Ag-Hollandite纳米线的合成及其催化氧化乙醇的性能

Facile Synthesis of Ag-Hollandite Nanofibers and Their Catalytic Activity for Ethanol Selective Oxidation

通过在硝酸溶液中373K回流AgMnO4和Mn(NO3)2的混合物制备了Ag-hollandite纳米线材料,并将其用于乙醇选择性氧化反应.X射线衍射谱表明所得材料的主要晶相为Ag-hollandite,但有少量的软锰矿形成.氮气吸附-脱附实验证实材料存在微孔结构.场发射扫描电镜和透射电镜观察表明纳米线长度为0.5～4.0μm,直径为10～20nm.Ag-hollandite纳米线是一种很有前途的乙醇选择性氧化制乙醛催化剂,503K时在120h的反应时间内,乙醇转化率为82%,乙醛选择性为95%.

Ag-hollandite nanofibers were synthesized by refluxing a mixture of AgMnO4 and Mn（NO3）2 in nitrate acid solution at 373 K and used for ethanol selective oxidation. The X-ray diffraction pattern showed that the main crystalline phase was Ag-hollandite, but a small amount of pyrolusite was also formed. The N2 adsorption-desorption isotherms confirmed the presence of a microporous structure. Field emission scanning electron microscopy and transmission electron microscopy showed that the lengths of the nanofibers were 0.5-4.0μm, and the diameters were 10 - 20 nm. The Ag-hollandite nanofibers gave a promising catalytic performance for ethanol selective oxidation to acetaldehyde, with an ethanol conversion of 82% and acetaldehyde selectivity of 95 % at 503 K for 120 h time-on-stream.