摘要
用改进了的溶胶凝胶法新工艺在不同条件下制备出不同结构的纳米粒子 Ａｌ２ Ｏ３ 催化剂。采用在纳米 Ａｌ２ Ｏ３ 催化 作用下苯酐与正辛醇反应生成ｎ Ｄ Ｏ Ｐ增塑剂的方法考察了不同纳米 Ａｌ２ Ｏ３ 的催化活性。结果表明， 由于制备条件对纳米 Ａｌ２ Ｏ３ 前驱体组成结构的影响， 使制得的纳米 Ａｌ２ Ｏ３ 催化性能各异。以 Ｃ 型纳米 η Ａｌ２ Ｏ３ 的催化活性较高。 Ｂ型纳米 γθ Ａｌ２ Ｏ３ 催化剂具有较高的比活性。反应转化率随温度升高而逐渐增大， 而纳米 Ａｌ２ Ｏ３ 催化活性在低温时也随温度升高而增大， 高温时则不明显， 相反， 随反应时间增长， 催化活性急剧下降。
Nanometer particle Al 2O 3 catalysts with different structure were prepared by improved sol gel method.Catalytic activity of different nanometer Al 2O 3 was investigated through reaction of benzoic anhydride and n octyl alcohol to form n DOP on A1 2O 3 catalyst. Influence of reaction temperature and time on conversion and activity was investigated.It was shown that the difference in catalytic property of nanometer Al 2O 3 was caused by the difference in preparation condition,which influenced the composition and structure of precursor of nanometer Al 2O 3 Reaction conversion increases with temperature.Activity of nanometer Al 2O 3 increases with temperature evidently in lower temperature range but unevidently in higher temperature range.At higher temperature the activity decreases rapidly with time.
出处
《工业催化》
CAS
1999年第4期28-31,共4页
Industrial Catalysis
基金
国家自然科学基金
