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Because of the complexity of molybdate solutions often used for catalyst preparation, studies have been carried out to ascertain their solution properties and adsorption behavior as a function of pH, concentration, time, temperature, and the presence of oxalate ligands. It has been shown that the solubility and solution stability of ammonium isopolymolybdates vary as a function of the concentration of molybdenum, the pH of solution, and the NH3/M0O3 molar ratio of the solution. The presence of hydrogen peroxide markedly increases both the solution stability and solubility of the isopolymolybdate anions. Extensive adsorption studies of such solutions onto -203 and silica-aluminas were carried out employing ( 4)2 207, ( 4)ß 7024•4 20 along with their peroxy species, and H2[Mo03C204]•2 20 and its two ammonium salts. The adsorption behavior of these anionic species Is dependent upon the nature and concentration of the complex and upon the time of contact. Spectral characterization has been used to elucidate the interactions occurring in the supported species in the solvated and dried forms.

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