scholarly journals Design of efficient bifunctional catalysts for direct conversion of syngas into lower olefins via methanol/dimethyl ether intermediates

2018 ◽  
Vol 9 (20) ◽  
pp. 4708-4718 ◽  
Author(s):  
Xiaoliang Liu ◽  
Wei Zhou ◽  
Yudan Yang ◽  
Kang Cheng ◽  
Jincan Kang ◽  
...  
Keyword(s):  
Dimethyl Ether ◽  
Direct Conversion ◽  
Bifunctional Catalysts ◽  
Lower Olefins ◽  
Co Conversion

Zn–ZrO2/SSZ-13 catalyzed direct conversion of syngas into lower olefins via methanol/DME intermediates with 77% selectivity at 29% CO conversion.

Bifunctional catalysts based on colloidal Cu/Zn nanoparticles for the direct conversion of synthesis gas to dimethyl ether and hydrocarbons

2018 ◽  
Vol 557 ◽  
pp. 99-107 ◽  
Author(s):  
M. Gentzen ◽  
D.E. Doronkin ◽  
T.L. Sheppard ◽  
J.-D. Grunwaldt ◽  
J. Sauer ◽  
...  
Keyword(s):  
Dimethyl Ether ◽  
Synthesis Gas ◽  
Direct Conversion ◽  
Bifunctional Catalysts ◽  
Zn Nanoparticles

Direct Conversion of Dimethyl Ether and CO to Acetone via Coupling Carbonylation and Ketonization

2021 ◽  
Author(s):  
Ziqiao Zhou ◽  
Hongchao Liu ◽  
Youming Ni ◽  
Fuli Wen ◽  
Zhiyang Chen ◽  
...  
Keyword(s):  
Dimethyl Ether ◽  
Direct Conversion

Engineering Modified Mesoporous Silica Catalysts through Porosity and Surface Acidity Control for Selective Production of DME

2021 ◽  
Vol 894 ◽  
pp. 45-49
Author(s):  
Rosanna Viscardi ◽  
Vincenzo Barbarossa ◽  
Raimondo Maggi ◽  
Francesco Pancrazzi
Keyword(s):  
Mesoporous Silica ◽  
Dimethyl Ether ◽  
Sulfonic Acid ◽  
Pore Diameter ◽  
Solid Acid ◽  
Surface Acidity ◽  
High Surface ◽  
High Surface Area ◽  
Bifunctional Catalysts ◽  
Scanning Electronic Microscopy

DME has been received the attention as a renewable energy due to its thermal efficiencies equivalent to diesel fuel, lower NOx emission, near-zero smoke and non-toxic. DME can be obtained by methanol dehydration over solid acid catalysts or directly from syngas over bifunctional catalysts. The catalytic dehydration of methanol to DME has been widely studied in the literature over pure or modified γ -aluminas (γ-Al2O3) and zeolites. Mesoporous silica has obtained much consideration due to its well-defined structural order, high surface area, and tunable pore diameter. In this work, sulfonic acid and aluminium modified mesoporous silica were synthesized and tested as catalysts for production of dimethyl ether from methanol. The modified silicas were studied utilizing XRD, N2 physisorption, pyridine adsorption, and scanning electronic microscopy. The effects of reaction temperature and water deactivation on the methanol selectivity and conversion to dimethyl ether were investigated. Sulfonic acid modified mesoporous silica showed higher selectivity and stability of DME than that of aluminosilicate. The grafting of mesoporous silica with sulfonic groups displayed much more enhanced hydrothermal stability than Al-MCM-41 and γ-Al2O3.

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.

Catalysis by heteropoly compounds x. Synthesis of lower olefins by conversion of dimethyl ether over 12-tungstophosphates

1986 ◽  
Vol 24 (1-2) ◽  
pp. 69-83 ◽  
Author(s):  
Takuo Hibi ◽  
Kazuteru Takahashi ◽  
Toshio Okuhara ◽  
Makoto Misono ◽  
Yukio Yoneda
Keyword(s):  
Dimethyl Ether ◽  
Heteropoly Compounds ◽  
Lower Olefins

Zeolite catalysts modified with zirconium and sulfur compounds in the conversion of dimethyl ether to lower olefins

2012 ◽  
Vol 52 (3) ◽  
pp. 155-160 ◽  
Author(s):  
N. V. Kolesnichenko ◽  
E. E. Kolesnikova ◽  
L. E. Kitaev ◽  
E. N. Biryukova ◽  
N. I. Trukhmanova ◽  
...  
Keyword(s):  
Dimethyl Ether ◽  
Sulfur Compounds ◽  
Zeolite Catalysts ◽  
Lower Olefins

scholarly journals Direct Conversion of CO2 into Dimethyl Ether over Al2O3/Cu/ZnO Catalysts Prepared by Sequential Precipitation

Catalysts ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 524 ◽  
Author(s):  
Cheonwoo Jeong ◽  
Jinsung Kim ◽  
Ji-Hyeon Kim ◽  
Sunghoon Lee ◽  
Jong Wook Bae ◽  
...  
Keyword(s):  
Dimethyl Ether ◽  
Catalyst System ◽  
Direct Conversion ◽  
Mixed Metal Oxide ◽  
Oxide Materials ◽  
Co2 Conversion ◽  
Activity Test ◽  
Sequential Precipitation ◽  
Dual Bed ◽  
Complete Precipitation

Bifunctional Al2O3/Cu/ZnO catalysts with Al composition of between 30 mol% and 80 mol% were prepared by sequential precipitation (SP) for the conversion of CO2 into dimethyl ether (DME). In the SP synthesis, the concentration of a precipitation agent managed to be high enough to induce the complete precipitation of Al3+. The prepared precipitates were composed of zincian malachite and amorphous AlO(OH). Furthermore, the calcined mixed metal oxide materials of 60% and 80% Al exhibited a higher acidity than commercial Al2O3 and the H2-reduced catalysts showed the similar Cu dispersion of 6%–7% at all Cu loadings. In the activity test at 573 K and 50 bar, the SP-derived catalyst of 80% Al (SP-80) displayed the best performance corresponding to CO2 conversion of 25% and DME selectivity of 75% that are close to equilibrium values. In order to overcome the thermodynamic limitation, a dual-bed catalyst system was made up of SP-80 in the first layer and zeolite ferrierite in the next. This approach enabled DME selectivity to be enhanced to 90% while CO2 conversion increased a little. Consequently, the studied catalyst system based on the SP-derived catalysts can contribute greatly to selective DME production from CO2.

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