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Identification of adsorbed species and surface chemical state on Ag(111) in the presence of ethylene and oxygen studied with infrared and X-ray spectroscopies

DOI: 10.3390/physchem1030020 DOI Help

Authors: Adva Ben Yaacov (Weizmann Institute of Science) , Roey Ben David (Weizmann Institute of Science) , David C. Grinter (Diamond Light Source) , Georg Held (Diamond Light Source) , Baran Eren (Weizmann Institute of Science)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physchem , VOL 1 , PAGES 259 - 271

State: Published (Approved)
Published: November 2021
Diamond Proposal Number(s): 25970

Open Access Open Access

Abstract: Using a combination of two surface-sensitive spectroscopy techniques, the chemical state of the Ag(111) surface and the nature of the adsorbed species in the presence of ethylene and oxygen gases are identified. In the 10 mbar pressure range and 25–200 °C studied here, Ag(111) remains largely metallic even in O2-rich conditions. The only adsorbed molecular species with a low but discernible coverage is surface carbonate, which forms due to further oxidation of produced CO2, in a similar manner to its formation in ambient air on Ag surfaces. Its formation is also pressure-dependent, for instance, it is not observed when the total pressure is in the 1 mbar pressure range. Production of carbonate, along with carbon dioxide and water vapor as the main gas-phase products, suggests that an unpromoted Ag(111) surface catalyzes mainly the undesired full oxidation reaction.

Journal Keywords: ethylene oxidation; Ag(111); x-ray photoelectron spectroscopy; infrared spectroscopy; AP-XPS; PM-IRRAS

Subject Areas: Chemistry

Instruments: B07-C-Versatile Soft X-ray beamline: Ambient Pressure XPS and NEXAFS

Added On: 25/11/2021 09:09


Discipline Tags:

Catalysis Physical Chemistry Chemistry

Technical Tags:

Spectroscopy X-ray Photoelectron Spectroscopy (XPS) Near Ambient Pressure XPS (NAP-XPS)