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 ◽  
...  

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.

Author(s):  
Ziqiao Zhou ◽  
Hongchao Liu ◽  
Youming Ni ◽  
Fuli Wen ◽  
Zhiyang Chen ◽  
...  

ChemSusChem ◽  
2016 ◽  
Vol 10 (1) ◽  
pp. 210-219 ◽  
Author(s):  
Melissandre Richard ◽  
Daniel Duprez ◽  
Nicolas Bion ◽  
Fabien Can

2018 ◽  
Vol 8 (8) ◽  
pp. 2087-2097 ◽  
Author(s):  
Xinhua Gao ◽  
Bolian Xu ◽  
Guohui Yang ◽  
Xiaobo Feng ◽  
Yoshiharu Yoneyama ◽  
...  

A novel dual bed reactor packed with H-ferrierite and CuZnAl catalysts for efficient ethanol synthesis from DME and syngas.


2002 ◽  
Vol 3 (6) ◽  
pp. 233-238 ◽  
Author(s):  
M. Machida ◽  
T. Watanabe ◽  
S. Ikeda ◽  
T. Kijima

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

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


2010 ◽  
Vol 12 (2) ◽  
pp. 223 ◽  
Author(s):  
Elif I. Gürbüz ◽  
Edward L. Kunkes ◽  
James A. Dumesic

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