Alteration of the Physicochemical Properties of Catalysts Based on Aqueous Solutions of Mo-V-P Heteropoly Acids in Redox Processes
Научная публикация
| Общее |
Язык:
Английский,
Жанр:
Статья (Full article),
Статус опубликования:
Опубликована,
Оригинальность:
Оригинальная
|
| Журнал |
Reaction Kinetics and Catalysis Letters
ISSN: 0133-1736
, E-ISSN: 1588-2837
|
| Вых. Данные |
Год: 2008,
Том: 95,
Номер: 2,
Страницы: 301-312
Страниц
: 12
DOI:
10.1007/s11144-008-5423-2
|
| Ключевые слова |
Homogeneous catalysts, solutions of Mo-V-P heteropoly acids, physicochemical properties |
| Авторы |
Zhizhina Elena G.
1
,
Odyakov Viktor F.
1
|
| Организации |
| 1 |
Boreskov Institute of Catalysis
|
|
Selective catalytic oxidation of various organic substrates with O2 in the presence of aqueous solutions of Mo-V-P heteropoly acids (HPA) is carried out via two stages in separate reactors. In stage (1), a substrate is oxidized into a desired product while HPA is reduced. The reduced form of HPA is oxidized with O2 in stage (2). A set of the physicochemical properties of the homogeneous catalyst has been found to alter continuously during these redox processes. Using a solution of the modified high-vanadium HPA (H12P3Mo18V7O85), we demonstrate that the density, viscosity, and pH of this solution reach their maxima after reaction (1) and attain their minima after reaction (2). On the contrary, the redox potential of the solution is minimum after reaction (1), and maximum after reaction (2). All alterations of the physicochemical properties of the catalyst are found to be completely reversible.