Oxidation of Benzene to Phenol by Nitrous Oxide: Activity of Iron in Zeolite Matrices of Various Composition
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: 2002,
Том: 227,
Номер: 1-2,
Страницы: 143-157
Страниц
: 15
DOI:
10.1016/S0926-860X(01)00932-2
|
| Ключевые слова |
Alpha-oxygen, Fe-ZSM-5, Nitrous oxide, Oxidation of benzene, Phenol, ZSM-5 (B, Al, Ga, Ti) |
| Авторы |
Pirutko L.V.
1
,
Chernyavsky V.S.
1
,
Uriarte A.
2
,
Panov G.I.
1
|
| Организации |
| 1 |
Boreskov Institute of Catalysis, Novosibirsk 630090, Russia
|
| 2 |
Solutia Inc., P.O. Box 97, Gonzales, FL 32560-0097, USA
|
|
Catalytic properties of Fe introduced in the pentasil type zeolite matrices of various composition (B-ZSM-5, Al-ZSM-5, Ga-ZSM-5, Ti-ZSM-5) have been studied. All the matrices were shown to be inert in the title reaction. However, upon iron introduction they may serve as a basis for the development of very active and selective catalysts. The amount of iron needed for this purpose depends dramatically on the matrix composition: Al-ZSM-5 and Ga-ZSM-5 zeolites exhibit high activity even in the presence of 0.01–0.03 wt.% Fe, while B-ZSM-5 and Ti-ZSM-5 zeolites need a 10–100 times more Fe.
The distinctions in zeolite activity relate to the fact that the formation of Fe-containing α-sites, catalyzing the reaction, strongly depends on the Brönsted acidity and proceeds with different efficiency in various matrices. But being formed, α-sites in their catalytic performance have only slight dependence on the matrix composition. Activity of B-ZSM-5, Al-ZSM-5, and Ti-ZSM-5 zeolites is described by a common dependence on the concentration of α-sites, revealing their identity in these matrices. In Ga-ZSM-5 matrix, α-sites exhibit a two to three times higher activity. The role of Fe admixtures in the literature disagreement on the origin of zeolite activity is discussed.