Characterization of active sites of Pd/Al2O3 model catalysts with low Pd content by luminescence, EPR and ethane hydrogenolysis

Aleksey A. Vedyagin, Alexander M. Volodin, Vladimir O. Stoyanovskii, Ilya V. Mishakov, Dmitrii A. Medvedev, Alexander S. Noskov

Результат исследования: Материалы для журналаСтатья

42 Цитирования (Scopus)

Аннотация

Spectroscopic (laser-induced luminescence (LIL) and EPR) and catalytic (ethane hydrogenolysis) techniques were used for characterization of the active sites of Pd/Al2O3 catalysts. These techniques have high sensitivity and make it possible to study the catalysts with Pd concentrations as low as 0.02-0.03wt.%. It was found by EPR using spin probes that the electron donor sites of the support are modified by the deposited palladium. It was found by LIL that the Pd deposition has a substantial effect on the state of hydroxyls on the Al2O3 surface. The obtained results indicate that at Pd concentrations 0.5wt.% or lower supported Pd does not form PdO phase. Instead, it is stabilized in the form of atomically dispersed ion clusters. The possible role of the Al2O3 donor sites in stabilization of such clusters is discussed.

Язык оригиналаАнглийский
Страницы (с... по...)397-403
Количество страниц7
ЖурналApplied Catalysis B: Environmental
Том103
Номер выпуска3-4
DOI
Статус публикацииОпубликовано - 5 апр 2011
Опубликовано для внешнего пользованияДа

    Fingerprint

ASJC Scopus subject areas

  • Catalysis
  • Environmental Science(all)
  • Process Chemistry and Technology

Цитировать