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On the nature of active sites in MoVTeO and MoVTeNbO catalysts: The influence of catalyst activation temperature

Paper ID Volume ID Publish Year Pages File Format Full-Text
41626 45895 2011 10 PDF Available
Title
On the nature of active sites in MoVTeO and MoVTeNbO catalysts: The influence of catalyst activation temperature
Abstract

MoVTeO and MoVTeNbO catalysts have been prepared, characterized (by XRD, Raman, IR, XPS, oxygen isotopic-exchange and IR of adsorbed methanol) and tested in the partial oxidation of propane to acrylic acid. The catalysts have been prepared hydrothermally and heat-treated at 500, 550 or 600 °C in a N2 atmosphere. The heat-treatment has different influence on the formation and stability of M1, the surface characteristics of catalysts and the catalytic behavior of MoVTeO and MoVTeNbO catalysts. The more selective catalyst was the MoVTeNbO sample heat-treated at 600 °C, which present relatively high oxygen isotopic-exchange, the lower onset temperature of 18O2-consumption and a very low number of acid sites. In addition, it is characterized by the presence of only a type of Mo6+ species and the absence of Te6+ species (only Te4+ is observed) on the catalyst surface. The characteristics of active and selective catalysts are also discussed.

Graphical abstractMoVTeO and MoVTeNbO catalysts, prepared hydrothermally and heat-treated at 500, 550 or 600 °C in a N2 atmosphere, have been characterized and tested in the partial oxidation of propane to acrylic acid. The heat-treatment has different influence on the formation and stability of M1, the surface characteristics and the catalytic behavior of MoVTeO and MoVTeNbO.Figure optionsDownload full-size imageDownload high-quality image (123 K)Download as PowerPoint slide

Keywords
Mo–V–Te–Nb oxide catalyst; M1; M2; Partial oxidation of propane; Acrylic acid; Catalyst characterization; Hydrothermal synthesis
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On the nature of active sites in MoVTeO and MoVTeNbO catalysts: The influence of catalyst activation temperature
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 391, Issues 1–2, 4 January 2011, Pages 92–101
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
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Any Questions? feel free to contact us