X-Ray Absorption and Photoemission Studies of the Active Oxygen for Ethylene Epoxidation over Silver

X-Ray Absorption and Photoemission Studies of the Active Oxygen for Ethylene Epoxidation over Silver Научная публикация

Журнал

Catalysis Letters
ISSN: 1011-372X , E-ISSN: 1572-879X

Вых. Данные

Год: 2001, Том: 74, Номер: 3-4, Страницы: 121-125 Страниц : 5 DOI: 10.1023/A:1016666021405

Авторы

Bukhtiyarov V.I. ¹ , Hävecker M. ² , Kaichev V.V. ¹ , Knop-Gericke A. ² , Mayer R.W. ² , Schlögl R. ²

Организации

1	Boreskov Institute of Catalysis, Lavrentieva prosp., 5, 630090 Novosibirsk, Russia
2	Fritz-Haber-Institut der MPG, Faradayweg 4-6, D-14195 Berlin (Dahlem), Germany

Activation of clean polycrystalline silver by a C2H4 + O2 reaction mixture has been studied by XANES, XPS, and UPS. In situ monitoring of the O K-edge XAS spectrum of the pre-treated silver surface revealed a broad signal at 10–20 eV above the threshold. The comparison of the X-ray absorption spectra with O 1s and valence band photoemission data allowed us to attribute this XAS signal to “electrophilic” oxygen (Eb(O 1s) = 530.4 eV) which is known to be active in ethylene epoxidation. The complete absence of XAS features in the photon energy range typical for π* and σ* transitions of molecular oxygen (530–535 eV) indicates both the atomic origin of the electrophilic oxygen and the absence of molecular species on the catalyst surface under the present reaction conditions.

Bukhtiyarov V.I. , Hävecker M. , Kaichev V.V. , Knop-Gericke A. , Mayer R.W. , Schlögl R.
X-Ray Absorption and Photoemission Studies of the Active Oxygen for Ethylene Epoxidation over Silver

Catalysis Letters. 2001. V.74. N3-4. P.121-125. DOI: 10.1023/A:1016666021405 WOS Scopus РИНЦ CAPlusCA OpenAlex Sciact

Полный текст от издателя

Поступила в редакцию:	11 дек. 2000 г.
Принята к публикации:	1 мая 2001 г.
Опубликована в печати:	1 июл. 2001 г.

Web of science:	WOS:000170704900003
Scopus:	2-s2.0-0035412662
РИНЦ:	13384659
Chemical Abstracts:	2001:658914
Chemical Abstracts (print):	135:373231
OpenAlex:	W1538489011
Sciact:	9381

БД	Цитирований
Scopus	48
OpenAlex	48