壳聚糖接枝四（对羧基苯基）钴卟啉对氧化乙苯的催化作用

摘要

To investigate the catalytic performance of chitosan grafted cobalt tetra ( p-carboxylphe-nyl) porphyrin( Co TCPP-CTS) , Co TCPP-CTS was prepared by an acylation and was characterized by UV-Vis, FT-IR spectra, X-ray diffraction ( XRD) pattern, thermoanalyser ( TG) and transmis-sion electron microscope ( TEM) . The material was used as a catalyst for oxidation of ethylbenzene. The experimental results show that under the optimal oxidation conditions(140 ℃ and 0.8 MPa) , a quantity of the catalyst containing 0.3 mg of Co TCPP Cl could be recycled for 4 times.On average, the ethylbenzene conversation rate, the selectivity ( acetophenone and phenylethanol) and the yield (acetophenone and phenylethanol) are 10.4%, 85.6% and 8.6%, respectively, indicating that the catalyst material contains the original activity of the cobalt porphyrin and can be efficiently recy-cled,and chitosan is a good support for protecting and promoting the cobalt porphyrin for the cataly-sis of ethylbenzene oxidation.%为研究壳聚糖接枝四(对羧基苯基)钴卟啉( Co TCPP)的催化性能,采用酰化反应方法制备了壳聚糖接枝四(对羧基苯基)钴卟啉(Co TCPP-CTS)催化材料,用紫外可见光谱仪(UV-vis)、傅里叶变换红外光谱仪(FT-IR)、X射线扫描仪(XRD)、热重分析仪(TG)和透射电镜(TEM)技术对其进行表征,并用于催化空气氧化乙苯研究。催化结果表明：在最佳反应条件下(140℃,0.8 MPa),含有0.3 mg的Co TCPP Cl的壳聚糖固载四(对羧基苯基)钴卟啉可以重复催化4次,反应时间2.5 h,乙苯转化率平均为10.4%,醇酮选择性平均为85.6%,醇酮产率平均为8.86%。这说明此催化材料保持了原有Co TCPP Cl的催化活性,并能高效重复使用。壳聚糖是一种良好的载体,在催化反应过程中对金属卟啉有良好的保护和促进作用。