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Surface acid–basic properties of WOx–ZrO2 and catalytic efficiency in oxidative desulfurization

Paper ID Volume ID Publish Year Pages File Format Full-Text
47507 46474 2009 8 PDF Available
Title
Surface acid–basic properties of WOx–ZrO2 and catalytic efficiency in oxidative desulfurization
Abstract

The dependence between catalytic activity of WOx–ZrO2 system in the oxidation of dibenzothiophene (DBT) and its relationship with local acidity has been explored experimentally and theoretically. The structural requirements indicate that the oxidative efficiency (per W-atom) increases as the WOx surface density becomes larger, up to 7 W/nm2. These results strongly suggest that n-meric domains and/or WO3−x nanoparticles (NPs) anchored to surface are more reactive than monomeric and three-dimensional structures and that WOx domains of intermediate size provide the better compromise between surface acidity and catalytic efficiency. The experimental results suggest that catalytic efficiency is favored by the increasing of Brönsted acidity density. The theoretical analysis reveals that the combined presence of Lewis and Brönsted sites energetically favored the formation of peroxometallate complexes and that OOH addition reaches its maximum for minimum (non-zero) number of Lewis sites and maximum number of Brönsted sites.

Keywords
Tungstated zirconia; Brönsted and Lewis acidity; Surface acids; Dibenzothiophene; Oxidation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 92, Issues 1–2, 19 October 2009, Pages 1–8
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
You save - $31
Price after discount Only $4.95
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Full-text PDF Download
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