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以无水三氯化铝和无水氯化镁为主要原料,采用非水解sol-gel法合成了镁铝尖晶石纳米粉体,研究了氧供体种类(分别为无水乙醇、无水异丙醇和无水异丙醚)、加料顺序及凝胶化温度(分别为90、110、130℃)对镁铝尖晶石合成的影响。结果表明:1)以乙醇为氧供体合成镁铝尖晶石的产率高于以异丙醇和异丙醚为氧供体合成镁铝尖晶石的产率;2)先将无水氯化镁加入到氧供体与二氯甲烷的混合溶液中,再加入无水氯化铝的加料顺序有利于镁铝尖晶石的合成;3)凝胶化温度为110℃有利于镁铝尖晶石的合成,干凝胶经900℃煅烧可合成出平均粒径为50 nm左右的高纯镁铝尖晶石纳米粉体。
Magnesium aluminum spinel nano-powders were synthesized by non-hydrolytic sol-gel method using anhydrous aluminum trichloride and anhydrous magnesium chloride as main raw materials. The effects of oxygen donor species (anhydrous ethanol, anhydrous isopropyl Alcohol and anhydrous isopropyl ether), feeding sequence and gelation temperature (90,110,130 ℃, respectively) on the synthesis of magnesium aluminate spinel. The results show that: 1) the yield of synthesizing MgAl 2 O spheres with ethanol as oxygen donor is higher than that of MgO spinel with isopropyl alcohol and isopropyl ether as oxygen donors; 2) Adding into the mixed solution of oxygen donor and methylene chloride and adding the feeding order of anhydrous aluminum chloride is favorable for the synthesis of magnesium aluminate spinel; 3) the gelatinization temperature is 110 DEG C, which is favorable for magnesium aluminate spinel , The high purity magnesium aluminate spinel nanopowder with average particle size of about 50 nm can be synthesized by calcining xerogel at 900 ℃.