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

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Heikkinen , N , Keskivali , L , Eskelinen , P , Reinikainen , M & Putkonen , M 2021 , ' The Effect of Atomic Layer Deposited Overcoat on Co-Pt-Si/gamma-Al2O3 Fischer-Tropsch Catalyst ' , Catalysts , vol. 11 , no. 6 , 672 . https://doi.org/10.3390/catal11060672

Title: The Effect of Atomic Layer Deposited Overcoat on Co-Pt-Si/gamma-Al2O3 Fischer-Tropsch Catalyst
Author: Heikkinen, Niko; Keskivali, Laura; Eskelinen, Patrik; Reinikainen, Matti; Putkonen, Matti
Contributor: University of Helsinki, Department of Chemistry
Date: 2021-06
Language: eng
Number of pages: 15
Belongs to series: Catalysts
ISSN: 2073-4344
URI: http://hdl.handle.net/10138/332760
Abstract: Atomic layer deposition (ALD) was used to prepare a thin alumina layer on Fischer-Tropsch catalysts. Co-Pt-Si/gamma-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.
Subject: 116 Chemical sciences
Fischer-Tropsch synthesis
cobalt catalyst
atomic layer deposition
ALD
cobalt on alumina
annealing
catalyst overcoating
SUPPORTED COBALT CATALYSTS
ALUMINA
SIZE
STABILIZATION
REDUCIBILITY
SELECTIVITY
ADSORPTION
STABILITY
PROMOTER
AL2O3
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