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Tailored ceramic catalyst support structures for heterogeneous catalytic reactions

用于多相催化反应的定制陶瓷催化剂载体结构

基本信息

批准号：
220242079
负责人：
Professor Dr. Alexander Michaelis
金额：
--
依托单位：
Professur für Anorganisch-Nichtmetallische Werkstoffe
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2012
资助国家：
德国
起止时间：
2011-12-31 至 2015-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/220242079?language=en
关键词：
Tailored ceramic catalyst support structures

项目摘要

The aim of the project is the development of tailored catalyst supports for application in microreactors. The internal as well as the external structure of this supports and thus the mass transfer and pressure drop properties can be adjusted by the applied preparation technique. Structures consisting of porous fibers and hollow fibers prepared by phase inversion spinning are highly suitable for this development goal. Application of this spinning technique allows tailoring of several structural parameters of the catalyst support to certain chemical reactions. The inner porosity of the fibers and their accessibility can be adjusted by influencing the parameters of the spinning process. The adjustment of internal diffusion resistances will be proven by measurements of the effective diffusion coefficients. Besides influencing the internal mass transfer properties the applied spinning process allows the adjustment of fiber diameter, fiber arrangement and void fraction within the preparation step of the three-dimensional structure. These structural properties are crucial for external mass transfer and pressure drop. For these properties of the fiber based catalyst support structures correlations will be developed within this project. Based on these correlations the trade-off between mass transfer and pressure drop can be tailored to a certain application. For the resulting >design guideline< especially the area of low Reynolds numbers is of crucial importance, because theoretical models predict a deterioration of mass transfer at this low Reynolds numbers. Because experimental validation of this models were not satisfactorily possible up to now, the comparison between model and experiment will be carried out within this project. The differential recycle reactor applied for catalytic measurements allows the estimation of mass transfer properties at low Reynolds numbers excluding the influence of axial diffusion effects due to the gradient free operation of the reactor. The extensively characterized fiber based catalyst support structures prepared within the scope of this project can be applied to various applications in microreactors.

该项目的目标是开发适用于微反应器的定制催化剂载体。该支撑体的内部和外部结构以及因此传质和压降特性可以通过所应用的制备技术来调整。由多孔纤维和中空纤维组成的相转化纺丝结构非常适合这一发展目标。这种纺丝技术的应用允许根据某些化学反应来调整催化剂载体的几个结构参数。通过影响纺丝工艺参数，可以调节纤维的内部孔隙率及其可及性。内扩散阻力的调节将通过测量有效扩散系数来证明。除了影响内部传质性能外，所采用的纺丝工艺还允许在三维结构的制备步骤中调整纤维直径、纤维排列和孔隙率。这些结构特性对外部传质和压降至关重要。对于基于纤维的催化剂载体结构的这些特性，将在该项目中进行关联。基于这些关联式，可以对传质和压降之间的权衡进行调整以适应特定的应用。对于由此产生的设计准则，尤其是低雷诺数区域是至关重要的，因为理论模型预测在这个低雷诺数时传质恶化。由于到目前为止，该模型的实验验证还不能令人满意，因此模型与实验的比较将在本项目中进行。用于催化测量的差动循环式反应器可以估算低雷诺数下的传质性能，而不考虑由于反应器无梯度操作而产生的轴向扩散效应的影响。在本项目范围内制备的广泛表征的纤维基催化剂载体结构可应用于微反应器的各种应用。