Journal
CATALYSIS LETTERS
Volume 95, Issue 1-2, Pages 57-59Publisher
KLUWER ACADEMIC/PLENUM PUBL
DOI: 10.1023/B:CATL.0000023722.50580.e8
Keywords
hydrogenation; palladium; nanoparticles; montmorillonite; carbon disulfide; poisoning; styrene
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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 = 1:2. High-coordination terrace sites are not involved in the hydrogenation reaction.
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