氨基酸功能化Dawson结构磷钨酸盐的制备及催化合成苯甲酸  

Preparation of mino acid functionalized Dawson type phosphotungstic acid and its catalytic performance for benzoic acid

作　　者：周德志[1] 叶志刚[1,2] 曹小华 占昌朝[1,2] 王珏 Zhou Dezhi;Ye Zhigang;Cao Xiaohua;Zhan Changchao;Wang Jue(College of Chemical and Environmental Engineering,Jiujiang University,Jiujiang Jiangxi 332005,China;Jiangxi Provincial Engineering Research Center of Ecological Chemical Industry,Jiujiang Jiangxi 332005,China)

机构地区：[1]九江学院化学与环境工程学院,江西九江332005 [2]江西省生态化工工程技术研究中心,江西九江332005

出　　处：《石油化工》2020年第2期113-118,共6页Petrochemical Technology

基　　金：国家自然科学基金项目(51562016,21864015);江西省自然科学基金项目(20171BAB206015)。

摘　　要：以Dawosn结构磷钨酸和L-精氨酸为原料制备了L-精氨酸功能化磷钨酸([Arg]3P2W18O62·nH2O)催化剂,采用EDS,FTIR,SEM,XRD,BET,TG等分析方法对制备的催化剂进行表征,考察了[Arg]3P2W18O62·nH2O催化苯甲醛氧化合成苯甲酸的催化性能,通过单因素实验优化了催化反应条件。实验结果表明,L-精氨酸功能化后磷钨酸仍保持Dawosn结构,但催化剂颗粒和孔体积增大,比表面积减少;优化反应条件为:n(苯甲醛)∶n(H2O2)=1∶5,w([Arg]3P2W18O62·nH2O)=1.4%(基于原料总质量),反应温度90℃,反应时间为3.0 h,在此条件下,苯甲酸平均收率为89.9%;催化剂重复使用5次后,苯甲酸收率仍可达80.4%。L-arginine functionalized phosphotungstic acid catalyst([Arg]3P2W18O62·nH2O)was prepared with the Dawson type phosphotungstic acid and L-arginine as raw materials.The catalyst was characterized by EDS,FTIR,SEM,XRD,BET and TG.Then its catalytic properties in oxidation of benzaldehyde to benzoic acid were investigated.The best reaction conditions were determined by single factor experiments.The results showed that phosphotungstic acid still remained Dawson structure after being functionalized with L-arginine.Compared with the Dawson type phosphotungstic acid,the average diameter and total pore volume of[Arg]3P2W18O62·nH2O increased,but the surface area of[Arg]3P2W18O62·nH2O decreased.Under the optimum reaction conditions of n(benzaldehyde)∶n(hydrogen peroxide)1∶5,w([Arg]3P2W18O62·nH2O)1.4%(base on the total mass of reactants),the reaction temperature 90℃,the reaction time 3.0 h,the average yield of benzoic acid was 89.9%.Catalyst could be reused for five times,and the yield of benzoic acid remained above 80.4%.

关 键 词：L-精氨酸 Dawson结构磷钨酸 苯甲醛 苯甲酸 

分 类 号：TQ426.91[化学工程]