钴氧化物纳米催化剂的制备及对N_2O的分解

PREPARATION OF COBALT OXIDE NANOPARTICLES CATALYST AND ITS CATALYTIC ACTIVITY FOR THE N2O DECOMPOSITION REACTION

用微乳液法制备了表面经硬脂酸（ＳＴ）修饰的４种不同价态的钴氧化合物纳米微粒．初步摸索了合成的最佳条件，利用ＸＲＤ、ＴＥＭ、ＩＲ等测试手段对制备的钴纳米催化剂的物相、粒子的形貌和粒度及钴氧化物纳米微粒与表面活性剂有机基团间的结合方式进行了表征，结果表明制得的纳米微粒呈球状、粒度随热处理温度升高而增大，ＣＯＯ－与Ｃｏ（Ⅱ，Ⅲ）离子间以化学键相结合．利用流动法固定床反应器研究了钴氧化物纳米催化剂对Ｎ２Ｏ的催化分解活性，实验结果表明，在３５０℃焙烧制得的Ｃｏ２Ｏ３纳米粒子对Ｎ２Ｏ的催化分解有较好的催化活性．

The preparation of four kinds of cobalt(Ⅱ,Ⅲ) oxide nanoparticles catalyst which the surface were modified by stearic acid using microemulsion methods were reported. The most favorable experimental conditions for the preparation of nanoparticles were studied. The nanoparticles size, phase and the connect way between the nanoparticles and the steric acid were characterized using the TEM, FTIR, XRD. The experiments indicate that the nanoparticles take the shape of sphere and the nanoparticles' size increases with the calcite temperature. The connecting way between cobalt ion and the calcite bond. We also studied the catalytic activity of cobalt (Ⅱ,Ⅲ) oxide nanoparticles for N2O decomposition reaction using the fixed bed reactor of fluid method. The results show that the sample calcined on 350℃ has the best catalysis activity. 