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Water modification of PEG-derived VPO for the partial oxidation of propane

Paper ID Volume ID Publish Year Pages File Format Full-Text
43759 45987 2008 7 PDF Available
Title
Water modification of PEG-derived VPO for the partial oxidation of propane
Abstract

In this study, the PEG-derived VPO precursors were subject to water refluxing (90 °C, 8 h) and in situ activation in a steam-containing environment. For comparison, the VPO precursors without water refluxing were also activated in a similar manner. The IR measurement indicated that the majority of PEG in the precursor has been removed during water refluxing, and the VPO is essentially unenwrapped by PEG. The consequence is an increase of particle size and crystallinity of VPO as well as decreases in surface acidity and site density. The activation of catalysts in a stream-containing environment has an influence on the content of V5+ species and on the reduction behavior of the VPO catalysts. The VPO catalyst activated with 20% water vapor (by volume) in the feed shows the highest crystallinity. Compared with the non-PEG-derived VPO precursor, the PEG-derived one undergoes structure changes of higher severity during the water/steam treatments. The VPO catalyst generated from the PEG-derived precursor with water refluxing and activated with steam (20%) exhibited a propane conversion of 25% and a (AA + HAc) selectivity of ∼70%. The superior catalyst behavior can be interpreted in terms of the higher crystallinity of the (VO)2P2O7 phase, the lower content of V5+ species, and the milder surface acidity as caused by the water/steam treatments.

Graphical abstractThe PEG-derived VPO precursors were subject to water refluxing and in situ activation in a water vapor-containing environment. The resulting effects are correlated to catalytic performance in the partial oxidation of propane to acrylic acid.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Vanadium phosphorus oxide; Propane; n-Butane; Oxidation; Acrylic acid; Maleic anhydride
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Water modification of PEG-derived VPO for the partial oxidation of propane
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 341, Issues 1–2, 15 June 2008, Pages 70–76
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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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