Abstract
The I~inetics and mechanism of hydrogen chemisorption on nickel have been investigated repeatedly, and the exL'~tence of different forms of hydrogen chemisorption has been established [i, 2]. It seemed of interest to .~lucidate whether the ratio of the chemisorbed forms depends on the dispersion of nickel. We investigated the chemisorption of hydrogen on a series of Ni--SiO 2 catalysts with Ni crystals from 17 to I00 A using a complex of adsorption and magnetic methods (statistical, induction, and ferromagnetic resonance). IIydrogen is chemisorbed on 17-30 A nickel crystals more strongly (from thermal desorption data), with the partial formation of a hydride form, but less firmly on 30-100 A crystals (according to the reversible ohange in the ferromagnetic resonance signal during hydrogen adsorption and desorption) with the formation of a partially protonated form.
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