fulltext.study @t Gmail

Designing nanoscopic, fluxional bimetallic Pt–Ru alloy hydrogenation catalysts for improved sulfur tolerance

Paper ID Volume ID Publish Year Pages File Format Full-Text
55656 47060 2011 8 PDF Available
Title
Designing nanoscopic, fluxional bimetallic Pt–Ru alloy hydrogenation catalysts for improved sulfur tolerance
Abstract

Supported Pt and Ru mono- and bimetallic alloy catalysts, with promising potential applications in biomass processing, were investigated for their tolerance to sulfur poisoning using the batch hydrogenation of cyclohexene to cyclohexane in the presence of thiophene as a screening reaction. Compared to their monometallic counterparts, the bimetallic catalysts exhibited higher turnover frequencies, both in the absence and presence of sulfur. XRD analysis of changes in the Pt unit cell size suggest that the observed restructuring of the metal nanoparticles results from increasing amounts of sulfur species being coordinated to the ruthenium during poisoning, leading to at least a partial separation of the alloy. However, regeneration of the catalyst in pure H2 at 300 °C shows this to be a reversible process. The sulfur tolerance observed for catalysts with certain Ru to Pt ratios might be due to sulfur and hydrogen intra-particle spillover.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (178 K)Download as PowerPoint slideHighlights► Supported Pt and Ru mono- and bimetallic alloy catalysts were successfully prepared. ► Alloyed catalysts exhibited high TOFs, both in the absence and presence of sulfur. ► XRD analysis gives evidence of alloy separation during the poisoning process. ► The de-alloying process is reversible at elevated temperatures in H2.

Keywords
Catalysis; Metal nanoparticles; Sulfur poisoning
First Page Preview
Designing nanoscopic, fluxional bimetallic Pt–Ru alloy hydrogenation catalysts for improved sulfur tolerance
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
Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 178, Issue 1, 15 December 2011, Pages 164–171
Authors
, , , , ,
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