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The single-layered morphology of supported MoS2-based catalysts—The role of the cobalt promoter and its effects in the hydrodesulfurization of dibenzothiophene

Paper ID Volume ID Publish Year Pages File Format Full-Text
43328 45964 2008 9 PDF Available
Title
The single-layered morphology of supported MoS2-based catalysts—The role of the cobalt promoter and its effects in the hydrodesulfurization of dibenzothiophene
Abstract

In order to completely resolve the morphology of supported hydrodesulfurization (HDS) catalysts, synchrotron X-ray scattering studies of silica- and alumina-supported MoS2 catalysts have been carried out and compared to results previously reported for their cobalt-promoted counterparts [J. Catal. 225 (2004) 288]. The present study is mainly centered on the structural role of cobalt and of support interactions and on their influence on the morphology and catalytic properties of these transition metal sulfide catalysts.Results showed that cobalt promoter strongly enhances the stacking height of MoS2 layers. However this effect is counterbalanced by hydrodesulfurization conditions that favor in an opposite way the formation of single slabs. Single slab morphology suggests that the vast majority of the sites on MoS2 layers are “rim” sites able to perform both hydrogenation and CS bond cleavage steps. Moreover, the complete determination of the morphology of these catalysts allowed correlation of structural and catalytic properties for both supported MoS2 and CoMo catalysts. This approach led us to examine the respective influences of the MoS2 slab morphology and of support interactions on activity and selectivity properties of HDS MoS2-based catalysts.

Graphical abstractSynchrotron X-ray scattering studies of silica- and alumina-supported (Co)/MoS2 catalysts have been carried out to study the role of cobalt on the morphology and catalytic properties of these catalysts. Cobalt enhances the stacking height of MoS2 layers. However, this effect is counterbalanced by hydrodesulfurization conditions that favor the formation of single slabs. The complete determination of the morphology of these catalysts allowed correlation of structural and catalytic properties.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
CoMo; Hydrodesulfurization; Cobalt promotion; Hydrogenation; Support interaction; Selectivity
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The single-layered morphology of supported MoS2-based catalysts—The role of the cobalt promoter and its effects in the hydrodesulfurization of dibenzothiophene
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 345, Issue 1, 31 July 2008, Pages 80–88
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us