A novel method to determine the adsorption of water vapor on porous solids and supported ionic liquids by electrical sensors

一种通过电传感器测定多孔固体和负载离子液体上水蒸气吸附的新方法

• 批准号: 274325164
• 负责人: Professor Dr.-Ing. Andreas Jess
• 金额: --
• 依托单位: Lehrstuhl für Chemische Verfahrenstechnik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2015
• 资助国家: 德国
• 起止时间: 2014-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/274325164?language=en
• 关键词: novel; method; determine; adsorption; water

The thermal stability of ionic liquids with regard to evaporation and decomposition is important for the application of pure and supported ionic liquids (ILs). In the course of the soon-finished joint DFG-projects of both PIs, electrical sensors have been successfully developed to detect the pore filling degree of ionic liquids by a radio frequency-based (RF-based) method. By means of this method, the mass loss by evaporation and thermal decomposition can be measured. This was also possible in operando during the selective hydrogenation of butadiene to butene on a Pd-SCILL-catalyst (solid catalyst with ionic liquid layer).Within the applied new research project, which is a continuation of the first project, the promising RF-method shall now be transferred to measure in operando the adsorption of water vapor on porous solids and ionic liquids supported on porous solids. This is in general important for drying of gases by adsorption as well as for the use of supported ionic liquids in catalysis. If possible, the adsorption process should be monitored space-resolved in axial direction in an adsorber (fixed bed).Very preliminary experiments show that the ad- and desorption of water vapor can be measured by the radio frequency-based method both for pure porous solids as well as for porous solids coated with an IL. The ultimate goal of the proposed project is the development of a new electrical method to determine the water load of adsorption agents contact-free, in operando, and space-resolved. Pure porous silica as well as silica coated with an IL will be investigated. In the latter case, the simultaneous determination of the water load and the pore filling degree with the ionic liquid is also a goal of the project. Finally, the results of these investigations should also be applied to determine the influence of water (vapor) on the activity and selectivity of a SCILL-catalyst, namely the IL [DMIM][DMP] supported on silica with palladium as active metal. As a model reaction, the selective hydrogenation of butadiene to butene should again be used.At the end of the project, a model should have been developed that allows to quantitatively explain the radio frequency signals as a function of the input parameters (exposure of water, temperature) and that derives the water load spatially resolved from the RF signals.

离子液体在蒸发和分解方面的热稳定性对于纯离子液体和负载型离子液体 (IL) 的应用非常重要。在两个PI即将完成的联合DFG项目过程中，已成功开发出电传感器，用于通过基于射频（RF-based）的方法检测离子液体的孔隙填充程度。通过该方法，可以测量蒸发和热分解造成的质量损失。这在 Pd-SCILL 催化剂（具有离子液体层的固体催化剂）上将丁二烯选择性加氢为丁烯的过程中也是可能的。在作为第一个项目的延续的新应用研究项目中，有前景的 RF 方法现在应转移到测量多孔固体和支撑在多孔固体上的离子液体上的水蒸气吸附。这对于通过吸附干燥气体以及在催化中使用负载型离子液体来说通常很重要。如果可能，应在吸附器（固定床）中沿轴向空间分辨监测吸附过程。非常初步的实验表明，对于纯多孔固体以及涂有离子液体的多孔固体，可以通过基于射频的方法测量水蒸气的吸附和解吸。该项目的最终目标是开发一种新的电学方法，以非接触式、操作式和空间解析的方式确定吸附剂的水负荷。将研究纯多孔二氧化硅以及涂有离子液体的二氧化硅。在后一种情况下，同时测定水负荷和离子液体的孔隙填充程度也是该项目的目标。最后，这些研究的结果还应应用于确定水（蒸气）对 SCILL 催化剂（即以钯作为活性金属负载在二氧化硅上的 IL [DMIM][DMP]）的活性和选择性的影响。作为模型反应，应再次使用丁二烯选择性氢化为丁烯。在项目结束时，应开发出一个模型，该模型可以定量解释射频信号作为输入参数（水的暴露、温度）的函数，并从射频信号中导出空间解析的水负荷。