Print Email Facebook Twitter Synthesis of highly-uniform titania overcoats on a mesoporous alumina catalyst support by atomic layer deposition and their application in hydroprocessing Title Synthesis of highly-uniform titania overcoats on a mesoporous alumina catalyst support by atomic layer deposition and their application in hydroprocessing Author Moulijn, J.A. (TU Delft ChemE/Product and Process Engineering; Delft IMP B.V.) van Ommen, J.R. (TU Delft ChemE/Product and Process Engineering) Goulas, A. (TU Delft ChemE/Product and Process Engineering) Valdesueiro Gonzalez, D. (TU Delft ChemE/Product and Process Engineering) Juan-Alcañiz, Jana (Ketjen, Amsterdam) Au-Yeung, Kar Ming (Ketjen, Amsterdam) Woning, Leo (Ketjen, Amsterdam) Bergwerff, Jaap A. (Student TU Delft) Date 2023 Abstract The feasibility of gas phase deposition using a Ti alkoxide precursor for precise surface modification of catalysts was demonstrated by modifying a mesoporous alumina support with a Ti oxide overcoat. Titanium tetra-isopropoxide yields a Ti oxide layer that covers homogeneously the alumina surface. Uniformity of the deposited TiO2 was verified by SEM-EDX, on both intra-particle and inter-particle levels. Only a few atomic layer deposition (ALD) cycles were required in order to obtain Ti contents with a relevance for industrial application. The pore size distribution of the overcoated catalyst support was barely affected by the coating process. Synthesized CoMo catalysts based on the Ti-alumina carrier showed up to 40% higher activity compared to a catalyst supported on pristine alumina, in hydroprocessing under industrial testing conditions. The TiO2 coating appeared to be stable, showing no agglomeration characteristics after reaction as corroborated by TEM-EDX. ALD provides a scalable route with low waste generation for the production of precisely structured TiO2-Al2O3 hydroprocessing catalyst supports. To reference this document use: http://resolver.tudelft.nl/uuid:623d2a38-77f0-40e3-b8ef-a7e0c1c6ac42 DOI https://doi.org/10.1039/d3cy00335c ISSN 2044-4753 Source Catalysis Science & Technology, 13 (12), 3537-3544 Part of collection Institutional Repository Document type journal article Rights © 2023 J.A. Moulijn, J.R. van Ommen, A. Goulas, D. Valdesueiro Gonzalez, Jana Juan-Alcañiz, Kar Ming Au-Yeung, Leo Woning, Jaap A. Bergwerff Files PDF d3cy00335c.pdf 3.63 MB Close viewer /islandora/object/uuid:623d2a38-77f0-40e3-b8ef-a7e0c1c6ac42/datastream/OBJ/view