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13C-NMR spectroscopy has been applied to the investigation of the adsorption, binding, and behavior of Fe(CO)5 on HY zeolite (activated at 400 °C). Photochemical and thermal decompositions were followed and led to the identification of different interactions with the surface. A stronger interaction, characterized by a larger charge transfer, is observed for the various Fe(CO)x < 5 moieties present in the course of the photochemical decomposition as compared to the thermally induced process. Highly dispersed and pyrophoric iron can be prepared in this manner.

When MgO powders are impregnated with copper ions dissolved in water, hydrolysis to Mg(OH) 2 takes place. Following decomposition of the latter, considerable loss of surface area occurs with incorporation of Cu 2+ ions in the bulk of MgO, as revealed by ESR spectra. Impregnation with Cu 2+ ions dissolved in organic solvents decreases the amount of Cu 2+ ions incorporated into the bulk of MgO. These observations lead to a method of preparation of high surface area MgO powders with Cu 2+ ions at their surface.