The reactivity of palladium acetate inside a poly(4-vinylpyridine-co-divinylbenzene) polymer is strongly influenced by the establishment of interaction between the palladium precursor and the pyridyl functional group in the polymer. DRIFT spectroscopy and simultaneous XANES-SAXS have been applied to monitor the reactivity of palladium acetate in presence of H2 and CO as a function of temperature. H2 reduces palladium acetate to palladium nanoparticles and acetic acid. The pyridyl groups in the polymer play a vital role both in stabilizing the formed acetic acid (thus allowing its detection by means of DRIFT) and the final palladium nanoparticles, which are extremely small and mono-dispersed. On the contrary, CO does not reduce palladium acetate. Rather, it forms Pd2+-carbonyl adducts, which favor the detachment of the acetate ligands and their thermal degradation. These adducts are well observable by means of SAXS because they

The Pyridyl Functional Groups Guide the Formation of Pd Nanoparticles Inside A Porous Poly(4-Vinyl-Pyridine)

GROPPO, Elena Clara;BORFECCHIA, ELISA;LAZZARINI, ANDREA;LAMBERTI, Carlo;
2015-01-01

Abstract

The reactivity of palladium acetate inside a poly(4-vinylpyridine-co-divinylbenzene) polymer is strongly influenced by the establishment of interaction between the palladium precursor and the pyridyl functional group in the polymer. DRIFT spectroscopy and simultaneous XANES-SAXS have been applied to monitor the reactivity of palladium acetate in presence of H2 and CO as a function of temperature. H2 reduces palladium acetate to palladium nanoparticles and acetic acid. The pyridyl groups in the polymer play a vital role both in stabilizing the formed acetic acid (thus allowing its detection by means of DRIFT) and the final palladium nanoparticles, which are extremely small and mono-dispersed. On the contrary, CO does not reduce palladium acetate. Rather, it forms Pd2+-carbonyl adducts, which favor the detachment of the acetate ligands and their thermal degradation. These adducts are well observable by means of SAXS because they
2015
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http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1867-3899
IR spectroscopy; nanoparticles; palladium; polymers; small angle X-ray scattering; X-ray absorption spectroscopy; Inorganic Chemistry; Organic Chemistry; Physical and Theoretical Chemistry; Catalysis
Groppo, Elena; Agostini, Giovanni; Borfecchia, Elisa; Lazzarini, Andrea; Liu, Wei; Lamberti, Carlo; Giannici, Francesco; Portale, Giuseppe; Longo, Alessandro
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/1531001
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