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Effect of iron oxide on isobutane dehydrogenation over Pt/Fe2O3-Al2O3 catalyst

Paper ID Volume ID Publish Year Pages File Format Full-Text
41189 45879 2012 7 PDF Available
Title
Effect of iron oxide on isobutane dehydrogenation over Pt/Fe2O3-Al2O3 catalyst
Abstract

The effect of adding Fe2O3 to an Al2O3-supported Pt catalyst on isobutane dehydrogenation was studied. Catalytic activity, catalyst stability, and selectivity to isobutene were improved significantly by adding a small amount of Fe2O3 to Pt/Al2O3. The catalysts were characterized by CO and NH3 chemisorption measurements, Fourier transformed-infrared (FT-IR) analysis of adsorbed CO, and thermogravimatric-differential thermal analysis (TG-DTA) of the used catalyst. FT-IR analysis of the adsorbed CO showed that the electron density of Pt was increased by the formation of bimetallic particles. CO chemisorption suggested the formation of Pt-Fe bimetallic particles partially covered with Fe species. Furthermore, the number of strong acid sites on the Al2O3 surface was decreased by adding Fe2O3. Analysis of the used catalysts suggested that the addition of Fe2O3 inhibited sintering of supported Pt particles. The addition of Sn to Pt/Fe2O3-Al2O3 further improved the dehydrogenation activity of the catalyst. This catalyst showed better catalytic activity than that of Pt-Sn/Zn-Al-O, which has been employed in a commercial process and has been reported as an excellent catalyst in dehydrogenation reactions. We claim that we have developed a novel dehydrogenation catalyst system, Pt-Sn/Fe2O3-Al2O3, which has better catalytic properties than the reported commercial catalyst.

Graphical abstract.Figure optionsDownload full-size imageDownload high-quality image (96 K)Download as PowerPoint slideHighlights► Dehydrogenation of isobutane was remarkably improved by the addition of Fe2O3 to Pt/Al2O3. ► Formation of Pt-Fe particles increased the electron density of Pt, as revealed by FT-IR of CO. ► Addition of Fe2O3 inhibited sintering of supported Pt particles. ► Pt-Sn/Fe2O3-Al2O3 is a novel and excellent dehydrogenation catalyst system.

Keywords
Iron oxide addition; Isobutane dehydrogenation; Pt-Sn catalyst; CO adsorption; Catalyst deactivation
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Effect of iron oxide on isobutane dehydrogenation over Pt/Fe2O3-Al2O3 catalyst
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 417–418, 29 February 2012, Pages 306–312
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