Adsorption–Structural Characteristics of Aluminum Powder Modified with Manganese Formiate

Nitrogen adsorption onto the ASD-4 aluminum and modified ASD-4-2% Mn powders was measured experimentally at 78 K. The results of a study of adsorption–structural features of interactions of ultradispersive aluminum with manganese formiate, including morphology and phase composition of reaction products, were presented; the specific surface area and porosity of the powders were calculated. The peculiarities of the adsorption isotherms observed for the studied samples before and after modification were discussed with regard to their matching to a certain type according to the recommendations of the International Union of Pure and Applied Chemistry, as well as to a certain type of porosity, which was necessary to understand the scope of their further application. The adsorption isotherm observed for the modified powder corresponds to a type specific for mesoporous solids. It was shown that both the structure of the adsorbent and its aggregate state determined the shape and type of adsorption isotherm. The introduction of the modifier increased the adsorption capacity of the aluminum powder. The specific surface of the modified powder increased up to 20 m2/g, whereas before modification the specific surface of the ASD-4 powder was 0.7 m2/g.