甘露醇-硝酸铝溶液燃烧法制备γ-Al2O3纳米粉体

摘要

以九水硝酸铝，甘露醇和氨水的混合溶液作为前驱体溶液，采用溶液-燃烧法直接焙烧一步合成纳米γ-Al2O3。利用XRD、TEM和N2吸附-脱附等方法对最终形成的氧化铝进行了表征。结果表明，九水硝酸铝与甘露醇物质的量之比为26：15，前驱体溶液的pH值为4，焙烧温度为800℃，焙烧时间为4 h，在此条件下，可制备出蓬松且晶粒尺寸在4~6 nm之间的γ-Al2O3纳米粉体。%Nano-sized γ-Al2O3 power was prepared by solution-combustion method using aluminum nitrate nonahydrate and mannitol as raw materials. XRD,TEM and N2 adsorption were used to characterize the prepared γ-Al2O3 power. The experimental results indicate that nano-sized γ-Al2O3 powers (particle size of 4~6 nm) can be obtained by solution-combustion when the reaction conditions are as follows: the molar ratio of aluminum nitrate nonahydrate to mannitol is 26:15, pH value of the precursor is 4,the calcining temperature is 800℃,the calcining time is 4 h.