Formation of Pd–Ag nanoparticles in supported catalysts based on the heterobimetallic complex PdAg2(OAc)4(HOAc)4
- Authors: Rassolov A.V.1, Markov P.V.1, Bragina G.O.1, Baeva G.N.1, Krivoruchenko D.S.1, Mashkovskii I.S.1, Yakushev I.A.2, Vargaftik M.N.2, Stakheev A.Y.1
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Affiliations:
- Zelinsky Institute of Organic Chemistry
- Kurnakov Institute of General and Inorganic Chemistry
- Issue: Vol 57, No 6 (2016)
- Pages: 859-865
- Section: Article
- URL: https://journal-vniispk.ru/0023-1584/article/view/162902
- DOI: https://doi.org/10.1134/S0023158416060112
- ID: 162902
Cite item
Abstract
The formation of Pd–Ag nanoparticles deposited from the heterobimetallic acetate complex PdAg2(OAc)4(HOAc)4 on α-Al2O3, γ-Al2O3, and MgAl2O4 has been investigated by high-resolution trans-mission electron microscopy, temperature-programmed reduction, and IR spectroscopy of adsorbed CO. The reduction of PdAg2(OAc)4(HOAc)4 supported on γ-Al2O3 and MgAl2O4 takes place in two steps (at 15–245 and 290–550°C) and yields Pd–Ag particles whose average size is 6–7 nm. The reduction of the Pd–Ag catalyst supported on α-Al2O3 occurs in a much narrower temperature range (15–200°C) and yields larger nanoparticles (~10–20 nm). The formation of Pd–Ag alloy nanoparticles in all of the samples is demonstrated by IR spectroscopy of adsorbed CO, which indicates a marked weakening of the absorption band of the bridged form of adsorbed carbon monoxide and a >30-cm–1 bathochromic shift of the linear adsorbed CO band. IR spectroscopic data for PdAg2/α-Al2O3 suggest that Pd in this sample occurs as isolated atoms on the surface of bimetallic nanoparticles, as is indicated by the almost complete absence of bridged adsorbed CO bands and by a significant weakening of the Pd–CO bond relative to the same bond in the bimetallic samples based on γ-Al2O3 and MgAl2O4 and in the monometallic reference sample Pd/γ-Al2O3.
About the authors
A. V. Rassolov
Zelinsky Institute of Organic Chemistry
Email: st@ioc.ac.ru
Russian Federation, Moscow, 119991
P. V. Markov
Zelinsky Institute of Organic Chemistry
Email: st@ioc.ac.ru
Russian Federation, Moscow, 119991
G. O. Bragina
Zelinsky Institute of Organic Chemistry
Email: st@ioc.ac.ru
Russian Federation, Moscow, 119991
G. N. Baeva
Zelinsky Institute of Organic Chemistry
Email: st@ioc.ac.ru
Russian Federation, Moscow, 119991
D. S. Krivoruchenko
Zelinsky Institute of Organic Chemistry
Email: st@ioc.ac.ru
Russian Federation, Moscow, 119991
I. S. Mashkovskii
Zelinsky Institute of Organic Chemistry
Email: st@ioc.ac.ru
Russian Federation, Moscow, 119991
I. A. Yakushev
Kurnakov Institute of General and Inorganic Chemistry
Email: st@ioc.ac.ru
Russian Federation, Moscow, 119991
M. N. Vargaftik
Kurnakov Institute of General and Inorganic Chemistry
Email: st@ioc.ac.ru
Russian Federation, Moscow, 119991
A. Yu. Stakheev
Zelinsky Institute of Organic Chemistry
Author for correspondence.
Email: st@ioc.ac.ru
Russian Federation, Moscow, 119991
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