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Thermal stability and catalytic activity of flame-made silica–vanadia–tungsten oxide–titania

Paper ID Volume ID Publish Year Pages File Format Full-Text
48616 46515 2007 8 PDF Available
Title
Thermal stability and catalytic activity of flame-made silica–vanadia–tungsten oxide–titania
Abstract

Vanadia (0.9 or 2 wt.%) and silica (0–5 wt.%) doping of flame-made tungsten oxide–titania nanostructured catalyst powders (anatase, 100 m2/g, 10 wt.% WO3) is investigated. The effect of dopants on structural and chemical properties of these powders were analyzed by nitrogen adsorption, X-ray diffraction (XRD), temperature programmed reduction (TPR), transmission electron microscopy (TEM) and Raman spectroscopy. After calcination for 20 h at 700 °C in air, the thermally most stable composite powder conserved its specific surface area (SSA) to 90 m2/g and its anatase content to 96 wt.%. Tungsten oxide and vanadia form thin polymeric layers (∼1 nm) on the surface of the titania support. Adding silica improves the thermal and crystal stability of the catalysts even at higher reactor temperatures. As a result both NO conversion and the rate of selective catalytic reduction (SCR) with NH3 were increased.

Keywords
Flame spray pyrolysis; DeNOx; Titania; Tungsten oxide; Vanadia; Silica
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Thermal stability and catalytic activity of flame-made silica–vanadia–tungsten oxide–titania
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 69, Issues 3–4, 15 January 2007, Pages 181–188
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
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