Active Surface Formation and Catalytic Activity of Phosphorous-Promoted Electrolytic Silver in the Selective Oxidation of Ethylene Glycol to Glyoxal
Научная публикация
| Общее |
Язык:
Английский,
Жанр:
Статья (Full article),
Статус опубликования:
Опубликована,
Оригинальность:
Оригинальная
|
| Журнал |
Applied Catalysis A: General
ISSN: 0926-860X
, E-ISSN: 1873-3875
|
| Вых. Данные |
Год: 2008,
Том: 344,
Номер: 1-2,
Страницы: 142-149
Страниц
: 8
DOI:
10.1016/j.apcata.2008.04.007
|
| Ключевые слова |
Active surface formation, Electrolytic silver catalyst, Ethylene glycol oxidation, Glyoxal, Phosphorous-containing promoter |
| Авторы |
Magaev O.V.
1
,
Knyazev A.S.
1
,
Vodyankina O.V.
1
,
Dorofeeva N.V.
1
,
Salanov A.N.
2
,
Boronin A.I.
2
|
| Организации |
| 1 |
Tomsk State University, Chemical, 36 Lenin Str., 634050 Tomsk, Russia
|
| 2 |
G.K. Boreskov Institute of Catalysis SB RAS, 5 Lavrent’eva pr., 630090 Novosibirsk, Russia
|
|
Информация о финансировании (1)
|
1
|
Совет по грантам Президента Российской Федерации
|
МД-968.2007.3
|
Unpromoted and phosphorus-promoted electrolytic silver catalysts have been investigated in the partial oxidation of ethylene glycol (EG). It was shown that the addition of the phosphorus-containing promoter on the surface of electrolytic Ag catalyst led to 15–20% increase in glyoxal (GO) yield. The formation mechanism of the active P-containing surfaces of silver catalyst as well as polycrystalline Ag foil has been studied by means of X-ray photoelectron spectroscopy (XPS), temperature-programmed desorption (TPD) and scanning electron microscopy (SEM) methods. It was shown that silver clusters located nearby the P-containing Ag surface participate in the ethylene glycol oxidation into glyoxal. The rise of glyoxal selectivity is explained by the absence of low temperature peak at 250 °C in TPD spectra of both P-promoted Ag foil and electrolytic Ag catalysts. This peak was assigned to the decomposition of surface oxide-like species (Ag2sO) responsible for deep oxidation of ethylene glycol.