Cyclohexane dehydrogenation on a copper-platinum catalyst

The reaction of the dehydrogenation of cyclohexane on a copper-platinum catalyst supported by silica gel (1 wt % Pt + 0.15 wt % Cu)/SiO 2 was studied. The state of the catalyst surface was investigated using X-ray photoelectron spectroscopy. It was established that under both flow and static conditions, the activity of the copper-platinum catalyst is higher than the activity of a catalyst containing 1 wt % Pt/SiO 2. The rise in activity as a result of the introduction of copper, due to a decrease in the activation energy, is explained by an increase in the fraction of carbon in the composition of active centers localized on particles of neutral (Pt m 0 ) and positively charged (Pt n +δ ) platinum, and by the formation of centers with increased activity as a result of the adsorption of Cu +δ on particles of Pt m 0 . It was demonstrated that treating the copper-platinum catalyst with the plasma of a glow discharge in argon and oxygen increases its activity, while treatment in high-frequency H 2 plasma reduces it. The indicated changes in the activity are associated with the alteration of the activation energies and the number of active centers, revealed by X-ray photoelectron spectroscopy, that depend on changes in the catalyst surface composition. © 2010 Pleiades Publishing, Ltd.

Авторы
Galimova N.A. 1 , Pskhu Z.V. 1 , Naumkin A.V.2 , Volkov I.O.2 , Yagodovskaya T.V. 3 , Platonov E.A. 1 , Yagodovskii V.D. 1
Редакторы
-
Издательство
-
Номер выпуска
11
Язык
Английский
Страницы
1908-1912
Статус
Опубликовано
Подразделение
-
Номер
-
Том
84
Год
2010
Организации
  • 1 Peoples Friendship University of Russia, ul. Miklukho-Maklaya 6, Moscow 117198, Russian Federation
  • 2 A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, ul. Vavilova 28, Moscow 119991, Russian Federation
  • 3 Department of Chemistry, Moscow State University, Moscow 119991, Russian Federation
Ключевые слова
Active center; Catalyst surfaces; Cyclohexane dehydrogenation; High frequency HF; Number of active centers; Platinum catalysts; Positively charged; Static conditions; Activation energy; Adsorption; Argon; Copper; Cyclohexane; Dehydrogenation; Glow discharges; Oxygen; Photoelectricity; Photons; Platinum; Silica; Silica gel; Silicon compounds; X ray photoelectron spectroscopy; Catalyst activity
Дата создания
19.10.2018
Дата изменения
19.10.2018
Постоянная ссылка
https://repository.rudn.ru/ru/records/article/record/2696/