【摘要】 以组成和结构确定的柠檬酸配合物Mg2NiHcit2·10H2O和MgNiHcitH2O2·8H2OH4cit为柠檬酸为前驱体热分解得到Ni和Mg摩尔比分别为1∶2和2∶1的镍酸镁纯相Mg2NiO3和MgNi2O3。粉末衍射实验证实它们是由半径相近、价态相等的Ni2+和Mg2+形成的固溶体。更多还原

【Abstract】 Nickel-based oxides are catalysts u sed in the partial oxidation,carbon dioxide reforming of methane and fabrication of carbon nanotubes by thermal decomposition of methane.Complexes Mg2[Ni(Hcit)2]·10H2O and Mg[Ni(H2O)2]2·8H2O(H4cit acid)are prepared from the reaction of MgCl2 with the complexes(NH4)4[Ni (Hcit)2]·2H2O and(NH4)2[Ni(Hcit)(H2O)2]·2H2O respectively.The complexes are decomposed to obtain nickel-based oxides Mg 2NiO3and MgNi2O3.XRD patterns of these new phases are close to the pure phases of MgO and NiO,but the dimensions of the lattice parame ters of these new phases are between t hem.This indicates that the solid-solution is formed due to a very good mutual solubility between MgO and NiO.It is deduced that the preparation of mixed oxides by citrate method is related closely with the decomposition of well-characterized citrate nickel?complexes.更多还原