CS2 poisoning of size-selective cubooctahedral Pd particles in styrene hydrogenation

• Published in: Catalysis letters Vol. 95; no. 1-2; pp. 57 - 59
• Main Authors: KIRALY, Zoltan, VEISZ, Bernadett, MASTALIR, Agnes
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer 01.05.2004; Springer Nature B.V
• Subjects: Atomic properties; Carbon disulfide; Catalysis; Chemistry; Colloidal state and disperse state; Coordination; Crystallites; Ethylbenzene; Exact sciences and technology; General and physical chemistry; Hydrogenation; Liquid phases; Montmorillonite; Nanoparticles; Palladium; Physical and chemical studies. Granulometry. Electrokinetic phenomena; Poisoning; Poisons; Stoichiometry; Styrenes; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Clay; Hydrocarbon; Montmorillonite; Nanoparticle; Palladium; Hydrogenation; Particle; nanoparticles; Carbon disulfide; poisoning; Styrene; Benzenic compound; Platinoid
• ISSN: 1011-372X; 1572-879X
• DOI: 10.1023/B:CATL.0000023722.50580.e8

The poisoning effect of carbon disulfide on cubooctahedral palladium nanoparticles (1.5, 3.0 or 4.6 nm in mean diameter) deposited on montmorillonite was investigated in the liquid-phase hydrogenation of styrene to ethylbenzene under mild conditions. The dispersion of the metal crystallites was computed as a function of the mean diameter in terms of face atoms, of edge atoms + corner atoms, and of the total number of exposed surface atoms. A linear relationship was found between the rate of hydrogenation and the fraction of low-coordination surface sites poisoned, independently of particle size, and hydrogenation ceased when these sites were quantitatively covered by poison molecules with a nominal stoichiometry of CS2:Pd = l:2. High-coordination terrace sites are not involved in the hydrogenation reaction.