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Comparison of redox isotherms for vanadia supported on zirconia and titania

Paper ID Volume ID Publish Year Pages File Format Full-Text
42448 45926 2009 5 PDF Available
Title
Comparison of redox isotherms for vanadia supported on zirconia and titania
Abstract

Zirconia- and titania-supported vanadia catalysts were characterized by coulometric titration, Raman spectroscopy, and rate measurements for methanol oxidation and propane oxidative dehydrogenation (ODH). Redox isotherms obtained at 748 K by coulometric titration of a titania-supported vanadia catalyst with a loading of 2.9 V/nm2 showed that reduction occurred in a single step at a PO2PO2 of 10−22 atm, corresponding to a ΔG of oxidation of −300 kJ/mol; however, reduction of the sample caused changes in the isotherm obtained during re-oxidation consistent with formation of bulk V2O5, which requires higher PO2PO2 for oxidation. With vanadia-zirconia catalysts, increasing the calcination temperature from 748 to 873 K caused changes in both the Raman spectra and in the 748-K redox isotherm consistent with formation of bulk ZrV2O7. Rate measurements for methanol oxidation and propane ODH on vanadia-titania, vanadia-zirconia, bulk V2O5, and ZrV2O7 showed relatively small differences in specific rates.

Graphical abstractThe thermodynamic redox properties of zirconia- and titania-supported vanadia were characterized by coulometric titration in order to understand the impact that these properties have on methanol oxidation and propane ODH.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Coulometric titration; Vanadia; Titania; Zirconia; Methanol oxidation; Propane oxidative dehydrogenation
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Comparison of redox isotherms for vanadia supported on zirconia and titania
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 361, Issues 1–2, 20 June 2009, Pages 13–17
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