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SBA-15-supported gold nanoparticles decorated by CeO2: Structural characteristics and CO oxidation activity

Paper ID Volume ID Publish Year Pages File Format Full-Text
42026 45908 2010 12 PDF Available
Title
SBA-15-supported gold nanoparticles decorated by CeO2: Structural characteristics and CO oxidation activity
Abstract

The influence of SBA-15 substrate modified with CeO2 on the catalytic response of supported gold catalysts in the CO oxidation reaction was investigated. The mesoporous CeO2/SBA-15 materials (5, 10, 15 and 20 wt% of CeO2) were prepared by incipient wetness impregnation of synthesized SBA-15 substrate whereas the supported gold catalysts were prepared by deposition–precipitation method. The dried Au/SBA-15 and Au/CeO2/SBA-15 catalysts were characterized by elemental analysis (EDX), 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) and their catalytic activity was investigated by the temperature-programmed CO oxidation reaction performed in temperature range 26–205 °C. Catalytic activity was found to increase with the CeO2 loading even though this increase was not linear: the highest catalytic activity was observed for the catalyst loaded with 10 wt% CeO2. This result was explained in terms of the combined effects of the higher stability of gold particles on the support. It was found that the Au nanoparticles in the CeO2/SBA-15 substrates could be stabilized more efficiently than those on Ce-free SBA-15 material. For the Ce-containing catalysts, a superior performance of the Au/10%CeOx/SBA-15 catalyst was related to multiple factors such as (i) highest dispersion of Au species on the support surface (by XPS and HRTEM), (ii) highest surface exposure of the Auδ+ species (by XPS), and (iii) probably a synergetic effect between the gold nanoparticles and the CeO2 nanoparticle size (by XRD, UV–vis and HRTEM).

Graphical abstractA series of Au catalysts supported on SBA-15 substrate modified with variable amounts of CeO2 (0, 5, 10, 15 and 20 wt%) were prepared by the deposition–precipitation method. Catalytic activity was found to increase with the CeO2 loading even though this increase was not linear: the highest activity was found for the catalyst loaded with 10 wt% CeO2. This behavior is explained in terms of the quantity of Au+ species present on the surface of catalysts. The importance of both Au+ and Au0 species on the catalytic performance in the target reaction is discussed.Figure optionsDownload full-size imageDownload high-quality image (119 K)Download as PowerPoint slide

Keywords
Gold nanoparticles; Gold catalysts; CeO2/SBA-15 supports; CO oxidation
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SBA-15-supported gold nanoparticles decorated by CeO2: Structural characteristics and CO oxidation activity
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 381, Issues 1–2, 15 June 2010, Pages 42–53
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
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Online Support
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