Exposed aluminum ions as active sites on $gamma;-alumina Academic Article uri icon


  • The EPR spectrum of nitric oxide which is weakly adsorbed on -Al2O3 exhibits a strong crystal field gradient and a hyperfine structure due to exposed aluminum ions. Hydrogen sulfide is selectively adsorbed on these exposed aluminum ions, whereas H2O and CO2 are not. The latter may be removed from the aluminum ions by brief evacuation at 25 C. Quantitative results for the poisoning of the 1-butene isomerization reaction and the decrease in the EPR spectrum of NO strongly suggest that the exposed aluminum ions function as active sites for the isomerization reaction. For one sample of alumina the number of such sites is between 1 1012/cm2 as measured from the spin concentration and 5 1013/cm2 as measured from H2S poisoning experiments. 1975.

published proceedings

  • Journal of Catalysis

altmetric score

  • 3

author list (cited authors)


citation count

  • 46

complete list of authors


publication date

  • June 1975