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Effect of Au surface plasmon nanoparticles on the selective CO2 photoreduction to CH4

Paper ID Volume ID Publish Year Pages File Format Full-Text
44957 46386 2015 9 PDF Available
Title
Effect of Au surface plasmon nanoparticles on the selective CO2 photoreduction to CH4
Abstract

•Deposition of small Au NPs quantitatively enhances the photoreduction under UV light of CO2 to C1 and C2 hydrocarbons.•The increase in CH4 production is more than 12 times higher than for bare TiO2.•This enhancement has been addressed to a decrease of the charge recombination rates due to the electron scavenging ability of Au NPs.•Under visible light, Au/TiO2 catalyst shows photoactivity towards H2, CO and CH4 formation.

Various gold-supported TiO2 catalysts (0.5–3.0 wt.%) were prepared by a deposition–precipitation method, and their photocatalytic activity towards CO2 reduction was tested in the gas phase while using H2O as electron donor and UV and visible light as energy sources. CO and H2 are detected as major products in bare TiO2. However, the deposition of small Au nanoparticles (NPs) onto TiO2 was found to quantitatively enhance the reduction of CO2 mainly to methane and C2+ hydrocarbons. Transient absorption spectroscopy was used to correlate the improved CH4 production with an increased charge separation due to the electron transfer between the TiO2 and Au NPs. The amount of Au loaded onto TiO2 was optimized, with 1.0 wt.% showing the highest photocatalytic activity under UV light. Under visible irradiation, H2 and CH4 were identified as the main products, although showing significantly lower productions.

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Keywords
Surface plasmon; Gold nanoparticles; CO2 photoreduction
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Effect of Au surface plasmon nanoparticles on the selective CO2 photoreduction to CH4
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 178, November 2015, Pages 177–185
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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