Y Y Tong et al 1994 J. Phys.: Condens. Matter 6 L533 doi:10.1088/0953-8984/6/36/001
Y Y Tong, G A Martin and J J van der Klink
Show affiliationsTheoretical results in the literature for an Rh film indicate that the Fermi level local density of states (EF LDOS) at a fixed (small) distance from the atomic planes increases upon coverage with 1/4 monolayer of atomic Li. This should change the response of the surface to incoming reactants, and might be an important factor in the 'promotion' effect of alkalis in catalysis on transition metals. Experimental data on 195Pt NMR parameters measured on Pt catalysts can, under certain assumptions, be analysed to obtain the average EF LDOS at a given type of Pt site (surface, subsurface, bulk). Such an analysis is applied here to Pt catalysts promoted with alkali salts. It is shown that the average EF LDOS at surface sites increases by 10-15%. At other sites no detectable changes occur.
73.20.At Surface states, band structure, electron density of states
71.20.Be Transition metals and alloys
71.20.Dg Alkali and alkaline earth metals
82.65.+r Surface and interface chemistry; heterogeneous catalysis at surfaces
Condensed matter: electrical, magnetic and optical
Issue 36 (5 September 1994)
Y Y Tong et al 1994 J. Phys.: Condens. Matter 6 L533
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