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나노물질 및 화학반응 연구단
나노물질 및 화학반응 연구단
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Deactivation of Ru Catalysts under Catalytic CO Oxidation by Formation of Bulk Ru Oxide Probed with Ambient Pressure XPS

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Title
Deactivation of Ru Catalysts under Catalytic CO Oxidation by Formation of Bulk Ru Oxide Probed with Ambient Pressure XPS
Author(s)
Kamran Qadir; Sun Mi Kim; Hyungtak Seo; Bongjin S. Mun; Funda Aksoy Akgul; Zhi Liu; Jeong Young Park
Publication Date
2013-06
Journal
JOURNAL OF PHYSICAL CHEMISTRY C, v.117, no.25, pp.13108 - 13113
Publisher
AMER CHEMICAL SOC
Abstract
The surface science approach of using model catalysts in conjunction with the development of in situ spectroscopic tools, such as ambient pressure X-ray photoelectron spectroscopy (AP-XPS), offers a synergistic strategy for obtaining a substantially better understanding of deactivation phenomena. In this study, we investigated the nature of Ru oxides on a Ru polycrystalline film under oxidizing, reducing, and catalytic CO oxidation reaction conditions. Thus, bulk Ru oxide was easily formed on such Ru catalysts, the growth of which was dependent on reaction temperature. Once formed, such an oxide is irreversible and cannot be completely removed even under reducing conditions at elevated temperatures (200 °C). Our reaction studies showed substantial deactivation of the Ru film during catalytic CO oxidation, and its activity could be partially recovered after reduction pretreatment. Such continuous deactivation of a Ru film is correlated with irreversibly formed bulk Ru oxide, as shown by AP-XPS. Such in situ spectroscopic evidence of the transition of oxides to a catalytically inactive state can enable more effective design of catalysts with less deactivation.
URI
https://pr.ibs.re.kr/handle/8788114/1309
ISSN
1932-7447
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > Journal Papers (저널논문)
Files in This Item:
30_IBS CA1301_J of Physical Chemistry C_117_25_13108.pdfDownload

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