Raney nickel adsorbed species

The most recent results for hydrogen chemisorbed on Raney nickel by Kelly et aj[ (30) are shown in Fig. 8. The inelastic neutron TOF spectra are taken at 77 K in the energy-loss mode with the background spectrum of the reduced Raney Ni sample after desorption of adsorbed species (Fig. 8(a)) subtracted. Figure 8(b) is the pectrum for a hydrogen monolayer. Features at -120 meV (960 cm-i)and -140 meV (1120 cm-1)are in excellent agreement with previous results of Renouprez et al (28,29). In addition, a peak at 78 meV (624 cm"1) is clearly resolved. 

Inelastic neutron scattering from adsorbed species on Raney nickel. 

INS studies of benzene on nickel [85, 86] and platinum [87] are excellent examples of the use of INS spectroscopy to characterise adsorbed species. Benzene was adsorbed at 300 K by bare Raney nickel (0.8 monolayer benzene). Fig. 7.20, and hydrogen-covered Raney nickel (0.5 monolayer H, 0.4 monolayer benzene). 

The conversion of pyridine into 2-picoline in high yield when it is boiled with a primary alcohol and Raney nickel may be closely related to this method of producing 2,2 -bipyridyl. It has been suggested that the alcohol is a source of carbon monoxide or some related, partially reduced species, which attacks the 2-position of the adsorbed pyridine ... 

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