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Influence of the host oxide of sulfated-titania catalysts on partial oxidation methanol reaction

Paper ID Volume ID Publish Year Pages File Format Full-Text
41987 45906 2010 8 PDF Available
Title
Influence of the host oxide of sulfated-titania catalysts on partial oxidation methanol reaction
Abstract

A series of sulfated binary titania-based (MxOy–TiO2–SO42−, Mx = Cr, Mn, Fe, Co or Mo) catalysts were prepared by co-precipitation and tested for partial oxidation of methanol. The structural properties were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The acidic and redox properties were examined using ammonia adsorption calorimetry and temperature-programmed reduction coupled with mass spectrometry (TPR–MS) techniques, respectively. The surface Mx species were essentially 100% dispersed on catalysts, as confirmed by XRD and Raman spectroscopy characterization. XPS results indicated the oxidation state of surface Mx species. In addition, Ti and S species were present in their fully oxidized states for all the samples. The results of ammonia adsorption calorimetry showed a surface reaction between chromium oxide and ammonia. The addition of MxOy host oxide not only enhanced the redox properties of sample TiS but also brought changes in the sulfate reduction process, as investigated by TPR–MS. The best catalytic performance was obtained for sample MoO3–TiO2–SO42− with high activity. Furthermore, the distribution of reaction products was examined to provide information about the surface acidity and redox properties simultaneously.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (80 K)Download as PowerPoint slideResearch highlights▶ SO2 and H2S identification during TPR analysis of sulfated catalysts. ▶ DMM selectivity scale for different sulfated oxide catalysts: VTiS > MoTiS > CrTiS > FeTiS > MnTiS > CoTiS.

Keywords
Supported-titania catalysts; Acidity; Redox character; Ammonia adsorption calorimetry; TPR–MS; Methanol selective oxidation
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Influence of the host oxide of sulfated-titania catalysts on partial oxidation methanol reaction
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 385, Issues 1–2, 15 September 2010, Pages 224–231
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
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Any Questions? feel free to contact us