The Effect of Atomic Layer Deposited Overcoat on Co-Pt-Si/γ-Al<sub>2</sub>O<sub>3</sub> Fischer–Tropsch Catalyst
Atomic layer deposition (ALD) was used to prepare a thin alumina layer on Fischer–Tropsch catalysts. Co-Pt-Si/γ-Al<sub>2</sub>O<sub>3</sub> catalyst was overcoated with 15–40 cycles of Al<sub>2</sub>O<sub>3</sub> deposited from trimethylaluminum (TMA)...
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MDPI AG
2021-05-01
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| Series: | Catalysts |
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| Online Access: | https://www.mdpi.com/2073-4344/11/6/672 |
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| author | Niko Heikkinen Laura Keskiväli Patrik Eskelinen Matti Reinikainen Matti Putkonen |
| author_facet | Niko Heikkinen Laura Keskiväli Patrik Eskelinen Matti Reinikainen Matti Putkonen |
| author_sort | Niko Heikkinen |
| collection | DOAJ |
| description | Atomic layer deposition (ALD) was used to prepare a thin alumina layer on Fischer–Tropsch catalysts. Co-Pt-Si/γ-Al<sub>2</sub>O<sub>3</sub> catalyst was overcoated with 15–40 cycles of Al<sub>2</sub>O<sub>3</sub> deposited from trimethylaluminum (TMA) and water vapor, followed by thermal annealing. The resulting tailored Fischer–Tropsch catalyst with 35 cycle ALD overcoating had increased activity compared to unmodified catalyst. The increase in activity was achieved without significant loss of selectivity towards heavier hydrocarbons. Altered catalyst properties were assumed to result from cobalt particle stabilization by ALD alumina overcoating and nanoscale porosity of the overcoating. In addition to optimal thickness of the overcoat, thermal annealing was an essential part of preparing ALD overcoated catalyst. |
| first_indexed | 2024-03-10T11:05:39Z |
| format | Article |
| id | doaj.art-9e8dc3710fbe4105b4f7ec2b83810ca2 |
| institution | Directory Open Access Journal |
| issn | 2073-4344 |
| language | English |
| last_indexed | 2024-03-10T11:05:39Z |
| publishDate | 2021-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Catalysts |
| spelling | doaj.art-9e8dc3710fbe4105b4f7ec2b83810ca22023-11-21T21:10:10ZengMDPI AGCatalysts2073-43442021-05-0111667210.3390/catal11060672The Effect of Atomic Layer Deposited Overcoat on Co-Pt-Si/γ-Al<sub>2</sub>O<sub>3</sub> Fischer–Tropsch CatalystNiko Heikkinen0Laura Keskiväli1Patrik Eskelinen2Matti Reinikainen3Matti Putkonen4VTT Technical Research Centre of Finland, P.O. Box 1000, FIN-02044 VTT Espoo, FinlandVTT Technical Research Centre of Finland, P.O. Box 1000, FIN-02044 VTT Espoo, FinlandVTT Technical Research Centre of Finland, P.O. Box 1000, FIN-02044 VTT Espoo, FinlandVTT Technical Research Centre of Finland, P.O. Box 1000, FIN-02044 VTT Espoo, FinlandDepartment of Chemistry, University of Helsinki, P.O. Box 55, FI-00014 Helsinki, FinlandAtomic layer deposition (ALD) was used to prepare a thin alumina layer on Fischer–Tropsch catalysts. Co-Pt-Si/γ-Al<sub>2</sub>O<sub>3</sub> catalyst was overcoated with 15–40 cycles of Al<sub>2</sub>O<sub>3</sub> deposited from trimethylaluminum (TMA) and water vapor, followed by thermal annealing. The resulting tailored Fischer–Tropsch catalyst with 35 cycle ALD overcoating had increased activity compared to unmodified catalyst. The increase in activity was achieved without significant loss of selectivity towards heavier hydrocarbons. Altered catalyst properties were assumed to result from cobalt particle stabilization by ALD alumina overcoating and nanoscale porosity of the overcoating. In addition to optimal thickness of the overcoat, thermal annealing was an essential part of preparing ALD overcoated catalyst.https://www.mdpi.com/2073-4344/11/6/672Fischer–Tropsch synthesiscobalt catalystatomic layer depositionALDcobalt on aluminaannealing |
| spellingShingle | Niko Heikkinen Laura Keskiväli Patrik Eskelinen Matti Reinikainen Matti Putkonen The Effect of Atomic Layer Deposited Overcoat on Co-Pt-Si/γ-Al<sub>2</sub>O<sub>3</sub> Fischer–Tropsch Catalyst Catalysts Fischer–Tropsch synthesis cobalt catalyst atomic layer deposition ALD cobalt on alumina annealing |
| title | The Effect of Atomic Layer Deposited Overcoat on Co-Pt-Si/γ-Al<sub>2</sub>O<sub>3</sub> Fischer–Tropsch Catalyst |
| title_full | The Effect of Atomic Layer Deposited Overcoat on Co-Pt-Si/γ-Al<sub>2</sub>O<sub>3</sub> Fischer–Tropsch Catalyst |
| title_fullStr | The Effect of Atomic Layer Deposited Overcoat on Co-Pt-Si/γ-Al<sub>2</sub>O<sub>3</sub> Fischer–Tropsch Catalyst |
| title_full_unstemmed | The Effect of Atomic Layer Deposited Overcoat on Co-Pt-Si/γ-Al<sub>2</sub>O<sub>3</sub> Fischer–Tropsch Catalyst |
| title_short | The Effect of Atomic Layer Deposited Overcoat on Co-Pt-Si/γ-Al<sub>2</sub>O<sub>3</sub> Fischer–Tropsch Catalyst |
| title_sort | effect of atomic layer deposited overcoat on co pt si γ al sub 2 sub o sub 3 sub fischer tropsch catalyst |
| topic | Fischer–Tropsch synthesis cobalt catalyst atomic layer deposition ALD cobalt on alumina annealing |
| url | https://www.mdpi.com/2073-4344/11/6/672 |
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