粘土鉱物およびシリカアルミナに吸着した Mn^<2+>, Cu^<2+> の ESR

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ESR spectra were obtained for Mn^<2+> and Cu^<2+> adsorbed on a few clay minerals, coprecipitated silica-aluminagel and synthetic silica-alumina cracking catalyst. The Mn^<2+> spectra on almost adsorbents in moist state or after drying in air were more similar to that of aqueous solution rather than that of powder, for fine structure was not observed. But in comparison with the aqueous solution, the linewidths of hyperfine structure on adsorbents were broader, even though the amount present on adsorbents was alittle and the dipole-dipole interaction attributable to broadening was neglected. So it is a ssumed that the hydrated Mn ions on adsorbents move freely in the surface layer, but the motion of ions are restricted a little and the rotational time is slower than in dilute aqueous solution. Silica-aluminagel is most remarked for the linewidth broadening, montmorillonite next, kaolin and ,silica-alumina catalyst are much lesser. On the Cu^<2+> spectra, montmorillonite showed the similar spectra to aqueous solution, but Other adsorbents had each own pattern. To explain this reason, we assumed there were two kinds of adsorbed state which the absorption peak appeared at different magnetic fields, and composited the new absorption curves by combining two absorption curves in proper ratio. These curves were compared with the observed spectra. As a result, it may be considered that the motion of Cu^<2+> on silica-aluminagel and silica-alumina catalyst are more restricted than on montmorillonite and kaolin.
日本粘土学会の論文
1969-11-20

粘土鉱物およびシリカアルミナに吸着した Mn^<2+>, Cu^<2+> の ESR

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