Process design of ultrasonic spray pyrolysis synthesis of RuO2/TiO2 nanoparticles for catalytic applications

催化应用超声喷雾热解合成 RuO2/TiO2 纳米粒子的工艺设计

• 批准号: 123154985
• 负责人: Professor Dr.-Ing. Bernd Friedrich
• 金额: --
• 依托单位: Institut für Physikalische Chemie (IPC)
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2009
• 资助国家: 德国
• 起止时间: 2008-12-31 至 2012-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/123154985?language=en
• 关键词: Process; design; ultrasonic; spray; pyrolysis

Industrial chlorine processes produce large amounts of by-product, much more than the market can absorb, resulting in a toxic-waste disposal problem. In current processes chlorine is recovered from HCl in oxidation processes, where titanium electrodes coated with a layer of mixed oxides of titanium, ruthenium and/or other noble metals are used. The main target of this study in the frame of the DFG-SPP Program is to develop novel process designs for RuO2/TiO2 nanocatalysts with advanced properties. The rutile structure shall be reached in one step from aerosol droplets of a precursor solu-tion using the ultrasonic spray pyrolysis USP. Because of more simple preparation and possible high effectivity nanoparticles of transition metal oxide such as CuO, CoO, NiO will be investigated as new alternatives. Instead TiO2 as catalyst carrier the synthesis of Al2O3 from aluminium nitrate and alumin-ium chloride will be performed. The average droplet size in an aerosol formed ultrasonically depends mostly on the solution properties (viscosity, surface tension, concentration, density, rheology) as well as the ultrasound frequency. For a better control of droplet morphology and final powder properties the investigated process will be especially designed with respect to the synthesis of nanosized particles. In contrast to conventional processes, the synthesis of nanostructured particles by USP is a com-pletely new approach that offers better control of droplet morphology and final powder. A correspond-ing theoretical model: one droplet to one nanoparticle shall allow for efficient prediction of nanoparticle distribution, such existing ideas will be improved considering different characteristics of precursor. Us-ing a laser diffraction measurement of produced aerosol will allow in situ prediction of the final nanoparticle size.

工业氯处理过程产生大量的副产品，远远超过市场的吸收能力，导致有毒废物处理问题。在目前的工艺中，氯是在氧化过程中从HCl中回收的，在氧化过程中，钛电极上涂有一层钛、钌和/或其他贵金属的混合氧化物。在DFG-SPP项目框架下，本研究的主要目标是开发具有先进性能的RuO2/TiO2纳米催化剂的新工艺设计。使用超声波喷雾热解USP，从前驱体溶液的气溶胶液滴一步即可达到金红石结构。由于CuO、CoO、NiO等过渡金属氧化物的制备更简单，并且可能具有高效的纳米颗粒，因此作为新的替代品将被研究。以TiO2为催化剂载体，以硝酸铝和氯化铝为原料合成Al2O3。超声波形成的气溶胶中的平均液滴大小主要取决于溶液的性质（粘度、表面张力、浓度、密度、流变性）以及超声波频率。为了更好地控制液滴的形态和最终的粉末性能，所研究的工艺将特别针对纳米颗粒的合成进行设计。与传统工艺相比，USP合成纳米结构颗粒是一种全新的方法，可以更好地控制液滴形态和最终粉末。相应的理论模型：一个液滴到一个纳米颗粒应该可以有效地预测纳米颗粒的分布，考虑到前驱体的不同特性，这种现有的想法将得到改进。使用激光衍射测量产生的气溶胶将允许在现场预测最终的纳米颗粒大小。