论文部分内容阅读
采用胶体晶体模板方法,通过调控聚苯乙烯(PS)微球粒径和前驱体浓度制备了孔径由0.48μm至1.65μm连续可调的Au@Al_2O_3三维有序大孔(3DOM)复合材料。利用扫描电子显微镜(SEM)、X射线衍射(XRD)和紫外-可见分光光度计(UV-Vis)等手段考察了样品的表面形貌和催化特性。发现Au@Al_2O_3 3DOM复合材料具有优异的催化性能。随着孔径增大,其催化性能表现出先上升后下降的变化规律,且在孔径为1.27μm时达到最高。结合理论分析表明,随着Au@Al_2O_3 3DOM复合材料微观结构的变化,其有效活性面积和孔道传输效率也随之改变,二者的共同作用是Au@Al_2O_3 3DOM复合材料催化性能变化规律的物理本质。
The Au @ Al_2O_3 3DOM (macroporous) composite with adjustable pore size from 0.48μm to 1.65μm was prepared by controlling the particle size and precursor concentration of polystyrene (PS) microspheres by the colloidal crystal template method. The surface morphology and catalytic properties of the samples were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD) and ultraviolet-visible spectrophotometer (UV-Vis) Au @ Al_2O_3 3DOM composites were found to possess excellent catalytic performance. With the increase of pore size, the catalytic properties showed the first increase and then decrease, and reached the highest when the pore diameter was 1.27μm. The theoretical analysis shows that with the change of the microstructure of the Au @ Al_2O_3 3DOM composite, the effective active area and pore transport efficiency also change. The combined effect of the two is the physical nature of the catalytic properties of Au @ Al_2O_3 3DOM composites .