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Supported silver catalysts prepared by deposition in aqueous solution of Ag nanoparticles obtained through a photochemical approach

Paper ID Volume ID Publish Year Pages File Format Full-Text
42443 45925 2009 8 PDF Available
Title
Supported silver catalysts prepared by deposition in aqueous solution of Ag nanoparticles obtained through a photochemical approach
Abstract

The preparation of titania and ceria supported silver catalysts through a photochemical approach was here investigated. Ag catalysts were prepared by irradiating at 25 °C and different wavelengths (254 or 300 nm) an aqueous solution of silver acetylacetonate, successively suspending the support, after complete silver photoreduction. Catalytic behaviour and physical properties of these catalysts (LD) were compared with those of Ag samples prepared by conventional techniques, i.e. impregnation (IM) and coprecipitation (CP). Catalysts were characterized by TEM and XRD and tested in the complete oxidation of methanol. Both Ag/TiO2 and Ag/CeO2 samples prepared through the photochemical approach exhibited much higher catalytic activity in the methanol combustion than corresponding IM and CP ones. On the basis of characterization data, the higher activity of the titania supported LD sample was related to the presence of spherical, multiple twinned, highly defective Ag crystallites. In the case of the ceria supported system the better performances of the LD catalyst were explained with the formation of smaller Ag nanoparticles on this sample.

Graphical abstractTitania and ceria supported silver catalysts with high oxidation activity were prepared by deposition in water at room temperature from stable unprotected Ag nanoparticles obtained through a facile photochemical approach. The high activity of so prepared samples was related to the presence of multiple twinned, highly defective Ag crystallites (Ag/TiO2) or very small Ag nanoparticles (Ag/CeO2).Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Catalyst preparation; Liquid phase deposition; Colloids; Nanoparticles; Multiple twinned structures; Methanol oxidation
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Supported silver catalysts prepared by deposition in aqueous solution of Ag nanoparticles obtained through a photochemical approach
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 367, Issues 1–2, 1 October 2009, Pages 138–145
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us