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耐高温高表面积氧化铝的制备及性质Ⅱ.La的添加对硫酸铝铵法制高表面Al₂O₃的影响

Preparation Chemistry of Alumina with Large Surface Area and High Temperature Stability Ⅱ. Effect of La on Al₂O₃ Prepared by Decomposition of Aluminium Ammonium Sulfate

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【作者】龚茂初；文梅；高士杰；章洁；林之恩；羊彦衡；陈耀强；许清淮；李孝维；郑林；

【Author】 GONG Maochu 1, WEN Mei 1, GAO Shijie 1, ZHANG Jie 1, LIN Zhi’en 1, YANG Yanheng 1, CHEN Yaoqiang 1, XU Qinghuai 2, LI Xiaowei 2, ZHENG Lin 2 (1 The Faculty of Chemistry, Sichuan University, Chengdu 610064, China; 2 Catalyst Factory, Chemical

【机构】四川大学化学学院!成都610064；四川川化集团公司催化剂厂!成都610301；四川川化集团公司催化剂?；

【摘要】采用硫酸铝铵分解法制得γ Al2 O3 超细粉末 ,系统研究了以 [La(EDTA) ]-为浸渍液时 ,La组分的添加对所得的Al2 O3 热稳定性的影响 .结果表明 ,La组分的适量添加可抑制高温下Al2 O3 微孔的烧结和向α相的转变 ,从而提高氧化铝的热稳定性 ,使氧化铝在高温下保持较大的比表面积 .添加x(La) =1%的样品在 110 0℃焙烧 32h后其比表面积达 98 0m2 / g .还比较了以La(NO3) 3 为浸渍液对硫酸铝铵分解所得的Al2 O3 改性样品热稳定性的影响 ,发现此时La的添加未能提高样品的热稳定性更多还原

【Abstract】 Ultrafine powder γ Al 2O 3 was prepared by decomposition of aluminium ammonium sulfate. The effect of La additive on the thermostability of alumina was studied when it had been impregnated with solution of [La(EDTA)] - complex. The addition of La led to the alumina exhibiting good thermostability and large surface area at high temperature. The thermostability of alumina was improved owing to the inhibition of sintering of micropore and phase transition to α Al 2O 3. The result showed that the surface area of alumina with x (La)=1% was 98 0 m 2/g after calcination at 1?100 ℃ for 32 h. The thermostability of alumina impregnated with La(NO 3) 3 solution was also investigated, and in this case, the addition of La had no positive effect on the thermostability of alumina.更多还原