溶胶粉末复合浸渍法制备颗粒状SCR脱硝催化剂的特性

针对以V₂O₅-WO₃/TiO₂为成分的颗粒状SCR脱硝催化剂在制备过程中存在的有效组分加载均匀性等问题，尝试了利用偏钛酸溶胶作为载体的催化剂生产方法.利用粉末/溶胶复合浸渍方式设计出4种催化剂的制备方法并分别制得样品.通过在不同温度条件下样品对烟气中NO_x成分去除效能的性能测试，以及进行相关的微观表征分析，研究比较了不同制备方式对催化剂特性的影响规律，旨在探索出一种合理、高效的催化剂制备工艺.结果表明:利用偏钛酸溶胶作为载体，同步浸渍加载WO₃和V₂O₅ 2种组分，相比传统的粉末浸渍和两步浸渍方式，该方法能够使浸渍组分在载体表面获得较高的覆盖率，并有效避免了浸渍组分溶出和重结晶现象的发生，所制得的催化剂样品具有较高的脱硝效率. 

Characteristics of SCR DeNOx Catalyst Powder from Sol/Powder-Complex Dipping Production Method

A V₂O₅-WO₃/TiO₂ SCR catalyst production method which uses the H₂TiO₃ sol was researched in this paper.The study aimed at solving the problem of uniformity of the catalyst powder in the production process.By introducing the complex impregnation method based on sol/powder mode,four types of catalyst production methods were devised,and the samples were prepared respectively.From tests on the DeNO_x performance of each catalyst on flue gas at different temperatures and analysis of the micro structure of each sample,the influences from different production methods on the characteristics of the catalysts were researched and compared,for the purpose of exploring an appropriate and efficient SCR catalyst production method.The study indicated that the catalyst sample made from dipping WO₃ and V₂O₅ on H₂TiO₃ sol simultaneously obtained a higher coverage rate of impregnated components on a TiO₂ carrier over traditional powder impregnation mode and two-step dipping mode.Moreover,this method avoided the dissolution and recrystallization efficiently happening in repeated impregnation.Also,the sample showed a higher DeNO_x efficiency.