摘要
采用ＩＲ和ＸＲＤ技术研究了Ｂ２Ｏ３／ＺｒＯ２催化剂的结构性质，用ＩＣＰ－ＭＳ测定了样品中Ｂ２Ｏ３的含量，通过Ｈａｍｍｅｔ指示剂正丁胺滴定法测定了Ｂ２Ｏ３／ＺｒＯ２系列催化剂的表面酸性；研究了载体预处理温度对样品表面酸性和结构的影响，以及Ｂ２Ｏ３含量对样品催化性能的影响；比较了Ｂ２Ｏ３负载于ＺｒＯ２，Ａｌ２Ｏ３，ＳｉＯ２，ＴｉＯ２，ＭｇＯ和ＨＺＳＭ－５上催化活性和目的产物选择性的差异。
Boron oxide catalysts supported on zirconia were prepared with B 2O 3 loading of 0￣20%. These materials were used as catalysts for vapor phase Beckmann rearrangement of cyclohexanone oxime (CHO) to caprolactam at 300℃. The structure of B 2O 3/ZrO 2 catalysts was characterized by means of XRD and IR. The acidity and acid strength of the samples were determined by n butylamine titration using Hammett indicators. A correlation was observed between the concentration of the surface acidic sites with intermediate strength and the selectivity for caprolactam. The feature of ZrO 2 support was realized when the catalytic performance of B 2O 3/ZrO 2 was compared with that of B 2O 3/Al 2O 3, B 2O 3/SiO 2, B 2O 3/TiO 2, B 2O 3/MgO and B 2O 3/HZSM 5. The effect of boron oxide addition was discussed.
出处
《催化学报》
CSCD
北大核心
1996年第6期512-516,共5页
关键词
氧化锆
负载型
催化剂
环己酮肟
重排反应
Boron oxide
Zirconia
Supported catalyst
Cyclohexanone oxime
Beckmann rearrangement
Caprolactam
