摘要
首次报道了环己酮肟在Ｂ２Ｏ３／ＺｒＯ２催化剂上的气固相Ｂｅｃｋｍａｎｎ重排反应，结果表明该催化剂具有很高的活性（９７．７％）和ε┐己内酰胺选择性（９７．０％）；用Ｈａｍｍｅｔ指示剂正丁胺滴定法测定了样品的表面酸性质，并与催化活性和选择性进行了关联；用ＸＲＤ谱对催化剂结构进行了表征；
Boron oxide catalysts supported on zirconia have been prepared with boria loading in the range of 0-20%(wt). These materials were used as catalysts for the vapor phase Beckmann rearrangement of cyclohexanone oxime to caprolactam at 573 K. 11%(wt) B 2O 3/ZrO 2 catalyst showed high oxime conversion and high ε caprolactam selectivity. Selectivity to caprolactam was associated with the presence of surface acidic sites of intermediate strength. A correlation was observed between the concentration of these surface sites and the selectivity to caprolactam. The structure of B 2O 3/ZrO 2 catalyst has been characterized by means of X ray diffraction. The results indicated that a well dispersed zirconia boria phase was obtained and B 2O 3 could be dispersed on the surface of zirconia as a monolayer.
出处
《分子催化》
EI
CAS
CSCD
1996年第3期161-164,共4页
Journal of Molecular Catalysis(China)
关键词
环己酮肟
己内酰胺
催化剂
重排反应
氧化锆
Cyclohexanone oxime, ε Caprolactam, B 2O 3/ZrO 2 catalyst, Beckmann rearrangement
