摘要
研究了 N-苯甲酰 -N-苯基羟胺 ( BPHA)类过渡金属络合物在乙苯均相氧化中的催化行为 ,考察了络合物催化剂中心金属离子、配体结构以及添加助剂对络合物催化性能的影响 ,并找到了催化剂、助剂的最佳使用浓度及氧化反应的最适宜温度。结果表明 ,中心金属离子的电子结构对络合物催化性能影响最大 ,其活性顺序为 :Cu( BPHA) 2 >Co( BPHA) 2 >Fe( BPHA) 2>Mn( BPHA) 2 >Ni( BPHA) 2 ,配体结构对催化性能有一定影响 ,配体的芳环上有吸电子基团时 ,催化剂分解氢过氧化物的能力增加 ,主要分解产物为苯乙酮。添加轴配体对氧化反应及催化剂的选择性有较大影响 ,其中含端羟基的非环冠醚类及大环冠醚对氢过氧化物的生成和分解都有加速作用 。
The catalytic properties of transition metal complexes of N benzoyl N phenylhydroxylamines(BPHA) in phenylethane homogenous oxidation were examined. The effects produced by the central metal ion and ligand structure in complexes, as well as by additives, on the catalytic properties of these complexes are investigated. The optimal concentration of catalysts and additives and the suitable temperature for oxidation are discovered. The experimental results show that the electronic structure of central metal ion has a strong effect on the catalytic properties of complexes. The order of activity is Cu(BPHA) 2>Co(BPHA) 2>Fe(BPHA) 2>Mn(BPHA) 2>Ni(BPHA) 2. The oxidation rate of phenylethane can be increased by adding some additives containing oxygen atoms (such as crown ethers and acyclic crown ethers).
出处
《现代化工》
CAS
CSCD
2000年第5期32-34,36,共4页
Modern Chemical Industry
关键词
异羟肟酸
过渡金属络合物
催化氧化
乙苯
催化剂
hydroxamic acid, transition metal complex, catalytic oxidation, phenylethane
