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Multidisciplinary determination of the phase distribution for VOX–ZrO2–SO42−–sepiolite catalysts for NH3-SCR

Paper ID Volume ID Publish Year Pages File Format Full-Text
55687 47062 2011 5 PDF Available
Title
Multidisciplinary determination of the phase distribution for VOX–ZrO2–SO42−–sepiolite catalysts for NH3-SCR
Abstract

A series of V2O5–ZrO2–SO42−–sepiolite mixtures were extruded, calcined and characterised. NH3-SCR activity was found to be related to the content of the active VOX–ZrO2–SO42− phase (VSZ). The distribution of sepiolite and VSZ at the surface of the mechanical mixtures was studied by the electrophoretic migration technique. The samples were further characterised by nitrogen adsorption, NH3-TPD, XRD and scanning electron micrography techniques. The electrophoretic migration results showed that the addition of sepiolite to VSZ, by kneading in water, had a dramatic effect on the quantity of VOX–ZrO2–SO42− present at the support's surface, both strongly decreasing the molar fraction of zirconia at the surface, and altering the electrophoretic properties of the mixtures.The SEM micrographs, XRD patterns and activity measurements of the water-kneaded samples supported the electrophoretic migration results. Furthermore, it was verified by electrophoretic migration experiments that up until a composition of 75% VOX–ZrO2–SO42−, the sepiolite fibers coats the zirconia particles. This has a slightly negative influence on the overall SCR activity of fresh catalysts.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (187 K)Download as PowerPoint slideHighlights► Pore size design by variations of clay content. ► Clay shielding of active phase in conformed catalyst. ► Precise prediction of morphology by zero point charge measurements. ► Deviation of apparent activation energy due to induced diffusion limitations.

Keywords
ZrO2–SO42−; Sepiolite; SCR; Vanadium; Phase distribution; Zeta potential
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Multidisciplinary determination of the phase distribution for VOX–ZrO2–SO42−–sepiolite catalysts for NH3-SCR
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 172, Issue 1, 25 August 2011, Pages 73–77
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