Au/CeO₂-SBA-15 catalysts for CO oxidation: Effect of ceria loading on physic-chemical properties and catalytic performances

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• 作者：L.F. Liotta^a ; ^{liotta@pa.ismn.cnr.it} ; G. Pantaleo^a ; F. Puleo^b ; A.M. Venezia^a
• 关键词：Au ; SBA-15 ; Defective CeO2 ; Au&ndash ; CeO2 interface ; Au particle size ; CO oxidation ; CO2 and H2O effects
• 刊名：Catalysis Today
• 出版年：2012
• 期刊代码：13_09205861
• 类别：ce
• 出版时间：30 June, 2012
• 卷：187
• 期：1
• 页码：10-19
• 文件大小：1341 K

摘要

In this work gold catalysts supported over SBA-15 with different CeO₂ loadings (5-30 wt%) were prepared, characterized by N₂ physisorption analyses, SAXS, XRD, STEM and XPS techniques and their catalytic performances were evaluated in the CO oxidation, chosen as reaction test. Over a selected catalyst, Au/CeO₂(20 wt%)-SBA-15, the effect of CO₂ and of the mixture (CO₂ + H₂O) on the CO conversion to CO₂ was also evaluated.

Characterizations by SAXS, XRD, STEM and XPS were carried out on selected spent catalysts after CO oxidation.

The results were discussed in terms of relationship between morphological, structural, electronic and catalytic properties as a function of the ceria loading. The CO oxidation activity was strongly affected by gold particle size and gold/ceria interface as well. For gold catalysts supported on ceria-doped SBA-15, the oxygen vacancies in ceria likely act as nucleation sites for gold anchoring and stabilization against sintering. The optimum of the catalytic performances was found for 20 wt%ceria loading, likely due to the optimum synergistic interaction between highly dispersed defective ceria oxide and nanosized gold.