Mechanochemical Synthesis of Nanocrystalline Nickel–Molybdenum Compounds, Their Morphology and Application in Catalysis: I. Effect of the Ni : Mo Atomic Ratio on the Structure and Properties of Nickel–Molybdenum Compounds Prepared under Mechanochemical Synthesis Conditions

摘要

Mechanochemical activation in high-energy planetary activators was used for the preparation of highly dispersed nickel–molybdenum compounds. Nickel hydroxocarbonate [NiCO_3 · 2Ni(OH)_2 · nH_2O] and ammonium paramolybdate [(NH_4)_6Mo_7O_(24) · 4H_2O] were chosen as starting compounds. The effect of the Ni : Mo atomic ratio on the composition and structure of products formed in the process of mecha- nochemical activation followed by calcination was studied. It was found that, at the Ni : Mo atomic ratios of 1.0 and 1.4, the mechanically activated product after calcination at 520℃ contained 70–100% β-NiMoO_4, which is a stable phase at temperatures lower than 180℃.