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Surface structure and sulfidation behavior of Co-Mo and Co-W sulfide catalysts for the hydrodesulfurization of dibenzothiophene

Paper ID Volume ID Publish Year Pages File Format Full-Text
39628 45829 2014 7 PDF Available
Title
Surface structure and sulfidation behavior of Co-Mo and Co-W sulfide catalysts for the hydrodesulfurization of dibenzothiophene
Abstract

•The formation of Co-W-S and Co-Mo-S active sites was investigated by in situ XAFS.•The Co-W-S coverage was found to be smaller than the Co-Mo-S coverage.•The degree of active site blocking of WS2 by Co9S8 was higher than that of MoS2.

The catalytic property and local structure of Co-MoS2 and Co-WS2 catalysts were investigated by means of the Co-CVD technique using Co(CO)3NO and XAFS. Comparing the catalytic activity for the HDS of DBT between Co-MoS2 and Co-WS2 catalysts before and after the CVD treatment, it was shown that the Co coverage of the edge sites of WS2 particles is lower than that of MoS2 particles, leading to a smaller amount of the Co-W-S structure in the catalyst. Furthermore, edge sites of WS2 particles are more extensively blocked by excess Co sulfide particles than those of MoS2 particles at a high Co loading (>5 wt%). In situ, W L3-edge, Mo K-edge and Co K-edge XAFS analyses during catalyst sulfidation revealed that sulfidation temperature of W atoms is much higher than those of Mo and Co. The difficulty in the formation of Co-W-S on the Co-WS2 catalysts is related to this specific sulfidation behavior of W.

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Keywords
Hydrodesulfurization; CoMoS; CoWS; In situ XAFS; CVD technique
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Surface structure and sulfidation behavior of Co-Mo and Co-W sulfide catalysts for the hydrodesulfurization of dibenzothiophene
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 480, 20 June 2014, Pages 10–16
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
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100% Money Back Guarantee
Full-text PDF Download
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