摘要
为了进一步研究壳聚糖固载四(p-磺酸基苯基)钴卟啉催化氧化乙苯的性能,将四(p-磺酸基苯基)钴卟啉通过离子键接枝壳聚糖制备高分子催化材料Co TPPSO3-H3+N-CTS,用紫外可见光谱(UV-Vis)、傅里叶红外光谱(FT-IR)、X-射线衍射技术(XRD)、差热分析技术(TG)和透射电镜技术(TEM)对该催化材料进行结构表征,并研究其催化氧气氧化乙苯的作用。结果表明,在较优的温度(140℃)和氧气压力(0.8 MPa)反应条件下,用含有1 mg Co TPPSO3H的固载催化材料可重复使用催化氧化乙苯8次,其平均乙苯转化率为17.7%,苯乙醇和苯乙酮的选择性为76.4%,相应的醇酮产率为13.5%,催化剂转化数为3.62×105。这表明壳聚糖通过离子键接枝和氨基配位固载的四(p-磺酸基苯基)钴卟啉不仅具有较好的催化性能,还提高了金属卟啉的重复使用催化效率。
In order to study the catalysis of chitosan-supported cobalt tetrakis( p-sulphophenyl) por-phyrin for oxidation of ethylbenzene, the cobalt tetrakis( p-sulphophenyl) porphyrin [ Co TPPSO3 H] was immobilized on chitosan[ CTS] by ionic bond and axial ligand interaction. The catalytic material [ Co TPPSO3-H3+N-CTS ] was characterized by UV-Vis and FT-IR spectra, X-ray diffraction ( XRD) pattern,TG and transmission electron microscope ( TEM) . The small amount of cobalt tet-rakis(p-sulphophenyl)porphyrin(1. 0 mg) in the supported catalyst could be reused 8 times under the optimal oxidation conditions of 140 ℃ and 0. 8 MPa. On average, it gave 17. 7% of ethyl-benzene conversion rate, 76. 4% of selectivity ( alcohol and ketone ) ,13. 5% of yields ( alcohol and ketone) and a catalyst turnover number of 3. 26×105. The results show that the chitosan can not only promote the catalysis of cobalt tetrakis( p-sulfophenyl) porphyrin for the ethylbenzene oxidation, but also enhance the recycling efficiency of catalyst, via graft and coordination immobilizatiion.
出处
《广西大学学报(自然科学版)》
CAS
北大核心
2014年第6期1385-1392,共8页
Journal of Guangxi University(Natural Science Edition)
基金
国家自然科学基金资助项目(No:51363001)
广西科技攻关项目(桂科攻12118008-12-3)
广西自然科学基金面上项目(2012GXNSFAA053016)
广西大学实验建设与实验教学改革项目基金资助(20120322)
关键词
四(p磺酸基苯基)钴卟啉
壳聚糖
氧化
乙苯
cobalt tetrakis( p-sulfophenyl) porphyrin
chitosan
oxidation
ethylbenzene