Heteropoly Acids as Oxidation Catalysts in Synthesis of K-Vitamins
Научная публикация
Общее |
Язык:
Английский,
Жанр:
Статья (Full article),
Статус опубликования:
Опубликована,
Оригинальность:
Оригинальная
|
Журнал |
Journal of Molecular Catalysis A: Chemical
ISSN: 1381-1169
|
Вых. Данные |
Год: 1996,
Том: 114,
Номер: 1-3,
Страницы: 151-160
Страниц
: 10
DOI:
10.1016/S1381-1169(96)00313-5
|
Ключевые слова |
K- vitamins, Mechanism, Mo-V-phosphoric heteropoly acids, Oxidation catalysis, Selectivity, Synthesis |
Авторы |
Matveev K.I.
1
,
Odyakov V.F.
1
,
Zhizhina E.G.
1
|
Организации |
1 |
Институт катализа им. Г.К. Борескова СО РАН
|
|
Mo-V-phosphoric heteropoly acids of the Keggin structure H3 + nPMo12−nVnO40 (HPA-n) and their acidic salts were found to be efficient catalysts for 2-methyl-1-naphthol (MN) oxidation by dioxygen to 2-methyl-1,4-naphthoquinone (menadione, or vitamin K3). The reaction occurs in two steps: (1) HPA-n reduction by MN followed by the product isolation; (2) HPA-n regeneration by dioxygen. For reaction MN + HPA-n, carried out in a two-phase ‘water + organic’ solvent system, it has been studied how the HPA-n composition and reaction conditions affect the HPA-n selectivity and activity. The reaction mechanism and methods of increasing the catalyst selectivity are suggested. The reaction has been used in scope of a new environmentally harmless technology ‘Vikasib’ producing the K-group vitamins.