Mechanochemical Synthesis of Nanocrystalline Nickel-Molybdenum Compounds and Their Morphology and Application in Catalysis: II. Effect of Mechanochemical Activation Parameters--Process Power Density and Exposure Time--on the Composition and Structure of Nickel-Molybdenum Compounds

摘要

The effect of mechanochemical activation parameters--process power density and the time of treatment of a mixture of nickel hydroxocarbonate NiCO_3 · 2Ni(OH)_2 · nH_2O and ammonium paramolybdate (NH_4)_6Mo_7O_(24) · 4H_2O --on the phase composition, specific surface area, and morphology of mechanically activated products at different Ni: Mo atomic ratios was studied. It was found that, at a mechanochemical activation process power density of 6.2 W/g, layered transition metal molybdates (LTM compounds) with different amounts of crystal water were the constituents of the products, whereas the products mechanically activated at a power density of 28.0 W/g contained a mixture of LTM compounds and heteropoly compounds with the Anderson structure regardless of activation time.