Direct Conversion of CO₂ into Dimethyl Ether over Al₂O₃/Cu/ZnO Catalysts Prepared by Sequential Precipitationopen access
- Authors
- Jeong, Cheonwoo; Kim, Jinsung; Kim, Ji-Hyeon; Lee, Sunghoon; Bae, Jong Wook; Suh, Young-Woong
- Issue Date
- Jun-2019
- Publisher
- MDPI
- Keywords
- CO2 conversion; Dimethyl ether; Sequential precipitation; Bifunctional catalyst
- Citation
- CATALYSTS, v.9, no.6, pp.1 - 12
- Indexed
- SCIE
SCOPUS
- Journal Title
- CATALYSTS
- Volume
- 9
- Number
- 6
- Start Page
- 1
- End Page
- 12
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/32861
- DOI
- 10.3390/catal9060524
- ISSN
- 2073-4344
- Abstract
- 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 H-2-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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