摘要
制备了V取代的磷钼酸H_3+xPMo_(12-x)V_xO_(40)(x=0,1,2)及1-丁基-3-甲基咪唑溴盐离子液体([C4mim]Br),并采用离子交换的方法制备了系列杂化材料([C4mim]3+xPMo12-xVxO40,x=0,1,2);采用X射线衍射(XRD)、傅里叶变换红外光谱(FT-IR)、紫外-可见漫反射光谱(UV-Vis DRS)对所制备样品进行了表征;以H2O2为氧化剂,考察了所得样品催化苯羟基化制苯酚的活性。结果表明,和相应的离子液体及杂多酸相比,杂化材料的催化活性得到了很大的提高,尤其是催化剂[C4mim]5PMo10V2O40,在优化后的条件下,苯的转化率可达到21%,苯酚的选择性在99%以上。而且,该催化剂具有很好的可重复使用性,连续使用五次后,苯的转化率和苯酚的选择性没有明显降低。
Aseries of hybrid materials ([C4 mim]3+xPMo12-xVxO40, x = 0, 1,2) based on V-substituted phosphomolybdic acid H3.xPMO12-xVxO40 (x = 0, 1, 2) and ionic liquid 1-butyl-3-methyl imidazolium bromide ([C4mim]Br) have been prepared by an anion-exchange method. The samples were characterized by X-ray diffraction (XRD), Fourier transform infrared spectrophotometry (FT-IR) and UV-Vis diffuse reflectance spectra (UV-Vis DRS) analysis. The catalytic performances of the samples were tested in oxidation of benzene to produce phenol using H2O2 as the oxidant. The results showed that the hybrids [C4mim]3+xPMo,2-xVxO40 exhibit much higher catalytic properties than both the corresponding moieties. In particular, under the optimized conditions, 21% of benzene conversion and 99% selectivity for phenol have been obtained with [C4 mim]5PMo10V2O40. The sample also exhibits good reusability and was reused five times without a significant decrease in conversion and selectivity.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2016年第12期2961-2967,共7页
Acta Physico-Chimica Sinica
基金
国家自然科学基金(51302222
21363021
21202133)
教育部长江学者和创新团队发展计划(IRT15R56)
西北师范大学本科生学术能力提升计划项目资助~~
关键词
杂多酸
离子液体
杂化材料
苯羟基化
Polyoxometalate
Ionicliquid
Hybrid material
Hydroxylation of benzene