In-situ surface analysis of AuPd(110) under elevated pressure of CO

• Published in: Catalysis today Vol. 260; pp. 39 - 45
• Main Authors: Languille, M.A., Ehret, E., Lee, H.C., Jeong, C.K., Toyoshima, R., Kondoh, H., Mase, K., Jugnet, Y., Bertolini, J.C., Aires, F.J. Cadete Santos, Mun, B.S.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.02.2016; Elsevier
• Subjects: AP-XPS; AuPd alloys; Catalysis; Chemical Sciences; Environment and Society; Environmental Sciences; STM; Catalysis; AuPd alloys; AP-XPS; STM
• ISSN: 0920-5861; 1873-4308
• DOI: 10.1016/j.cattod.2015.05.029

STM images showing surface restructuring due to high CO pressure. •We studied the surface properties of AuPd(110) under elevated pressure of CO.•Under elevated pressure of CO, nano-sized rice-grains forms on AuPd(110) surface.•New adsorption sites of CO are found with the analysis of PM-IRRAS and AP-XPS. With the combination of various in-situ surface science tools, surface chemical and structural properties of bimetallic AuPd(110) alloys are characterized under elevated CO pressure. Under 1Torr of CO gas pressure, STM images show the formation of nano-sized surface rice-grains along the index direction of [1–10] while PM-IRRAS shows new CO vibrational band. This new vibrational band of PM-IRRAS is confirmed as the CO molecules attached to atop site of Pd with the results of ambient pressure XPS. In the case of adsorption of CO on AuPd(110) alloys, the so-called “pressure gap” exists and the surface morphology and its chemical states change at elevated pressure conditions.