ISSN:
1662-9779
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Physics
Notes:
Au/CeO2 catalysts prepared by a deposition-precipitation and a co-precipitation methodwere applied to CO oxidation in the absence and presence of hydrogen. The transmission electronmicroscope (TEM), the temperature programmed reduction (TPR), and the X-ray absorption nearedge structure (XANES) were conducted to probe structural and electronic properties of gold. Au2O3was determined to be mainly present when Au/CeO2 was prepared by a deposition-precipitationmethod. However, the metallic gold was observed in a co-precipitated Au/CeO2 catalyst. Au/CeO2containing oxidized gold species, prepared by a deposition-precipitation method, showed thedecreasing CO conversion with a reaction time, which accompanied the reduction of gold fromAu(+3) to Au(0). However, co-precipitated Au/CeO2 showed the stable CO conversion. The effect ofpretreatment condition on CO oxidation was also examined. These results support that Au/CeO2catalyst containing oxidized gold species was superior to Au/CeO2 catalyst containing the metallicgold for CO oxidation. This Au/CeO2 catalyst was also active for the selective CO oxidation in thepresence of hydrogen
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.124-126.1749.pdf
