH-Derived (CuZn)xAly Bifunctional Catalyst for Direct Synthesis of Dimethyl Ether from Syngas

2020 ◽  
Vol 59 (23) ◽  
pp. 11087-11097 ◽  
Author(s):  
Sha Tian ◽  
Minghui Tan ◽  
Qingxiang Ma ◽  
Xuemei Wu ◽  
Chunhui Luan ◽  
...  
Keyword(s):  
Dimethyl Ether ◽  
Direct Synthesis ◽  
Bifunctional Catalyst ◽  
Synthesis Of Dimethyl Ether

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.

Direct synthesis of dimethyl ether from syngas on CuO ZnO MnO/SAPO-18 bifunctional catalyst

2016 ◽  
Vol 41 (40) ◽  
pp. 18015-18026 ◽  
Author(s):  
Ainara Ateka ◽  
Paula Pérez-Uriarte ◽  
Miguel Sánchez-Contador ◽  
Javier Ereña ◽  
Andrés T. Aguayo ◽  
...  
Keyword(s):  
Dimethyl Ether ◽  
Direct Synthesis ◽  
Bifunctional Catalyst ◽  
Synthesis Of Dimethyl Ether

scholarly journals Enhancement of the Direct Synthesis of Dimethyl Ether (DME) from Synthesis Gas by Macro- and Microstructuring of the Catalytic Bed

Catalysts ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 852
Author(s):  
Katarzyna Bizon ◽  
Krzysztof Skrzypek-Markiewicz ◽  
Gaetano Continillo
Keyword(s):  
Dimethyl Ether ◽  
Direct Synthesis ◽  
Bifunctional Catalyst ◽  
Physical Mixture ◽  
Fixed Bed Reactor ◽  
Synthesis Process ◽  
Active Centers ◽  
Heterogeneous Model ◽  
Catalyst Pellets ◽  
Synthesis Of Dimethyl Ether

This work reports on a modelling study of the influence of the distribution of metallic and acidic active centers within a catalytic fixed-bed reactor for the direct synthesis of dimethyl ether (DME), conducted to demonstrate the potential of reactor-level and pellet-level structuring of catalytic active centers in process integration and intensification. To account for the pellet structure, the analysis was performed with the aid of a heterogeneous model considering both interphase and intrapellet mass transport resistances. The study evaluated, in terms of DME and methanol yield and selectivity, the performance of a tubular reactor loaded with a physical mixture of monofunctional catalyst pellets or structured bifunctional catalyst pellets with different arrangements of the catalytic centers. It was confirmed that bifunctional catalysts overperform significantly a physical mixture of monofunctional particles. Moreover, it was shown that the internal structure of a bifunctional catalyst pellet is an important feature that deserves to be exploited deeper, in view of further intensification of the DME synthesis process to be achieved with a better reactor design.

scholarly journals Supported Intermetallic PdZn Nanoparticles as Bifunctional Catalysts for the Direct Synthesis of Dimethyl Ether from CO‐Rich Synthesis Gas

2019 ◽  
Vol 131 (44) ◽  
pp. 15802-15806 ◽  
Author(s):  
Manuel Gentzen ◽  
Dmitry E. Doronkin ◽  
Thomas L. Sheppard ◽  
Anna Zimina ◽  
Haisheng Li ◽  
...  
Keyword(s):  
Dimethyl Ether ◽  
Synthesis Gas ◽  
Direct Synthesis ◽  
Bifunctional Catalysts ◽  
Pdzn Nanoparticles ◽  
Synthesis Of Dimethyl Ether
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