硅胶对氨气可再生吸附性机理的研究

Study on Renewable Adsorption Characteristics of Ammonia by Silica Gel

利用硅胶作为介孔材料利于脱附的性质,研究了其对有害气体NH3的吸附-脱附与再生性能,提出了硅胶吸附氨气的最佳操作条件,同时利用Materials Studio进行分子模拟探究了其可再生吸附的机理。研究结果表明:硅胶表面含有的硅羟基能与NH3形成氢键,且该氢键在VSA+吹扫作用下,可使NH3从硅胶表面脱附,而不改变硅羟基数量,实现可再生性,硅胶可作为NH3可再生吸附材料的候选物。

Using silica gel as a mesoporous material to facilitate desorption,the adsorption-desorption and regeneration performance of silica gel for harmful gas NH 3 was studied,and the optimal operating conditions for the adsorption of ammonia gas on silica gel were proposed.In addition,Materials Studio was used to conduct molecular simulation exploration the mechanism of its regenerable adsorption.The research results showed that the silanol groups contained on the surface of the silica gel could form hydrogen bonds with NH 3,and the hydrogen bonds can desorb NH 3 from the surface of the silica gel under the action of VSA+purging without changing the number of silanol groups,achieving reproducibility.It could be used as a candidate for NH 3 renewable adsorption material.