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Towards selective catalytic oxidations using in situ generated H2O2

Paper ID Volume ID Publish Year Pages File Format Full-Text
45206 46405 2014 9 PDF Available
Title
Towards selective catalytic oxidations using in situ generated H2O2
Abstract

•Au and Au/Pd bimetallic nanoparticles are useful H2O2 production catalysts.•Ti-species grafted to mesoporous silica can selectively oxidise alkenes using H2O2.•Au/Pd nanoparticles on Ti-modified MPS selectively oxidise alkenes using H2/O2(g).•The most active nanoparticles in H2 + O2 → H2O2 are not the most selective in alkene + H2 + O2 → epoxide.

A series of Ti-modified mesoporous SiO2 materials (SBA-15 and MCF) are prepared, characterised and used as catalysts in the selective epoxidation of a probe alkene (cyclohexene) using H2O2 as an oxidising agent. Similarly, a series of mesoporous SiO2-supported monometallic and bimetallic DMAP-stabilised Au and Pd nanoparticles were prepared, characterised and used as catalysts in the production of H2O2 from dilute H2(g) + O2(g) mixtures.The metallic nanoparticles were then supported on the Ti-modified mesoporous SiO2 and these hybrid materials were characterised and their activities in the selective epoxidation of alkenes in the presence of H2(g) + O2(g) mixtures (where H2O2 would be formed in situ) were studied. The bimetallic Au/Pd nanoparticles (which were most active in the production of H2O2 from H2 and O2) were not the most active or selective in the combined reaction. This was ascribed to the Pd component of the nanoparticles promoting hydrogenation of the probe alkene more rapidly than the formation of H2O2. The selectivity of Au nanoparticles in the presence of H2(g) + O2(g) was higher than that of the same catalysts in the presence of H2O2(aq).

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Keywords
Selective oxidation; Ti catalysts; H2O2 production; Green chemistry
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Towards selective catalytic oxidations using in situ generated H2O2
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 146, March 2014, Pages 258–266
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
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