An XPS and UPS Study of the Kinetics of Carbon Monoxide Oxidation over Ag(111)

An XPS and UPS Study of the Kinetics of Carbon Monoxide Oxidation over Ag(111) Научная публикация

Журнал

Surface Science
ISSN: 0039-6028

Вых. Данные

Год: 1982, Том: 118, Номер: 3, Страницы: 369-386 Страниц : 18 DOI: 10.1016/0039-6028(82)90194-7

Авторы

Felter T.E. ¹ , Weinberg W.H. ¹ , Lastushkina G.Ya. ² , Boronin A.I. ² , Zhdan P.A. ² , Boreskov G.K. ² , Hrbek J. ³

Организации

1	Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA
2	Institute of Catalysis, Academy of Sciences of the USSR, Novosibirsk, 630090, USSR
3	J. Heyrovsky Institute of Physical Chemistry and Electrochemistry, Czechoslovakia Academy of Sciences, Vinohrady, Czechoslovakia

The oxidation of carbon monoxide over a Ag(111) catalyst has been studied by XPS and UPS. The kinetics have been determined over the temperature range of 180 to 400 K and found to be of the Langmuir-Hinshelwood type, although the Eley-Rideal mechanism is mimicked. A negative activation energy, −1.7 kcal/mole, and a preexponential, 6 × 10−18 cm2, are found. The former corresponds to the difference in the activation energies for carbon monoxide desorption and for carbon monoxide oxidation (leading to CO2 desorption). At 90 K, upon carbon monoxide exposure to the active oxygen precovered surface, the O ls and C ls spectral regions show the formation of CO2-like and carbonate species; the latter is stable to at least room temperature. That is, at 90 K, the residence time and mobility of CO2 formed at the surface permits a new surface reaction — the formation of stable surface carbonate. The identifications are based on C and O coverages and on line positions from the literature for Cu/CO2 and several bulk carbonates. With UPS, the 1πg, the unresolved doublet 1πg and 3σg, and the 4σg molecular orbitals of adsorbed CO2-like species are identified, as well as the unresolved triplet 1α′2, 1e″ and 4e′ and the unresolved triplet 3e′, 1α″2 and 4a′ molecular orbitals of the carbonate species. Surface CO2-like species formed by surface oxidation of CO seem to be more strongly bound than reversibly adsorbed CO2.

Felter T.E. , Weinberg W.H. , Lastushkina G.Y. , Boronin A.I. , Zhdan P.A. , Boreskov G.K. , Hrbek J.
An XPS and UPS Study of the Kinetics of Carbon Monoxide Oxidation over Ag(111)
Surface Science. 1982. V.118. N3. P.369-386. DOI: 10.1016/0039-6028(82)90194-7 WOS Scopus РИНЦ CAPlusCA OpenAlex Sciact

Поступила в редакцию:	22 окт. 1981 г.
Принята к публикации:	23 мар. 1982 г.
Опубликована в печати:	2 июн. 1982 г.
Опубликована online:	18 сент. 2002 г.

Web of science:	WOS:A1982NY43000002
Scopus:	2-s2.0-49049130914
РИНЦ:	31006406
Chemical Abstracts:	1982:479636
Chemical Abstracts (print):	97:79636
OpenAlex:	W2061196437
Sciact:	14533

БД	Цитирований
OpenAlex	59