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Supported gold catalysts in SBA-15 modified with TiO2 for oxidation of carbon monoxide

Paper ID Volume ID Publish Year Pages File Format Full-Text
42108 45911 2010 12 PDF Available
Title
Supported gold catalysts in SBA-15 modified with TiO2 for oxidation of carbon monoxide
Abstract

This contribution describes the effect of SBA-15 support modification with variable quantity of TiO2 (0, 10, 20, 40 and 60 wt%) on the catalytic response of supported gold catalysts in CO oxidation. All gold catalysts were prepared by the deposition–precipitation method. These catalysts were characterized by chemical analysis (ICP), N2 adsorption–desorption isotherms, X-ray diffraction (XRD), UV–vis diffuse reflectance spectroscopy (UV–vis DRS), high resolution transmission electronic microscopy (HRTEM) and X-ray photoelectron spectroscopy (XPS). Catalytic activity was found to increase with the TiO2 loading even though this increase was not lineal: the highest catalytic activity was observed for the catalyst loaded with 10 wt% TiO2. This behavior is explained in terms of the quantity of Au+ species present on the surface of gold particles. In addition, an Au/TiO2 reference sample was prepared and tested in CO oxidation reaction. This Au/TiO2 catalyst exhibited the highest activity due to the higher gold dispersion achieved on the TiO2 substrate. The importance of both Au+ and Au0 species present on the catalysts surface on the performance in the target reaction is discussed.

Graphical abstractA series of gold catalysts active for CO oxidation were prepared in this research. Gold catalysts supported on titania-modified SBA-15 substrate with different TiO2 loadings (0, 10, 20, 40 and 60 wt%) were prepared by the deposition–precipitation method.The experimental results revealed that the surface exposure of the Au+ species and the optimized TiO2 content were the primary factors influencing the activity and stability of Au/(x)TiO2/SBA-15 catalysts.Effect of Ti loading in the reaction of CO oxidation over gold catalysts supported on Ti-free and Ti- modified SBA-15 substrates: CO conversion as a function of the reaction temperature.Figure optionsDownload full-size imageDownload high-quality image (94 K)Download as PowerPoint slide

Keywords
Gold nanoparticles; SBA-15; Titania; CO oxidation
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Supported gold catalysts in SBA-15 modified with TiO2 for oxidation of carbon monoxide
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 375, Issue 1, 26 February 2010, Pages 37–48
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