Factors determining the chemoselectivity of phosphorus-modified palladium catalysts in the hydrogenation of chloronitrobenzenes

• Published in: Kinetics and catalysis Vol. 58; no. 1; pp. 34 - 45
• Main Authors: Skripov, N. I., Belykh, L. B., Sterenchuk, T. P., Akimov, V. V., Tauson, V. L., Schmidt, F. K.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 2017; Springer Nature B.V
• Subjects: Catalysis; Catalysts; Chemistry; Chemistry and Materials Science; Clusters; Hydrogenation; Liquid phases; Palladium; Phosphides; Phosphorus; Physical Chemistry; Precursors; Surface layers; chloronitrobenzenes; chemoselectivity; palladium–phosphorus catalysts; hydrogenation; X-ray photoelectron spectroscopy
• ISSN: 0023-1584; 1608-3210
• DOI: 10.1134/S0023158417010104

The precursor nature effect on the state of the Pd–P surface layer in palladium catalysts and on their properties in the liquid-phase hydrogenation of chloronitrobenzenes under mild conditions has been investigated. A general feature of the Pd–P-containing nanoparticles obtained from different precursors and white phosphorus at P/Pd = 0.3 (PdCl
2
precursor) and 0.7 (Pd(acac)
2
precursor) is that their surface contains palladium in phosphide form (BE(Pd3
d
5/2
) = 336.2 eV and BE(Р2
р
) = 128.9 eV) and Pd(0) clusters (BE(Pd3d
5/2
) = 335.7 eV). Factors having an effect on the chemoselectivity of the palladium catalysts in chloronitrobenzenes hydrogenation are considered, including the formation of small palladium clusters responsible for hydrogenation under mild conditions.