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Promotional effects of Cu on Pt/Al2O3 and Pd/Al2O3 catalysts during n-butane dehydrogenation

Paper ID Volume ID Publish Year Pages File Format Full-Text
55506 47056 2012 6 PDF Available
Title
Promotional effects of Cu on Pt/Al2O3 and Pd/Al2O3 catalysts during n-butane dehydrogenation
Abstract

The promotional effects of copper on Pt/Al2O3 and Pd/Al2O3 on n-butane dehydrogenation were investigated under atmospheric pressure and a reaction temperature of 500–550 °C. The addition of Cu to 1Pt/Al2O3 catalyst enhanced the stability and C4 selectivity of the catalyst, with the butane conversion remaining unchanged. In addition, the presence of Cu on Pd/Al2O3 catalyst significantly increased the conversion of n-butane. TEM images showed that Cu addition was able to disperse Pt and Pd particles well. However, H2 chemisorption showed that the dispersion of Pt catalyst was decreased following Cu addition, but that of Pd was increased. This indicates that the Pt surface can be partly covered by Cu, whereas the Pd surface cannot. Therefore, the activity of just the Pd catalyst and not the Pt catalyst was enhanced by the addition of Cu. On the other hand, the alloy formation of Pt and Pd with Cu was confirmed using TPR, FTIR-CO chemisorptions and EDX-mapping studies. Cu effect on the stability and C4 selectivity of Pt and Pd catalysts can be enhanced by the alloy formation of Pt and Pd with Cu.

Graphical abstractn-Butane dehydrogenation was performed on the alumina supported catalysts at 500 °C, atmospheric pressure and a GHSV of 18,000 mL/gcat h. It is shown that the promotional effects of Cu were pronounced on Pd catalysts. The additions of Cu to Pt and Pd catalysts enhanced the C4 selectivity on both catalysts.Figure optionsDownload full-size imageDownload high-quality image (189 K)Download as PowerPoint slideHighlights► The addition of Cu to Pt/Al2O3 enhanced C4 selectivity with the conversion unchanged. ► The addition of Cu to Pd/Al2O3 increased the conversion significantly. ► The Cu additions can disperse noble metals well. ► The alloy formation of Cu with Pt and Pd was confirmed by FTIR-CO chemisorptions and EDX-mapping studies.

Keywords
Promotional effects of Cu; Alloy formation; n-Butane dehydrogenation; n-Butenes
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Promotional effects of Cu on Pt/Al2O3 and Pd/Al2O3 catalysts during n-butane dehydrogenation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 185, Issue 1, 20 May 2012, Pages 88–93
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