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

作者：Liotta L F^*; Pantaleo G; Puleo F; Venezia A M

来源：Catalysis Today, 2012, 187(1): 10-19.

DOI：10.1016/j.cattod.2012.01.001

• Au
• SBA-15
• Defective CeO2
• Au-CeO2 interface
• Au particle size
• CO oxidation
• CO2 and H2O effects

In this work gold catalysts supported over SBA-15 with different CeO2 loadings (5-30 wt%) were prepared, characterized by N-2 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. %26lt;br%26gt;Characterizations by SAXS, XRD, STEM and XPS were carried out on selected spent catalysts after CO oxidation. %26lt;br%26gt;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.

• 出版日期2012-6-30