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Role of Pt in high performance Pt-Mo catalysts for hydrotreatment reactions

Paper ID Volume ID Publish Year Pages File Format Full-Text
43886 45993 2006 9 PDF Available
Title
Role of Pt in high performance Pt-Mo catalysts for hydrotreatment reactions
Abstract

The effect of Pt/(Pt + Mo) atomic ratio, metal content and the characteristics of the alumina support on activity and synergy in hydrotreatment (HDT) reactions were studied. Pt-Mo supported on different commercial gamma alumina (γ-Al2O3) catalysts with different metal contents were prepared and evaluated in simultaneous dibenzothiophene (DBT) hydrodesulfurization (HDS) and naphthalene hydrogenation (HYD) reactions. The characterization of the catalysts was performed using CO chemisorption, proton affinity distribution (PAD) and infrared (IR) spectroscopy of adsorbed NO. The Pt/(Pt + Mo) atomic ratio drastically influences the catalytic behavior. The formation of active sites with high activity and an important synergistic effect is enhanced at a very specific low metals composition of the catalysts. The characterization results suggest that the enhanced HDS and HYD activities are due to an improved dispersion of the active species on the support, which was reached at low metal contents and a specific atomic ratio. Moreover, this improved dispersion was influenced by the surface composition of the alumina and could be associated with a specific interaction between the Pt and the hydroxyl groups of the alumina as well as with the formation and distribution of the Mo active phase exposed on the support.

Keywords
Hydrodesulfurization; Hydrotreatment; Platinum-molybdenum; Proton affinity distribution; CO adsorption; NO adsorption
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Role of Pt in high performance Pt-Mo catalysts for hydrotreatment reactions
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 302, Issue 1, 21 March 2006, Pages 118–126
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