NaCl-promoted CuO–RuO2/SiO2 catalysts for propylene epoxidation with O2 at atmospheric pressures: a combinatorial micro-reactor study
Author
Kalyoncu, Ş.
Düzenli, D.
Onal, I.
Seubsai, A.
Noon, D.
Senkan, S.
Say, Z.
Vovk, E. I.
Ozensoy, E.
Date
2015Source Title
Catalysis Letters
Print ISSN
1011-372X
Electronic ISSN
1572-879X
Publisher
Springer
Volume
145
Issue
2
Pages
596 - 605
Language
English
Type
ArticleItem Usage Stats
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Abstract
A combinatorial approach is used to investigate
several alkali metals promoted Cu–Ru binary oxide catalysts with improved catalytic performance in the propylene
partial oxidation. 2 %Cu/5 %Ru/c–SiO2 catalyst had the
best yield with high propylene conversion and propylene
oxide (PO) selectivity. Among the promoters screening in
the study, NaCl promotion significantly increased the PO
selectivity accompanied by some attenuation in the total
propylene conversion. It was proposed that binary oxide
catalysts revealed a greater number of exposed catalytically
active adsorption sites as compared to monometallic oxide
counterparts according to XPS and FTIR results. Besides
NaCl addition alters the structure, yielding a significantly
improved PO selectivity without any change in the particle
size of Cu and Ru oxide according to XRD analysis.