Journal
JOURNAL OF CATALYSIS
Volume 403, Issue -, Pages 74-86Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2021.03.008
Keywords
Hydrotreating; Ultra-low sulfur diesel; Co-Mo-S; Pt; Promoters; Active sites
Categories
Funding
- Danish National Research Foundation Center for Visualizing Catalytic Processes (VISION) [DNRF146]
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The Pt-Co-Mo-S catalyst contains mainly single-layer MoS2 nanocrystals with Co atoms fully covering the S-edge terminations, and Pt atoms uniquely attached to corner and edge sites in a platinum(IV) sulfide-like structural motif. Platinum is suggested to reduce the sulfur binding energy and increase the abundance of coordinately undersaturated sites (CUS) without necessarily changing the reactivity towards 4,6-DMDBT molecules, although further studies are needed for a detailed understanding.
We introduce a tertiary transition metal sulfide nanostructure, Pt-Co-Mo-S, for catalytic hydrodesulfurization (HDS) of sulfur-containing molecules in crude oil distillates with the aim to produce ultra-low sulfur transport fuels. The addition of ppm-levels of Pt to a standard industrial Co-Mo-S catalyst boosts the HDS activity by up to 46%. The promotional effect is examined by combining atomic-resolution Scanning Transmission Electron Microscopy (STEM), Energy Dispersive X-ray Spectroscopy (EDX), X-ray Absorption Near Edge Spectroscopy (XANES) and Density Functional Theory (DFT). It is shown that the Pt-Co-Mo-S catalyst contains predominantly single-layer MoS2 nanocrystals with Co atoms fully covering the S-edge terminations and Pt atoms uniquely attached to corner and edge sites in a platinum(IV) sulfide-like structural motif. Platinum is suggested to reduce the sulfur binding energy and increase the abundance of coordinately undersaturated sites (CUS) and not necessarily changing the reactivity towards 4,6-DMDBT molecules, although more elaborate studies are needed to address this in detail. (C) 2021 The Authors. Published by Elsevier Inc.
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