预处理条件对高浓度过氧化氢分解用银网催化剂初始活性的影响

Effect of Pretreatment Conditions on Initial Catalytic Activity of Silver Screen Catalyst for the Catalytic Decomposition of Highly Concentrated Hydrogen Peroxide

通过电镀法制备了用于催化分解高浓度过氧化氢的银网催化剂,采用过氧化氢预处理的方法对其初始催化性能进行了改进.结果表明,采用90%过氧化氢预处理可明显提高银网催化剂的初始活性,扫描电子显微镜和X射线光电子能谱表征结果显示90%过氧化氢预处理后的银网催化剂表面形成了大量1μm的沟壑并有Ag2O的生成,这是其性能提高的主要原因.

The silver screen catalyst used for the catalytic decomposition of highly concentrated hydrogen peroxide was plated on the nickel base. Pretreatment with hydrogen peroxide was employed to promote the initial catalytic activity of the catalyst. The results indicated that the initial activity and the start-up performance of the catalyst were greatly improved by the pretreatment with 90 % of hydrogen peroxide. The scanning electron microscopy and X-ray photoelectron spectroscopy results showed that a lot of fissures and active species of Ag2O appeared on the silver screen surface after the pretreatment. These probably are the main reasons for the improvement of the catalyst activity.