Catalytic Performance of Ag2O and Ag Doped CeO2 Prepared by Atomic Layer Deposition for Diesel Soot Oxidation

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Publikace nespadá pod Filozofickou fakultu, ale pod Přírodovědeckou fakultu. Oficiální stránka publikace je na webu muni.cz.
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IVANOVA Tatiana HOMOLA Tomáš BRYUKVIN Anton CAMERON David Campbell

Rok publikování 2018
Druh Článek v odborném periodiku
Časopis / Zdroj Coatings
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Citace
www http://www.mdpi.com/2079-6412/8/7/237
Doi http://dx.doi.org/10.3390/coatings8070237
Klíčová slova silver oxide; cerium oxide; oxidation; diesel soot; catalysis; ALD
Popis The catalytic behaviour of Ag2O and Ag doped CeO2 thin films, deposited by atomic layer deposition (ALD), was investigated for diesel soot oxidation. The silver oxide was deposited from pulses of the organometallic precursor (hfac)Ag(PMe3) and ozone at 200 °C with growth rate of 0.28 A/cycle. Thickness, crystallinity, elemental composition, and morphology of the Ag2O and Ag doped CeO2 films deposited on Si (100) were characterized by ellipsometry, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), and field emission scanning electron microscopy (FESEM), respectively. The catalytic effect on diesel soot combustion of pure Ag2O, CeO2, and Ag doped CeO2 films grown on stainless steel foil supports was measured with oxidation tests. Nominally CeO2:Ag 10:1 doped CeO2 films were most effective and oxidized 100% of soot at 390 °C, while the Ag2O films were 100% effective at 410 °C. The doped films also showed much higher stability; their performance remained stable after five tests with only a 10% initial reduction in efficiency whereas the performance of the Ag2O films reduced by 50% after the first test. It was concluded that the presence of Ag+ sites on the catalyst is responsible for the high soot oxidation activity.
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