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采用化学合成法——共沉淀还原法,以混合稀土氯化物为原料,合成了MMNi_5(MM为混合稀土金属)及富镧混合稀土-镍金属间化合物。研究了其反应过程及合金的贮氢性能。化学法合成的MMNi_5具有与冶金法不同的表面特性,前者的表面有大量的活性镍存在,它的催化作用可促进氢化反应。MMNi_5随铈含量的增加,镧含量的降低,其氢化物平衡分解压增大。MMNi_x在x=5(相当于Ni含量68wt·％)左右贮氢量最大。MMNi_x氢化物的平衡分解压与镍含量之间有线性关系。
MMNi_5 (MM is a mixed rare earth metal) and lanthanum-rich mixed rare earth-nickel intermetallic compound were synthesized by chemical synthesis-coprecipitation reduction method using mixed rare earth chloride as raw material. The reaction process and hydrogen storage properties of the alloy were studied. The chemical synthesis of MMNi_5 metallurgy with different surface properties, the former surface of a large number of active nickel exists, and its catalytic role can promote the hydrogenation reaction. MMNi_5 with the increase of cerium content, the decrease of lanthanum content, the hydrides equilibrium decomposition pressure increases. MMNi_x has the largest hydrogen storage capacity at x = 5 (equivalent to 68wt% Ni). There is a linear relationship between the equilibrium decomposition pressure of MMNi_x hydride and the nickel content.