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Investigation of ruthenium-copper bimetallic catalysts for direct epoxidation of propylene: A DFT study
Date
2010-09-01
Author
Kizilkaya, Ali Can
Senkan, Selim
Önal, Işık
Metadata
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Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
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Propylene epoxidation reactions are carried out on Ru-Cu(1 1 1) and Cu(1 1 1) surfaces with periodic density functional theory (DFT) calculations. Ru-Cu(1 1 1) surface is modeled as Cu(1 1 1) monolayer totally covering the Ru(0 0 0 1) surface underneath, in accordance with the literature. It is shown that the Ru-Cu(1 1 1) surface is ineffective for propylene oxide formation since it has a lower energy barrier (0.48 eV) for the stripping of the allylic hydrogen of propylene and a higher energy barrier (0.92 eV) towards oxametallacycle formation compared to Cu(1 1 1) surface which has a barrier of 0.83 eV for hydrogen stripping and 0.75 eV for oxametallacycle formation. The reason behind this ineffectiveness is shown to be the higher basicity of the atomic oxygen adsorbed on Ru-Cu(111) compared to Cu(1 11), evaluated by the adsorption of sulfur dioxide onto the systems. The results are consistent both with recent publications about propylene epoxidation and previous studies performed about the structure of Ru-Cu catalysts.
Subject Keywords
Ruthenium
,
Copper
,
Bimetallic catalysts
,
Propylene epoxidation
,
Density functional theory
URI
https://hdl.handle.net/11511/31650
Journal
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
DOI
https://doi.org/10.1016/j.molcata.2010.07.008
Collections
Graduate School of Natural and Applied Sciences, Article