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Palladium–silver bimetallic catalysts with improved activity and selectivity for ethylene epoxidation

Paper ID Volume ID Publish Year Pages File Format Full-Text
41647 45895 2011 8 PDF Available
Title
Palladium–silver bimetallic catalysts with improved activity and selectivity for ethylene epoxidation
Abstract

Palladium addition to silver catalysts for ethylene epoxidation increases both catalyst activity and selectivity to ethylene oxide. These results confirm the predictions from density functional theory calculations that Pd–Ag bimetallics should improve selectivity relative to unpromoted silver. The performance of Pd–Ag catalysts is similar to that of Cu–Ag catalysts investigated previously, although the maximum selectivity obtained for the optimum Pd–Ag catalyst in the present study exceeds that achieved with Cu–Ag catalysts. Although there is evidence for greater complexity in the structure of these catalysts than has been incorporated in DFT models, these results provide an important additional example of catalyst identification and design from first principles.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (59 K)Download as PowerPoint slideResearch highlights▶ DFT calculations predict higher ethylene epoxidation selectivity for Pd–Ag catalysts. ▶ Pd–Ag catalysts with 100 ppm Pd show higher measured activity and selectivity. ▶ Performance of Pd–Ag catalysts is similar to Cu–Ag catalysts.

Keywords
Ethylene oxide; Olefin epoxidation; Palladium; Silver; Bimetallic catalysts; Catalyst design; High-throughput reactor
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Palladium–silver bimetallic catalysts with improved activity and selectivity for ethylene epoxidation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 391, Issues 1–2, 4 January 2011, Pages 281–288
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Full-text PDF Download
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