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Structure and properties of bifunctional catalysts based on zirconia modified by tungsten oxide obtained by polymeric precursor method

Paper ID Volume ID Publish Year Pages File Format Full-Text
43013 45951 2008 7 PDF Available
Title
Structure and properties of bifunctional catalysts based on zirconia modified by tungsten oxide obtained by polymeric precursor method
Abstract

Bifunctional catalysts of Pt/WOx–ZrO2 (PWZ) type with 1 wt% of Pt and 10, 15 and 20 wt% of tungsten were synthesized by polymeric precursor method and after they were calcined at 600, 700 and 800 °C. The structural and textural properties of the catalysts were by X-ray diffraction (XRD), Fourier-transformed infrared spectroscopy (FTIR), N2 adsorption measurement, temperature programmed reduction by derivative thermogravimetry (TPR–DTG) and transmission electron microscopy (TEM). X-ray diffractogram revealed the presence of tetragonal ZrO2 and platinum (Pt) as the main phases. The infrared spectra of the catalysts showed bands due O–W–O and WO bonds. The catalysts showed specific surface area values in the range of 30–160 m2 g−1. TPR profile showed reduction peaks at high temperatures that were related with the reduction of WOx species. Such catalysts were active in the n-heptane isomerization with high selectivity to branched product.

Graphical abstractBifunctional catalysts of Pt/WOx–ZrO2 (PWZ) type with 1 wt% of Pt and 10, 15 and 20 wt% of tungsten were synthesized by polymeric precursor calcined at 600, 700 and 800 °C and characterized by several techniques. Such catalysts were active in the n-heptane isomerization with high selectivity to branched product.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Synthesis; Zirconia; Tungsten oxide; n-Heptane isomerization
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Structure and properties of bifunctional catalysts based on zirconia modified by tungsten oxide obtained by polymeric precursor method
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 342, Issues 1–2, 30 June 2008, Pages 56–62
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