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将硅溶胶引入到微乳液中,成功地制备出负载型Ag/SiO2过氧化氢分解催化剂.此方法操作简单,分离容易,负载完全.制备的银纳米粒子粒径在10nm左右,银粒子在载体上分布均匀,聚集度低.采用紫外可见吸收光谱考察了催化剂的制备过程,发现硅溶胶与银纳米粒子之间存在一定的相互作用,这种相互作用可以促进微乳液中的银粒子在硅溶胶表面的吸附和沉积.过氧化氢催化分解实验显示,此方法制备的Ag/SiO2催化剂具有很高的催化活性,反应速率常数比同等条件下用浸渍法制备的催化剂高两个数量级.
The silica sol was introduced into the microemulsion and successfully prepared a supported Ag / SiO2 hydrogen peroxide decomposition catalyst, which has the advantages of simple operation, easy separation and complete loading. The prepared silver nano-particles have a particle size of about 10 nm, Uniform distribution, low degree of aggregation.The preparation process of the catalyst was investigated by UV-vis absorption spectroscopy and found that there is a certain interaction between the silica sol and the silver nanoparticles, this interaction can promote the silver particles in the microemulsion in the silica sol Adsorption and deposition of hydrogen peroxide on the surface of the catalyst were studied.Experimental results show that the catalyst prepared by this method has high catalytic activity and the reaction rate constant is two orders of magnitude higher than the catalyst prepared by the impregnation method under the same conditions.