摘要
甲苯选择性氧化制备苯甲酸是小分子有机化学中重要的反应,是廉价芳香烃提高附加值的最有效途径之一.以同一比例的反应物为原料,在4种不同温度的条件下,考察温度对于催化剂形成的影响,并以甲苯液相选择性催化氧化生成苯甲酸为探针反应.采用X射线衍射(XRD)、扫描电镜(SEM)、BET比表面积、程序升温还原(H_2-TPR)等表征手段对所得锰氧化物进行表征,分析其催化能力差异的原因.最后在温和的回流反应体系下,80℃合成的锰氧化物表现出较好催化性能和优异的目标产物选择性.在优化反应条件下,甲苯的转化率达到44.67%,目标产物苯甲酸的选择性达到79.18%.
Selective oxidation of toluene to benzoic acid is an important reaction in small molecular organic chemical, which is a most efficient method for increasing addition value of cheap aromatic hydrocarbon. In four different temperatures, some reactants with same proportion are taken as the raw material, investigating the effect of temperature on catalyst forming. The selective catalytic oxidation of benzoic acid and toluene in liquid phase as the probe reaction, and obtaining manganese oxides are characterized by XRD, SEM, BET, H_2-TPR. According to results of characterization, the reasons of difference catalytic performance have been resolved. In reflux reaction system with mild reaction conditions, finally, the manganese oxides by 80 ℃ synthesizing obtain good catalytic performance and excellent selectivity of target product. It is shown that the toluene conversion is 44.67% and selectivity of benzoic acid is 79.18% in optimal reaction conditions.
出处
《广东工业大学学报》
CAS
2017年第5期96-102,共7页
Journal of Guangdong University of Technology
基金
国家自然科学基金资助项目(21576054)
关键词
锰氧化物
甲苯
回流反应体系
苯甲酸
manganese oxides
toluene
reflux reaction system
benzoic acid
