Correlation between Metal Particle Size and Reaction Mechanisms

Correlation between Metal Particle Size and Reaction Mechanisms [Pg.72]

Isomerization and Hydrogenolysis of Hexanes AND Pentanes on Platinum-Alumina [Pg.72]

As already pointed out, the first particle size effect in skeletal rearrangement was found for the hydrogenolysis of methylcyclopentane (55). Nonselective hydrogenolysis takes place on highly dispersed catalysts, with a metal loading smaller than 0.6%, while selective rupture of bisecondary C-C bonds occurs on heavily loaded catalysts (more than 6% platinum on alumina). [Pg.72]

The particle size effect in the case of supported platinum catalysts prepared from chloroplatinic acid was questioned by Dautzenberg and Platteeuw (131), who claimed that the difference of behavior between the 0.2% and the [Pg.73]

More recently, it was found that the hydroxylation state of the alumina has a determining influence upon the particle size of platinum crystallites. Controlled dehydroxylation of the alumina proved to be the most reliable method for preparing stable catalysts with gradual variations of the dispersion, and a continuous series of Pt/Al2O3 catalysts with dispersions (characterized by the H/Pt ratio) ranging from 0.04 to 1.0 was prepared by [Pg.74]

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