不锈钢丝网上Cu基催化剂的制备及反应性能

Preparation and Performance of Cu Based Catalyst on Stainless Steel Wire Mesh

采用阳极氧化技术在不锈钢丝网上成功地自生长了结构致密的氧化物膜,并以此为载体,通过电化学沉积工艺制备了Cu/不锈钢丝网催化剂。以甲苯、丙酮、乙酸乙酯及二氯甲烷为模型反应,考察了4种不同种类挥发性有机化合物(VOCs)在该催化剂上的完全氧化活性。结果表明电化学沉积时间为15 min制备得到的催化剂上完全氧化丙酮、甲苯、乙酸乙酯及二氯甲烷的温度分别为240、220、260和440℃。在220℃反应条件下进行60 h的甲苯氧化稳定性试验结果显示该催化剂催化氧化甲苯的转化率一直保持98%以上,表现出较好的稳定性。扫描电镜,X射线衍射及X射线光电子能谱等表征结果表明,不锈钢丝网载体表面的阳极氧化物膜有利于提高活性组分的分散度。设计采用电沉积工艺大大提高了催化剂表面活性物种与载体的结合牢固度。

Anodic oxidation technology was adopted to form ordered oxides film on the surface of stainless steel wire mesh.On the basis of the pretreatment for the catalyst support above,Cu/stainless steel wire mesh catalyst was prepared via electrochemical deposition method.Four kinds of VOCs were used to investigate the oxidation activity of the catalyst.In the presence of the catalyst prepared under 15 min electrochemical deposition,the temperature for the complete oxidation of acetone,toluene,ethyl acetate and methylene dichloride was 240,220,260 and 440 ℃,respectively.The stability test results at 220 ℃ for 60 h show that the catalyst is with good stability and the conversion of toluene is kept above 98%.The catalyst was characterized by scanning electron microscopy,X-ray diffraction,X-ray photoelectron spectroscopy.The characterization results indicate that the oxides film is favorable for the dispersion of active components,and the design of electrochemical deposition method makes well combination for the active components and the support.