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Effect of chloride on the sinterization of Au/CeO2 catalysts

Title
Effect of chloride on the sinterization of Au/CeO2 catalysts
Type
Article in International Scientific Journal
Year
2010
Authors
G. Dra¸ić
(Author)
Other
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P. B. Tavares
(Author)
Other
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J. L. Figueiredo
(Author)
FEUP
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Journal
Title: CATALYSIS TODAYImported from Authenticus Search for Journal Publications
Vol. 154
Pages: 293-302
ISSN: 0920-5861
Publisher: Elsevier Science
Indexing
Publicação em ISI Web of Science ISI Web of Science
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Scientific classification
FOS: Engineering and technology > Other engineering and technologies
CORDIS: Physical sciences > Chemistry > Heterogeneous catalysis
Other information
Authenticus ID: P-003-2V1
Abstract (EN): Gold was loaded on commercial CeO2 and on ceria prepared by the solvothermal method (at pK(a) = 8.5 at T = 120, 150 and 220 degrees C, and pK(a) = 26.5 at T = 150 degrees C) by a traditional impregnation method (IMP) and by liquid-phase reductive deposition (LPRD). Activities for CO oxidation were compared and results discussed. Ceria samples prepared by IMP showed up to 1.1 wt.%. chloride present and much lower activity than those prepared by LPRD, which had no residual chloride. Full CO conversion was obtained at similar to 200 degrees C for most LPRD samples, while at that same temperature, for the IMP samples, the conversion varied from 2% (commercial ceria) to 16% (solvothermal ceria prepared at pK(a) = 8.5 and T = 120 degrees C). Sintering of gold was quite evident in all IMP materials, possibly due to the presence of chloride. The commercial CeO2 was the most sensitive to chloride, only achieving full CO conversion at similar to 700 degrees C, thus behaving similarly to the support. This was likely due to the large Au nanoparticle size (up to 400 nm), when compared with the solvothermal ceria (up to 200 nm). LPRD samples had lower particle sizes (ranging from 3 to 50 nm) and contain gold in the oxidic form, while IMP samples showed gold in the reduced form.
Language: English
Type (Professor's evaluation): Scientific
Contact: sonia.carabineiro@fe.up.pt
No. of pages: 10
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