Adsorption isotherms at 25° from methanol solution on a previously studied activated carbon have been determined for the following acetylacetonate (AA) complexes: CO(III)(AA)3, Fe(III)(AA)3, Al(AA)3, Cu(II)(AA)2, Pt(AA)2, and Pd(AA)2. The adsorption isotherms of the platinum, palladium, and cobalt complexes have in addition been determined on a graphitized carbon black. Analysis of the results by application of the Polanyi theory indicates a striking weakening of the adsorption of the octahedral complexes relative to that of the planar complexes; the effect is ascribed to the pronounced steric inability of the octahedral complexes to achieve close approach to the presumably planar adsorbent surfaces. The similarity of the results on both the activated carbon and on the graphitized carbon black demonstrates that the effect is to be distinguished from molecular sieving.
All Science Journal Classification (ASJC) codes
- Physical and Theoretical Chemistry