羟胺酸钴配合物催化对二甲苯氧化的研究

Studies on Selected Oxidation of p-Xylene Catalyzed by Hydroxamic Acid Cobalt Complex

利用羟胺酸BPHA(N 苯甲酰基 N 苯基羟胺)钴配合物Co(BPHA)2作催化剂,对对二甲苯液相氧化反应进行了研究.详细考察了反应温度、催化剂浓度、配体浓度、反应时间和轴配体对该催化反应的影响.实验结果表明:当反应温度为125℃、氧气压力为0.5MPa、催化剂浓度为1.0×10-3mol/L、配体与催化剂的摩尔比为2∶1时、添加四甘醇或聚乙二醇作配体,反应2h时对二甲苯转化率可达41～43%、选择性为92%.本研究丰富了二甲苯选择性氧化的内容,并具有一定的工业应用前景.

The catalytic properties of hydroamic acid cobalt complex Co(BPHA)_2 in p-xylene homogenous oxidation were studied. The results indicated that the catalytic activities and selectivities were high under mild reactions without solvents. The conversion and selectivity of p-xylene were respectively 41～43% and 92% under optimal reaction conditions ( T=125 ℃, P=0.5 MPa, [Co]= 1.0×10^(-3) mol/L, ligand: catalyst=2∶1, reaction time 2 h ).