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Combined effect of noble metals (Pd, Au) and support properties on HDS activity of Co/SiO2 catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
42954 45948 2009 9 PDF Available
Title
Combined effect of noble metals (Pd, Au) and support properties on HDS activity of Co/SiO2 catalysts
Abstract

Cobalt-based catalysts supported on different types of SiO2 are studied in the hydrodesulfurization of thiophene. Amorphous silica and siliceous MCM-41 and HMS, characterized by different texture and surface acidity are used as carriers. The effects due to the modification of the support by impregnation with palladium precursor and to the co-impregnation of cobalt and gold are considered. The catalysts are characterized by N2 physisorption (BET), XRD, TPR and XPS techniques. The use as supports of the ordered mesoporous silica with higher surface area with respect to amorphous silica, produces a better dispersion of the cobalt oxides particles. Moreover, the addition of palladium to the supports inhibits the interaction between cobalt and silica and favors the reducibility of the cobalt oxide. Co-impregnation of gold and cobalt decreases the Co3O4 crystallite size. Due to the combination of these effects an increase in the cobalt activity is observed. The extent of the improvement is highly dependent on the support characteristics. As compared to the monometallic Co catalysts, the monometallic Pd catalysts supported on amorphous SiO2 and on MCM-41 are less active. However quite unexpectedly the Pd/HMS exhibits the best performance among all the studied samples. Catalytic tests of HDS of tetrahydrothiophene (THT) support the direct route of the C–S bond cleavage as the rate-determining step of the reaction.

Graphical abstractCobalt-based catalysts supported on different types of SiO2 are studied in the hydrodesulfurization of thiophene taken as model molecule. The study involves the structural and surface characterization of Co-based catalysts supported on amorphous and mesoporous silica (MCM-41 and HMS) for application in hydrodesulfurization. The effects of the support structural properties and of the addition of noble metals (Pd and Au) are investigated. Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Hydrodesulfurization; HDS Co catalysts; Pd; Au effect; Mesoporous supports
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Combined effect of noble metals (Pd, Au) and support properties on HDS activity of Co/SiO2 catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 353, Issue 2, 1 February 2009, Pages 296–304
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