拟薄水铝石结构对γ-氧化铝水热稳定性的影响  

Effect of pseudo-boehmite structure on hydrothermal stability of γ-Al_2O_3

作　　者：李翠[1] 刘化章[1] 陈珍珍[1] 李瑛[1] 

机构地区：[1]浙江工业大学工业催化研究所,浙江杭州310032

出　　处：《工业催化》2014年第10期751-755,共5页Industrial Catalysis

基　　金：国家自然科学基金(20803064)资助项目;浙江省自然科学基金(4090348)资助项目

摘　　要：氧化铝作为常用工业催化剂载体,其水热稳定性对催化剂寿命起至关重要作用。采用N2吸附、扫描电镜、X射线衍射、傅里叶红外光谱和NH3-TPD等对拟薄水铝石经800℃(升温速率10℃·min-1)焙烧4 h得到的氧化铝及水热处理后的氧化铝结构进行表征,研究拟薄水铝石结构对γ-Al2O3水热稳定性的影响。结果表明,拟薄水铝石前驱体结晶程度越好,焙烧所得γ-Al2O3的表面羟基越少,酸性越弱,水热稳定性越好。Aluminum oxide has been widely used as the support for industrial catalysts, and its hydrothermal stability plays a critical role in the catalyst lifetime. The effect of pseudo-boehmite structure on hydrothermal stability of γ-Al203 obtained from pseudo-boehmite after calcination at 800 ℃ （heating rate 10 ℃ · min -1 ） for 4 h was investigated. The structure of alumina before and after hydrothermal treatment was characterized by N2 adsorption-desorption, SEM, XRD, FF-IR and NH3-TPD. The results showed that the hydrothermal stability of γ-Al2O3 was determined by the crystallity of pseudo-boehmite. The well crystallized γ-Al2O3 with fewer hydroxyl and weak acidity exhibited higher hydrothermal stability compared with poor crystal- lized one.

关 键 词：催化化学 拟薄水铝石 Γ-氧化铝 水热稳定性 

分 类 号：TQ426.6[化学工程] O643.36[理学—物理化学]