Palladium nanoparticles heterogeneous nucleation within organically grafted silica foams and their use as catalyst supports toward the Suzuki–Miyaura and Mizoroki–Heck coupling reactions

• Published in: Applied catalysis. A, General Vol. 390; no. 1; pp. 51 - 58
• Main Authors: Ungureanu, S., Deleuze, H., Babot, O., Achard, M.-F., Sanchez, C., Popa, M.I., Backov, R.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 20-12-2010; Elsevier
• Subjects: Catalysis; Catalysts; Chemical Sciences; Chemistry; Colloidal state and disperse state; Cycles; Emulsions; Emulsions. Microemulsions. Foams; Exact sciences and technology; Foams; General and physical chemistry; Hybrid materials; Inorganic chemistry; Joining; Material chemistry; Nanoparticles; Nucleation; Palladium; Physical and chemical studies. Granulometry. Electrokinetic phenomena; Silica; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Foams; Nanoparticles; Catalysis; Silica; Hybrid materials; Binary compound; Catalytic reaction; Nanoparticle; Hybrid material; Heterogeneous nucleation; Heck reaction; Transition metal; Palladium; Heterogeneous catalysis; Emulsion; Foam; Platinoid; Catalyst; Catalyst support
• ISSN: 0926-860X; 1873-3875
• DOI: 10.1016/j.apcata.2010.09.025

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▶ Palladium nanoparticles have been heterogeneously nucleated within hybrid organic–inorganic foams. ▶ The new as-synthesized “Pd@organo-Si(HIPE)” open-cell catalysts have been tested for the Suzuki–Miyaura and Mizoroki–Heck coupling reactions. ▶ Thiphenylphosphine (PPh
3) is favouring nanoparticles stabilization and activation. ▶ The catalysts Pd@gMercapto-Si(HIPE)-P4 and Pd@g3Amino-Si(HIPE)-P4 under addition of (PPh
3) are offering high yields, turnover and cycling performances for the Mizoroki–Heck coupling reaction.
Palladium nanoparticles supported within hybrid organic–inorganic foams have been generated. The as-synthesized catalysts, labeled “Pd@gOrgano-Si(HIPE)” (high internal phase emulsion), have been tested with or without addition of triphenylphosphine (PPh
3), considering both the Suzuki–Miyaura and Mizoroki–Heck coupling reactions. Particularly, the catalysts Pd@gMercapto-Si(HIPE)-P4 and Pd@g3Amino-Si(HIPE)-P4 under addition of (PPh
3) in a molar ratio 4:1 relative to palladium, are offering good yields, turnover and cycling performances for the Mizoroki–Heck coupling reaction.