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Operando synchronous DRIFTS/MS/XAS as a powerful tool for guiding the design of Pd catalysts for the selective oxidation of alcohols

Paper ID Volume ID Publish Year Pages File Format Full-Text
54931 47032 2013 10 PDF Available
Title
Operando synchronous DRIFTS/MS/XAS as a powerful tool for guiding the design of Pd catalysts for the selective oxidation of alcohols
Abstract

The selective aerobic oxidation of crotyl alcohol to crotonaldehyde was investigated by time-resolved synchronous DRIFTS/MS/XAS over silica and alumina supported Pd nanoparticles. Alcohol and oxygen reactant feeds were cycled through the catalyst bed while dynamic measurements of the palladium oxidation state, molecular adsorbates and evolved product distribution were made simultaneously on a sub-second timescale. Highly dispersed palladium nanoparticles remained in a partially oxidised state <100 °C, independent of the redox environment, and were selective for crotonaldehyde formation. Higher temperatures facilitated rapid catalyst reduction on exposure to crotyl alcohol, with palladium metal driving crotonaldehyde decarbonylation to propene and CO, while slower (surface diffusion-limited) re-oxidation on exposure to oxygen re-opened selective oxidation pathways. Surface palladium oxide is identified as the desired active species.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (320 K)Download as PowerPoint slideHighlights► Multi-dimensional, operando study of dynamic catalyst restructuring during alcohol oxidation. ► Palladium oxidation state responds to composition and temperature of reaction environment. ► Surface palladium oxide catalyses the aerobic selective oxidation of crotyl alcohol.

Keywords
Palladium; Selective oxidation; Operando; XAS; Mesoporous supports
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Operando synchronous DRIFTS/MS/XAS as a powerful tool for guiding the design of Pd catalysts for the selective oxidation of alcohols
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 205, 30 April 2013, Pages 76–85
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
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Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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