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Ir promotion of TiO2 supported Au catalysts for selective hydrogenation of cinnamaldehyde

Paper ID Volume ID Publish Year Pages File Format Full-Text
49583 46755 2014 5 PDF Available
Title
Ir promotion of TiO2 supported Au catalysts for selective hydrogenation of cinnamaldehyde
Abstract

•Surface Au-Ir alloy were first synthesized on TiO2 supported catalysts•Surface Au-Ir alloy improved H2 activation capacity and consequent enhanced catalytic activity•Electron transfer from Ir to Au resulted in higher selectivity in cinnamaldehyde hydrogenation.

We synthesized Ir-on-Au (Au–Ir) nanoparticles (NPs) using 8–9 nm Au NPs, which had a partial coverage of Ir. Both the studied systems allowed the obtainment of cinnamyl alcohol with high selectivities (> 83%). However, Au–Ir/TiO2 delivered a hydrogenation rate 5 times higher than that of Au/TiO2. The deposition of Ir onto the surface of Au and the presence of surface Au–Ir alloy were confirmed by UV–vis and HRTEM respectively. Moreover. Moreover, the strongly shifted XPS binding energy implyed the electron transfer from Ir to Au, which was believed to be responsible for the enhanced H2 activation capacity of Au.

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Keywords
Bimetallic catalysts; Ir; Au; Surface alloy; Selective hydrogenation
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Ir promotion of TiO2 supported Au catalysts for selective hydrogenation of cinnamaldehyde
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 54, 5 September 2014, Pages 72–76
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
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