The Effect of Atomic Layer Deposited Overcoat on Co-Pt-Si/γ-Al2O3 Fischer–Tropsch Catalyst

Niko Heikkinen; Laura Keskiväli; Patrik Eskelinen; Matti Reinikainen; Matti Putkonen

doi:10.3390/catal11060672

The Effect of Atomic Layer Deposited Overcoat on Co-Pt-Si/γ-Al2O3 Fischer–Tropsch Catalyst

Niko Heikkinen^*, Laura Keskiväli, Patrik Eskelinen, Matti Reinikainen, Matti Putkonen

^*Corresponding author for this work

BA5205 Chemical and polymer synthesis

Research output: Contribution to journal › Article › Scientific › peer-review

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Abstract

Atomic layer deposition (ALD) was used to prepare a thin alumina layer on Fischer–Tropsch catalysts. Co-Pt-Si/γ-Al2O3 catalyst was overcoated with 15–40 cycles of Al2O3 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.

Original language	English
Article number	672
Journal	Catalysts
Volume	11
Issue number	6
DOIs	https://doi.org/10.3390/catal11060672
Publication status	Published - 24 May 2021
MoE publication type	A1 Journal article-refereed

Funding

This research was funded by European Union’s Horizon 2020 research and innovation program under grant agreement no. 768543 (ICO2CHEM project-From industrial CO2 streams to added value Fischer–Tropsch chemicals). M.P. acknowledges funding from the Academy of Finland by the profiling action on Matter and Materials, grant no. 318913.

Keywords

Fischer–Tropsch synthesis
cobalt catalyst
atomic layer deposition
ALD
cobalt on alumina
annealing
catalyst overcoating

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title = "The Effect of Atomic Layer Deposited Overcoat on Co-Pt-Si/γ-Al2O3 Fischer–Tropsch Catalyst",

abstract = "Atomic layer deposition (ALD) was used to prepare a thin alumina layer on Fischer–Tropsch catalysts. Co-Pt-Si/γ-Al2O3 catalyst was overcoated with 15–40 cycles of Al2O3 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.",

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author = "Niko Heikkinen and Laura Keskiv{\"a}li and Patrik Eskelinen and Matti Reinikainen and Matti Putkonen",

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AU - Keskiväli, Laura

AU - Eskelinen, Patrik

AU - Reinikainen, Matti

AU - Putkonen, Matti

PY - 2021/5/24

Y1 - 2021/5/24

N2 - Atomic layer deposition (ALD) was used to prepare a thin alumina layer on Fischer–Tropsch catalysts. Co-Pt-Si/γ-Al2O3 catalyst was overcoated with 15–40 cycles of Al2O3 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.

AB - Atomic layer deposition (ALD) was used to prepare a thin alumina layer on Fischer–Tropsch catalysts. Co-Pt-Si/γ-Al2O3 catalyst was overcoated with 15–40 cycles of Al2O3 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.

KW - Fischer–Tropsch synthesis

KW - cobalt catalyst

KW - atomic layer deposition

KW - ALD

KW - cobalt on alumina

KW - annealing

KW - catalyst overcoating

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ER -

The Effect of Atomic Layer Deposited Overcoat on Co-Pt-Si/γ-Al2O3 Fischer–Tropsch Catalyst

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