Heteropolyacid Incorporated Bifunctional Core-Shell Catalysts for Dimethyl Ether Synthesis from Carbon Dioxide/Syngas
Core-shell-type catalysts, which are synthesized by encapsulating the Cu-ZnO-Alumina type methanol synthesis catalyst (CZA) by silicotungstic acid (STA)-incorporated mesoporous alumina, were prepared following a hydrothermal route and tested in DME synthesis from syngas and CO<sub>2</sub>...
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MDPI AG
2022-09-01
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| Series: | Catalysts |
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| Online Access: | https://www.mdpi.com/2073-4344/12/10/1102 |
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| author | Birce Pekmezci Karaman Nuray Oktar Gülşen Doğu Timur Dogu |
| author_facet | Birce Pekmezci Karaman Nuray Oktar Gülşen Doğu Timur Dogu |
| author_sort | Birce Pekmezci Karaman |
| collection | DOAJ |
| description | Core-shell-type catalysts, which are synthesized by encapsulating the Cu-ZnO-Alumina type methanol synthesis catalyst (CZA) by silicotungstic acid (STA)-incorporated mesoporous alumina, were prepared following a hydrothermal route and tested in DME synthesis from syngas and CO<sub>2</sub>. Activity tests, which were performed in the pressure range of 30–50 bar, and the temperature range of 200–300 °C, with different feed compositions (CO<sub>2</sub>/CO/H<sub>2</sub>: 50/-/50, 40/10/50, 25/25/50, 10/40/50) showed that the best-operating conditions for the highest DME yield were 275 °C and 50 bar. Results proved that the presence of CO<sub>2</sub> in the syngas had a positive effect on the DME yield. The total conversion of CO + CO<sub>2</sub> increased with an increase in CO<sub>2</sub>/CO ratio. An overall conversion of CO + CO<sub>2</sub> and DME selectivity values were obtained as 65.6% and 73.2%, respectively, with a feed composition of H<sub>2</sub>/CO<sub>2</sub>/CO = 50/40/10. Synthesis of methanol using the CZA catalyst from the CO<sub>2</sub>-containing gas mixtures was also investigated, and the total conversion of CO + CO<sub>2</sub> and methanol selectivity values of 32.0% and 83.6%, respectively, were obtained with the H<sub>2</sub>/CO<sub>2</sub>/CO = 50/40/10 gas mixture. Results proved that the new STA incorporated core-shell-type bifunctional catalysts were highly promising for the conversion of CO<sub>2-</sub>containing syngas to DME. |
| first_indexed | 2024-03-09T20:31:34Z |
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| institution | Directory Open Access Journal |
| issn | 2073-4344 |
| language | English |
| last_indexed | 2024-03-09T20:31:34Z |
| publishDate | 2022-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Catalysts |
| spelling | doaj.art-e6337d70d9d44f03b6631cfb7480a17f2023-11-23T23:23:37ZengMDPI AGCatalysts2073-43442022-09-011210110210.3390/catal12101102Heteropolyacid Incorporated Bifunctional Core-Shell Catalysts for Dimethyl Ether Synthesis from Carbon Dioxide/SyngasBirce Pekmezci Karaman0Nuray Oktar1Gülşen Doğu2Timur Dogu3Chemical Engineering Department, Gazi University, Ankara 06570, TurkeyChemical Engineering Department, Gazi University, Ankara 06570, TurkeyChemical Engineering Department, Gazi University, Ankara 06570, TurkeyChemical Engineering Department, Middle East Technical University, Ankara 06800, TurkeyCore-shell-type catalysts, which are synthesized by encapsulating the Cu-ZnO-Alumina type methanol synthesis catalyst (CZA) by silicotungstic acid (STA)-incorporated mesoporous alumina, were prepared following a hydrothermal route and tested in DME synthesis from syngas and CO<sub>2</sub>. Activity tests, which were performed in the pressure range of 30–50 bar, and the temperature range of 200–300 °C, with different feed compositions (CO<sub>2</sub>/CO/H<sub>2</sub>: 50/-/50, 40/10/50, 25/25/50, 10/40/50) showed that the best-operating conditions for the highest DME yield were 275 °C and 50 bar. Results proved that the presence of CO<sub>2</sub> in the syngas had a positive effect on the DME yield. The total conversion of CO + CO<sub>2</sub> increased with an increase in CO<sub>2</sub>/CO ratio. An overall conversion of CO + CO<sub>2</sub> and DME selectivity values were obtained as 65.6% and 73.2%, respectively, with a feed composition of H<sub>2</sub>/CO<sub>2</sub>/CO = 50/40/10. Synthesis of methanol using the CZA catalyst from the CO<sub>2</sub>-containing gas mixtures was also investigated, and the total conversion of CO + CO<sub>2</sub> and methanol selectivity values of 32.0% and 83.6%, respectively, were obtained with the H<sub>2</sub>/CO<sub>2</sub>/CO = 50/40/10 gas mixture. Results proved that the new STA incorporated core-shell-type bifunctional catalysts were highly promising for the conversion of CO<sub>2-</sub>containing syngas to DME.https://www.mdpi.com/2073-4344/12/10/1102dimethyl ethermethanolcarbon dioxidecore-shell catalystsilicotungstic acid |
| spellingShingle | Birce Pekmezci Karaman Nuray Oktar Gülşen Doğu Timur Dogu Heteropolyacid Incorporated Bifunctional Core-Shell Catalysts for Dimethyl Ether Synthesis from Carbon Dioxide/Syngas Catalysts dimethyl ether methanol carbon dioxide core-shell catalyst silicotungstic acid |
| title | Heteropolyacid Incorporated Bifunctional Core-Shell Catalysts for Dimethyl Ether Synthesis from Carbon Dioxide/Syngas |
| title_full | Heteropolyacid Incorporated Bifunctional Core-Shell Catalysts for Dimethyl Ether Synthesis from Carbon Dioxide/Syngas |
| title_fullStr | Heteropolyacid Incorporated Bifunctional Core-Shell Catalysts for Dimethyl Ether Synthesis from Carbon Dioxide/Syngas |
| title_full_unstemmed | Heteropolyacid Incorporated Bifunctional Core-Shell Catalysts for Dimethyl Ether Synthesis from Carbon Dioxide/Syngas |
| title_short | Heteropolyacid Incorporated Bifunctional Core-Shell Catalysts for Dimethyl Ether Synthesis from Carbon Dioxide/Syngas |
| title_sort | heteropolyacid incorporated bifunctional core shell catalysts for dimethyl ether synthesis from carbon dioxide syngas |
| topic | dimethyl ether methanol carbon dioxide core-shell catalyst silicotungstic acid |
| url | https://www.mdpi.com/2073-4344/12/10/1102 |
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