Selectivity in catalysis by hydrogen-porous membranes

The methods of controlling a catalyst's selectivity by holding its surface (and in special cases its sub-surface) layer in non-stationary states towards the reagents are discussed. This may be achieved by the use of (a) a membrane catalyst; (b) a fluid bed; (c) a riser reactor; (d) periodical changes of the process parameters or catalyst circulation between the reactor and the regenerator; (e) a chromatographic regime; (f) a self-oscillating or stochastic regime. The membrane catalyst produces a non-stationary state of the catalyst surface more easily than do the other methods and for a longer period of time. This propensity of the membrane catalyst is especially important for small-scale industrial installations and for producing ultrapure substances. The transfer of one reagent through the catalyst, for example through a palladium-based septum, increases the selectivity of the hydrogenation of triple bonds into double bonds and of, say, one double bond in a cyclic diene in comparison with normal hydrogenation by the same catalyst. Selectivity of the hydrogenation is a function of hydrogen content in the membrane catalyst. It is shown that hydrogen atoms extracted from the sub-surface layer of the membrane catalyst participate in the hydrogenation process.

Авторы
Gryaznov V.M. 1 , Slin'ko M.G.2
Редакторы
-
Издательство
-
Номер выпуска
-
Язык
Английский
Страницы
73-78
Статус
Опубликовано
Подразделение
-
Номер
-
Том
72
Год
1981
Организации
  • 1 P. Lumumba Peoples' Friendship University, Moscow, Russian Federation
  • 2 L. Ya. Karpov Institute of Physical Chemistry, Moscow, Russian Federation
Ключевые слова
-
Дата создания
19.10.2018
Дата изменения
19.10.2018
Постоянная ссылка
https://repository.rudn.ru/ru/records/article/record/1513/