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 исследований: Материалы для журналаСтатья

42 Цитирования (Scopus)

Выдержка

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
Число страниц7
ЖурналApplied Catalysis B: Environmental
Том103
Номер выпуска3-4
DOI
СостояниеОпубликовано - 5 апр 2011
Опубликовано для внешнего пользованияДа

Отпечаток

Hydrogenolysis
Ethane
ethane
electron spin resonance
luminescence
Paramagnetic resonance
Luminescence
laser
catalyst
Catalysts
Lasers
palladium
Palladium
Hydroxyl Radical
stabilization
Stabilization
probe
Ions
electron
ion

ASJC Scopus subject areas

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

Цитировать

Characterization of active sites of Pd/Al2O3 model catalysts with low Pd content by luminescence, EPR and ethane hydrogenolysis. / Vedyagin, Aleksey A.; Volodin, Alexander M.; Stoyanovskii, Vladimir O.; Mishakov, Ilya V.; Medvedev, Dmitrii A.; Noskov, Alexander S.

В: Applied Catalysis B: Environmental, Том 103, № 3-4, 05.04.2011, стр. 397-403.

Результат исследований: Материалы для журналаСтатья

Vedyagin, Aleksey A. ; Volodin, Alexander M. ; Stoyanovskii, Vladimir O. ; Mishakov, Ilya V. ; Medvedev, Dmitrii A. ; Noskov, Alexander S. / Characterization of active sites of Pd/Al2O3 model catalysts with low Pd content by luminescence, EPR and ethane hydrogenolysis. В: Applied Catalysis B: Environmental. 2011 ; Том 103, № 3-4. стр. 397-403.
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abstract = "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.",
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AU - Vedyagin, Aleksey A.

AU - Volodin, Alexander M.

AU - Stoyanovskii, Vladimir O.

AU - Mishakov, Ilya V.

AU - Medvedev, Dmitrii A.

AU - Noskov, Alexander S.

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N2 - 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.

AB - 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.

KW - Active sites

KW - CO oxidation

KW - EPR

KW - Laser induced luminescence

KW - Pd catalysts

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