Direct conversion of syngas to dimethyl ether as a green fuel over CuO-ZnO-Al2O3/HZSM-5 nanocatalyst: Effect of aging time on physicochemical and catalytic properties

2015 ◽  
Vol 7 (2) ◽  
pp. 023127 ◽  
Author(s):  
Reza Khoshbin ◽  
Mohammad Haghighi
Keyword(s):  
Aging Time ◽  
Dimethyl Ether ◽  
Catalytic Properties ◽  
Direct Conversion ◽  
Green Fuel

Direct conversion of syngas to dimethyl ether as a green fuel over ultrasound-assisted synthesized CuO–ZnO–Al2O3/HZSM-5 nanocatalyst: effect of active phase ratio on physicochemical and catalytic properties at different process conditions

2014 ◽  
Vol 4 (6) ◽  
pp. 1779-1792 ◽  
Author(s):  
Reza Khoshbin ◽  
Mohammad Haghighi
Keyword(s):  
Dimethyl Ether ◽  
Catalytic Properties ◽  
Active Phase ◽  
Direct Conversion ◽  
Phase Ratio ◽  
Process Conditions ◽  
Ultrasound Assisted ◽  
Co Precipitation ◽  
Green Fuel

Hybrid co-precipitation–ultrasound synthesis of CuO–ZnO–Al2O3/HZSM-5 used in direct conversion of syngas to dimethyl ether as a green fuel.

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

Effect of magnesium on the catalytic properties of polymetallic zeolite catalysts for conversion of dimethyl ether to light olefins

2020 ◽  
Vol 298 ◽  
pp. 110087 ◽  
Author(s):  
N.V. Kolesnichenko ◽  
Е.N. Khivrich ◽  
T.K. Obukhova ◽  
Т.I. Batova ◽  
G.N. Bondarenko
Keyword(s):  
Dimethyl Ether ◽  
Catalytic Properties ◽  
Zeolite Catalysts ◽  
Light Olefins

Polyol synthesis of non-stoichiometric Mn–Zn ferrite nanocrystals: structural /microstructural characterization and catalytic application

RSC Advances ◽  
2015 ◽  
Vol 5 (80) ◽  
pp. 65010-65022 ◽  
Author(s):  
Z. Beji ◽  
M. Sun ◽  
L. S. Smiri ◽  
F. Herbst ◽  
C. Mangeney ◽  
...  
Keyword(s):  
Dimethyl Ether ◽  
Oxidation Reaction ◽  
Catalytic Properties ◽  
Microstructural Characterization ◽  
Ferrite Nanoparticles ◽  
Polyol Synthesis ◽  
Catalytic Application ◽  
Zn Ferrite ◽  
Structure And Microstructure

The structure and microstructure of polyol-made non-stoichiometric Mn–Zn ferrite nanoparticles were successfully investigated and correlated to their catalytic properties toward dimethyl ether oxidation reaction.

scholarly journals Enhanced Direct Dimethyl Ether Synthesis from CO2-Rich Syngas with Cu/ZnO/ZrO2 Catalysts Prepared by Continuous Co-Precipitation

Catalysts ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 816
Author(s):  
Sabrina Polierer ◽  
David Guse ◽  
Stefan Wild ◽  
Karla Herrera Delgado ◽  
Thomas N. Otto ◽  
...  
Keyword(s):  
Dimethyl Ether ◽  
Catalytic Properties ◽  
Direct Synthesis ◽  
Copper Surface ◽  
Precipitation Method ◽  
Dme Synthesis ◽  
Surface Areas ◽  
Dimethyl Ether Synthesis ◽  
Material Homogeneity ◽  
Co Precipitation

The manufacturing of technical catalysts generally involves a sequence of different process steps, of which co-precipitation is one of the most important. In this study, we investigate how continuous co-precipitation influences the properties of Cu/ZnO/ZrO2 (CZZ) catalysts and their application in the direct synthesis of dimethyl ether (DME) from CO2/CO/H2 feeds. We compare material characteristics investigated by means of XRF, XRD, N2 physisorption, H2-TPR, N2O-RFC, TEM and EDXS as well as the catalytic properties to those of CZZ catalysts prepared by a semi-batch co-precipitation method. Ultra-fast mixing in continuous co-precipitation results in high BET and copper surface areas as well as in improved metal dispersion. DME synthesis performed in combination with a ferrierite-type co-catalyst shows correspondingly improved productivity for CZZ catalysts prepared by the continuous co-precipitation method, using CO2-rich as well as CO-rich syngas feeds. Our continuous co-precipitation approach allows for improved material homogeneity due to faster and more homogeneous solid formation. The so-called “chemical memory” stamped during initial co-precipitation is kept through all process steps and is reflected in the final catalytic properties. Furthermore, our continuous co-precipitation approach may be easily scaled-up to industrial production rates by numbering-up. Hence, we believe that our approach represents a promising contribution to improve catalysts for direct DME synthesis.

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.

scholarly journals Conversion of dimethyl ether to toluene under an O2 stream over W/HZSM-5 catalysts

2015 ◽  
Vol 5 (3) ◽  
pp. 1813-1820 ◽  
Author(s):  
Bo Wang ◽  
Hui Wang ◽  
Guangbo Liu ◽  
Xuemin Li ◽  
Jinhu Wu
Keyword(s):  
Dimethyl Ether ◽  
Direct Conversion

The direct conversion of dimethyl ether (DME) to toluene without other aromatics is realized over W/HZSM-5 catalysts with high W contents.

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