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Effect of oxidation states of vanadium precursor solution in V2O5/TiO2 catalysts for low temperature NH3 selective catalytic reduction

Paper ID Volume ID Publish Year Pages File Format Full-Text
54474 47010 2014 7 PDF Available
Title
Effect of oxidation states of vanadium precursor solution in V2O5/TiO2 catalysts for low temperature NH3 selective catalytic reduction
Abstract

•We prepared V2O5/TiO2 catalysts for SCR reaction by changing vanadium precursor solution with different oxidation states (3+, 4+ and 5+).•V2O5/TiO2 produced with V3+ precursor solution demonstrates high NOx conversion and low N2O formation.•V2O5/TiO2 produced with V3+ precursor produced highly coordinated polymeric vanadyl species.

In this study, we aimed at finding the optimum condition to prepare V2O5/TiO2 catalyst for the selective catalytic reduction with NH3 (NH3-SCR) by changing oxidation states in vanadium precursor solution. Using three precursor solutions with different oxidation states (V3+, V4+ and V5+), TiO2 supported V2O5 catalysts (1, 3, 5 and 7 wt%) were prepared by applying wet impregnation method. We utilized various analytical techniques, such as N2 adsorption–desorption with BET method, inductively coupled plasma (ICP), X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), UV–visible diffuse reflectance spectroscopy (UV–Vis DRS) and temperature programmed reduction with hydrogen (H2 TPR) to investigate the physicochemical properties of V2O5/TiO2 catalysts. In addition, the SCR reactivity of these catalysts was evaluated to obtain a structure-activity relationship. It was found that V2O5/TiO2 catalysts prepared from the precursor solution of V3+ oxidation state (VT(3+)) has good activity over wide temperature range and selective to N2 production, respectively. Also, they produced the least amount of N2O during SCR reaction, which is beneficial from the view point of greenhouse gas emission. The superiority of low temperature Such desirable reaction behavior of the VT(3+) catalyst is attributed to the formation of highly coordinated polymeric vanadyl species on the sample.

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Keywords
V2O5/TiO2; Oxidation state; Vanadium precursor; DeNOx; NH3-SCR
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Effect of oxidation states of vanadium precursor solution in V2O5/TiO2 catalysts for low temperature NH3 selective catalytic reduction
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 232, 1 September 2014, Pages 185–191
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