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Effect of reduction method on the activity of Pt–Sn/SiO2 for dehydrogenation of propane

Paper ID Volume ID Publish Year Pages File Format Full-Text
54453 47010 2014 7 PDF Available
Title
Effect of reduction method on the activity of Pt–Sn/SiO2 for dehydrogenation of propane
Abstract

•The activities of the Pt–Sn/SiO2 catalysts were strongly influenced by the reduction method.•The Pt–Sn/SiO2 (DR) showed the highest activity among the Pt–Sn/SiO2 catalysts tested.•Pt3Sn alloy acts as active site for dehydrogenation of propane, whereas PtSn alloy shows low or no activity.

The effect of reduction method (direct reduction (DR), decomposition in inert gas (DI) and calcination-reduction (CR)) on the catalytic performances of Pt–Sn/SiO2 catalyst in the dehydrogenation of propane was investigated. The Pt–Sn/SiO2 (DR) showed the highest activity among the catalysts tested. The order of activities of Pt/SiO2 and Pt–Sn/SiO2 catalysts was Pt/SiO2 (DR) ≦ Pt–Sn/SiO2 (CR) < Pt–Sn/SiO2 (DI) < Pt–Sn/SiO2 (DR). The results of structural characterization by X-ray diffraction (XRD), CO pulse, transmission electron microscopy (TEM), and Pt LIII and Sn K-edges X-ray absorption fine structure (XAFS) spectroscopy indicated that Pt3Sn alloy nanoparticle was mainly formed on the Pt–Sn/SiO2 (DR). In the case of the Pt–Sn/SiO2 (CR) catalyst, PtSn alloy particle was mainly dispersed on SiO2. On the other hand, Pt metal particles and highly dispersed SnO2 were present on the Pt–Sn/SiO2 (DI). The relationship between activity and structure of platinum-tin catalysts suggested that Pt3Sn alloy acts as active site for dehydrogenation of propane, whereas PtSn alloy shows low or no activity.

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Keywords
Platinum-tin alloy; Dehydrogenation; Propane; Direct reduction; XAFS
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Effect of reduction method on the activity of Pt–Sn/SiO2 for dehydrogenation of propane
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 232, 1 September 2014, Pages 33–39
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
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Price after discount Only $4.95
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Online Support
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