Abstract
Hydrogen temperature programmed desorption profiles are measured and analyzed for five different nickel catalysts, viz. three nickel-on-silica samples loaded with 0.67, 24.3 and 52.2 wt % nickel, a nickel-on-kaolinite catalyst with 33 wt % nickel, and a Raney nickel catalyst. No important differences between these samples are found with respect to the enthalpies of adsorption of the various types of chemisorbed hydrogen, except for small differences in populations. The enthalpies and entropies of adsorption, the populations and the order of desorption of the various chemisorbed forms are tabulated. Special attention is given to the weak type C chemisorbed hydrogen which desorbs in two separate forms, both first order in coverage. Speculations are presented on the nature of this adsorption and evidence is presented for diatomic pre-dissociative bonding. A striking similarity is found between the hydrogen chemisorption behaviour of nickel, platinum and iridium.
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