Are Au Nanoparticles on Oxygen-Free Supports Catalytically Active?
Научная публикация
| Общее |
Язык:
Английский,
Жанр:
Статья (Full article),
Статус опубликования:
Опубликована,
Оригинальность:
Оригинальная
|
| Журнал |
Topics in Catalysis
ISSN: 1022-5528
, E-ISSN: 1572-9028
|
| Вых. Данные |
Год: 2016,
Том: 59,
Номер: 5-7,
Страницы: 469-477
Страниц
: 9
DOI:
10.1007/s11244-015-0528-0
|
| Ключевые слова |
CO oxidation, Gold nanoparticles, Gold oxide, Strong metal-support interaction, Surface core-level shift, X-ray photoemission spectra |
| Авторы |
Klyushin Alexander Yu.
1
,
Arrigo Rosa
1
,
Youngmi Yi
1
,
Xie Zailai
1
,
Hävecker Michael
1,2
,
Bukhtiyarov Andrey V.
3,4
,
Prosvirin Igor P.
3,4
,
Bukhtiyarov Valerii I.
3,4
,
Knop-Gericke Axel
1
,
Schlögl Robert
1
|
| Организации |
| 1 |
Fritz-Haber-Institute der Max Planck Society, Faradayweg 4-6, 14195 Berlin, Germany
|
| 2 |
Division Solar Energy Research, Helmholtz-Zentrum Berlin fur Materialien und Energie GmbH, Albert-Einstein-Str. 15, 12489 Berlin, Germany
|
| 3 |
Boreskov Institute of Catalysis, Pr. Lavrentieva 5, Novosibirsk 630090, Russia
|
| 4 |
Novosibirsk State University, Piragova str. 2, Novosibirsk 630090, Russia
|
|
Информация о финансировании (1)
|
1
|
Российский научный фонд
|
14-23-00146
|
Gold nanoparticles (Au NPs) on oxygen-free supports were examined using near ambient pressure X-ray photoelectron spectroscopy under CO oxidation conditions, and ex situ using scanning electron microscopy and transmission electron microscopy. Our observations demonstrate that Au NPs supported on carbon materials are inactive, regardless of the preparation method. Ozone (O3) treatment of carbon supports leads oxygen-functionalization of the supports. When subsequently exposed to a CO feed, CO is oxidized by the functionalized sites of the carbon support via a stoichiometric pathway. Microscopy reveals that the reaction with CO does not change the morphology of the Au NPs. In situ XPS reveals that the O3 treatment gives rise to additional Au 4f and O 1s peaks at binding energies of 85.25–85.6 and 529.4–530 eV, respectively, which are assigned to the presence of Au oxide. A surface oxide phase is formed during the activation of Au NPs supported on Au foil by O3 treatment. However, this phase decomposes in vacuum and the remaining low-coordinative atoms do not have sufficient catalytic properties to oxidize CO, so the size reduction of Au NPs and/or oxidation of Au NPs is not sufficient to activate Au.