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Characterisation and long-term usage catalytic properties of (VO)2P2O7/γ-Al2O3 stainless steel coated catalyst in p-cymene oxidation

Paper ID Volume ID Publish Year Pages File Format Full-Text
42234 45916 2010 8 PDF Available
Title
Characterisation and long-term usage catalytic properties of (VO)2P2O7/γ-Al2O3 stainless steel coated catalyst in p-cymene oxidation
Abstract

(VO)2P2O7/γ-Al2O3 catalyst was coated onto a stainless steel plate in order to evaluate the long-term catalytic performance and the (VO)2P2O7 catalyst structure behaviour in liquid phase oxidation of p-cymene in a continuous simulated on-stream test. The stainless steel coated catalyst (containing 11 wt% loading) displayed a slow, yet significant deactivation over an extended reaction period of up to 250 h on-stream testing. Comparable results to the pure (VO)2P2O7 and (VO)2P2O7/γ-Al2O3 supported catalysts with the stainless steel coated catalyst was obtained with tertiary cymene hydroperoxide (TCHP) selectivity in a range of 75–85% giving 20–30% yield at conversions between 25 and 40%. The activity of the stainless steel coated catalyst was only partially regenerated by calcination at 550 °C for 4 h, thereafter it showed a rapid activity drop in further catalytic testing. Powder XRD structural analysis of the used (VO)2P2O7 catalyst after continuous 75 h showed that the catalyst converted back to its precursor, VOHPO4·0.5H2O phase during oxidation reaction. The TGA–MS of the same used catalyst sample showed the loss of higher mass fragments (m/z) at decomposition temperatures of 350–800 °C indicating that considerable poisoning of the catalyst surface occurred during its continuous use.

Graphical abstractThe structure behaviour and catalytic properties of (VO)2P2O7/γ-Al2O3 stainless steel coated catalyst were investigated in liquid phase oxidation of p-cymene. The stainless steel plate coated catalyst showed a comparable activity and selectivity to powder (VO)2P2O7/γ-Al2O3 catalyst for a simulated 250 h on-stream testing. XRD analysis of the used (VO)2P2O7 catalyst after 75 h showed that the catalyst is undergoing structural changes.Figure optionsDownload full-size imageDownload high-quality image (99 K)Download as PowerPoint slide

Keywords
Stainless steel; Vanadium phosphate; Liquid phase oxidation; p-Cymene; Tertiary cymene hydroperoxide
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Characterisation and long-term usage catalytic properties of (VO)2P2O7/γ-Al2O3 stainless steel coated catalyst in p-cymene oxidation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 373, Issues 1–2, 31 January 2010, Pages 132–139
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